
    Patricia A. WILLS, individually and as personal representative of the Estate of Ricky Lee Wills, deceased, on behalf of Ricky Lee Wills and those persons similarly situated, Plaintiff-Appellant, v. AMERADA HESS CORP., Spentonbush/Red Star Companies, Inc., Sheridan Transportation Corp. and Hygrade Operators Inc., Defendants-Appellees.
    Docket No. 02-7913.
    United States Court of Appeals, Second Circuit.
    Argued: Aug. 7, 2003.
    Decided: Aug. 11, 2004.
    
      Kenneth Heller, Kenneth Heller P.C., New York, New York, for Plaintiff-Appellant.
    Robert J. Kelly, Wilson, Elser, Moskow-itz, Edelman & Dicker, LLP, Newark, NJ, (James M. Hazen, Hill, Betts & Nash LLP, New York, New York, of counsel), for Defendants-Appellees.
    Before: JACOBS and SOTOMAYOR, Circuit Judges.
    
    
      
       The Honorable Fred I. Parker, who was a member of the panel, died following argument. This appeal is being decided by the remaining two members of the panel, who are in agreement. See 2d Cir. R. § 0.14(b).
    
   SOTOMAYOR, Circuit Judge.

Plaintiff-appellant Patricia A. Wills (“Wills” or “plaintiff’) seeks damages under the Jones Act, 46 U.S.C. § 688(a), general maritime law, and New York state law for losses related to the 1996 death of her husband, Ricky Lee Wills (“decedent”), from cancer complications. Wills alleges that decedent’s illness and death are attributable to his exposure to hazardous chemicals while working aboard ships owned and operated by defendants-appellees Amerada Hess Corporation, Spenton-Bush/Red Star Companies, Inc., Sheridan Transportation Corporation, and Hygrade Operators, Inc. (collectively “defendants”). The district court granted summary judgment in favor of defendants upon concluding that Wills failed to proffer sufficient admissible evidence of causation. See Wills v. Amerada Hess Corp., No. 98 CIV. 7126(RPP), 2002 WL 140542, at *17 (S.D.N.Y. Jan.31, 2002).

On appeal, Wills argues that the district court erred in holding that the burden of proof as to causation rested with her, and that the district court abused its discretion in excluding her proposed experts’ testimony on the issue of causation. Specifically, Wills contends that because her suit was brought under the Jones Act, the burden-shifting rule prescribed by The Pennsylvania, 86 U.S. (19 Wall.) 125, 22 L.Ed. 148 (1873) (“The Pennsylvania Rule” or “the Rule”), should apply, and the standards of reliability to which expert testimony is held under Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579, 113 S.Ct. 2786, 125 L.Ed.2d 469 (1993), should be relaxed. For the reasons discussed below, we disagree with both contentions and affirm the district court’s judgment granting defendants summary judgment on Wills’s claims.

BACKGROUND

From 1985 to 1995, decedent served as a seaman aboard vessels owned or operated by defendants. These vessels transported petroleum-based fuels such as crude oil, jet fuel, kerosene, and gasoline. In December 1995, roughly four months after leaving defendants’ employ, decedent was diagnosed with squamous cell carcinoma. Although he underwent an aggressive treatment regime, the cancer progressed. He died on October 2, 1996, at the age of thirty-nine.

Decedent’s wife and executrix of his estate, Patricia A. Wills, filed this suit in October 1998, alleging that decedent’s cancer was due, in part, to his harmful exposure to benzene and polycyclic aromatic hydrocarbons (“PAHs”) while working aboard defendants’ vessels. Her complaint raised claims of wrongful death, unseaworthiness, and maintenance and cure under general maritime law, negligence and loss of consortium under New York state law, and negligence and wrongful death under the Jones Act. Pursuant to a schedule set by the district court, discovery was to be completed by August 31, 1999, and trial was to begin in September of that year.

For purposes of this appeal, we summarize only those aspects of the protracted discovery process that relate to Wills’s proposed experts. Defendants first sought to identify Wills’s experts and the nature of the experts’ anticipated testimony through interrogatories, propounded on April 21, 1999. Wills moved to strike the interrogatories. The district court denied her motion and ordered Wills to respond by May 25, 1999. In late August 1999, Wills disclosed the names of three proposed expert witnesses: Jesse H. Bidan-set, Ph.D., a forensic toxicologist; Cynthia W. Duffield, a civil engineer; and Richard C. Rodi, an engineer and basic ship design manager. Instead of scientific reports describing the nature of the experts’ research and detailed descriptions of their anticipated testimony, Wills provided defendants with only superficial descriptions of the experts’ intended testimony. The district court ordered Wills to produce more detailed expert reports by November 1,1999.

At a November 4, 1999 hearing, the district court, in response to defendants’ assertion that there was no proven link between benzene exposure and squamous cell carcinoma, ordered Wills to provide, within two weeks, a scientific report establishing such a causal link. On November 19, 1999, Wills produced a “preliminary report” authored by Dr. Bidanset (the “First Report”), which concluded “with reasonable scientific certainty that [decedent’s] occupational exposure to various petroleum products was the most probable cause of his squamous cell carcinoma.” The brevity of the First Report, and, inter alia, its failure to cite sufficient scientific evidence to support its conclusion, prompted the district court to continue its December 6, 1999 order staying further discovery until Dr. Bidanset could be deposed and the admissibility of his testimony determined. Wills v. Amerada Hess Corp., No. 98 CIV. 7126(RPP), 2000 WL 42201, at *3 (S.D.N.Y. Jan.19, 2000).

On April 28, 2000, Wills provided defendants with another report from Dr. Bidan-set (the “Second Report”), and Dr. Bidan-set’s deposition was taken later that year. In the Second Report, Dr. Bidanset also advanced the “oncogene theory” of causation — a theory which, by his own admission, is “controversial.” Wills, 2002 WL 140542, at *14. The more widely-accepted scientific theory of causation — the so-called “dose-response” theory — suggests that toxins are only carcinogenic when a person is exposed to concentrations over and above a specified threshold level. Below the specified threshold level, the effects of the toxins are thought to be benign. In contrast, Dr. Bidanset’s oncogene theory suggests that for some toxins there is no safe level of exposure because the cancer can be triggered by the interaction of a single molecule of the toxin with a single human cell. Dr. Bidanset surmised that decedent’s cancer had developed in the manner predicted by the oncogene theory.

On January 2, 2001, appellees moved to exclude Dr. Bidanset’s testimony, and for summary judgment on all claims. In response, Wills moved to apply The Pennsylvania Rule to her claims, thereby shifting the burden of proof on the issue of causation to appellees. Further, Wills submitted two additional expert reports — from Dr. Alfred Neugut, an oncologist and epidemiologist, and Paul Haas, an industrial hygienist — with her response papers. The district court refused to consider these additional expert reports, excluding them as untimely. (Order of Feb. 26, 2001).

In an opinion and order dated January 31, 2002, the district court granted defendants’ motion to exclude the proposed testimony and reports of Dr. Bidanset, finding them to be without sufficient indicia of reliability as required for admissibility under Rule 702 of the Federal Rules of Evidence (“Rule 702”). Wills, 2002 WL 140542, at *13-15. First, the district court rejected Wills’s contention that the standards for admissibility under Daubert are relaxed in cases brought under the Jones Act. Id. at *9. Second, applying Daubert’s non-exhaustive list of factors to be considered when admitting evidence under Rule 702, the district court found Dr. Bidanset’s opinions insufficiently reliable to be admissible under Rule 702. Id. at *15. Specifically, the district court found that Dr. Bidanset’s First Report — which the district court deemed devoid of scientific evidence linking squamous cell carcinoma to exposure to benzene and PAHs, the toxins to which decedent allegedly was exposed— “demonstrate^ that Dr. Bidanset was ready to form a conclusion first, without any basis, and then try to justify it.” Id. at *10. Further, the district court noted that Dr. Bidanset conceded in his deposition that he was unaware of any scientific studies that would support his contention, made in the First Report, that the “aggressiveness” of decedent’s cancer demonstrates that he was “intensely exposed to ... carcinogenic hydrocarbons.” Id.

With regard to the Second Report, the district court was skeptical of Dr. Bidan-set’s assumption that decedent was exposed to benzene, PAHs, and diesel exhaust emissions — an assumption that Dr. Bidenset based largely on the fact that the vessels on which decedent worked were powered by diesel engines and carried petroleum products. Although Dr. Bidanset was able to document that, on at least some of the defendants’ vessels, benzene emissions occasionally exceeded levels permitted by the Occupational Safety and Health Administration (“OSHA”), the district court found no evidence that decedent worked on any of those particular vessels at the times when such high levels were recorded. Id. at *10. Dr. Bidanset also relied on the affidavit of another seaman, Mark Miller, who, for a period of five months, intermittently worked with decedent aboard defendants’ ships. Miller averred that both he and decedent were exposed to noxious odors, but the district court discounted the value of such statements on the ground that Miller lacked the expertise necessary to determine the toxicity of the fumes. Id. at *11.

Next, the district court considered the scientific studies upon which Dr. Bidanset relied, all of which involved animal, rather than human subjects. The district court noted that Dr. Bidanset failed to establish a link between benzene and PAH exposure and squamous cell carcinoma. Id. at *11-12. The court further noted that, by Dr. Bidanset’s own admission, the cancer most linked to benzene exposure is leukemia. Id. at *12. The district court observed that, in failing to establish a nexus between benzene and PAH exposure and decedent’s cancer, Dr. Bidanset indicated that “he is not even sure whether benzene is capable of causing Decedent’s [squamous cell carcinoma].” Id. at *12.

Observing that courts should be cautious in presuming that findings derived from animal studies are applicable to humans, the district court nevertheless scrutinized the animal studies which purportedly established a link between benzene and squamous cell carcinoma. The district court observed that in studies in which mice inhaled the toxin, the causal link between benzene and squamous cell carcinoma was only tenuous. Id. Although such a link was stronger in studies in which rats ingested large quantities of benzene, the district court doubted the pertinence of those studies because there was no suggestion that decedent ingested benzene, let alone at such high doses or for comparable durations. Id.

The district court also expressed dissatisfaction with Dr. Bidanset’s failure to account adequately for the possibility that decedent’s cigarette smoking and alcohol consumption caused his squamous cell carcinoma. Id. Although Dr. Bidanset conceded that smoking is the most frequent cause of squamous cell carcinoma, the Second Report summarily discounted the fact that decedent smoked between one and two packs per day for over twenty years. According to Dr. Bidanset, smoking was not likely the cause of decedent’s cancer, because it usually takes decades for cigarette smoking to cause squamous cell carcinoma, and the cancer is then usually found in the lungs rather than the head and neck. The district court, however, found that this statement contradicted a study that Dr. Bidanset relied upon in the First Report, which concluded that smoking is a major risk factor for squamous cell carcinoma of the head and neck. Id. The study further concluded that the latency period for developing squamous cell carcinoma was eight years, rather than decades, as Dr. Bidanset contended. Id. The district court also faulted the Second Report for not accounting for the possibility that decedent’s heavy drinking may have caused his squamous cell carcinoma, even though the First Report specifically stated that alcohol is a major risk factor for squamous cell carcinoma. Id.

Regarding the Second Report, the district court held that Dr. Bidanset’s oncogene theory failed all of the Daubert factors, as it had not been tested or subjected to peer review, and consequently, there was no known potential error rate. Id. at *13-16. Further, the district court found that Dr. Bidanset’s reasons for departing from the mainstream understanding of causation to embrace the oncogene theory were wholly unsatisfactory; Id. at *14-16. Dr. Bidanset could cite to no epidemiological studies pointing to an increased risk of squamous cell carcinoma in those exposed to benzene or PAHs, and he conceded in his deposition that he was unsure whether PAHs conform to the oncogene theory at all. The district court also determined that Dr. Bidanset’s conclusion that exposure to diesel fuel contributed to decedent’s cancer was made without any basis. Id. at *15.

On the basis of these deficiencies, the district court granted defendants’ motion to exclude Dr. Bidanset’s expert testimony and opinions. Id. Wills nonetheless argued that, even if such evidence were excluded, the defendants’ motion for summary judgment should be denied because, under The Pennsylvania Rule, defendants bore the burden of proof on the issue of causation. The district court declined to apply The Pennsylvania Rule and refused to shift the burden of proof to defendants. Id. at *16-17. Relying chiefly on this Court’s decision in Wilkins v. American Export Isbrandtsen Lines, Inc., 446 F.2d 480 (2d Cir.1971), in which we declined to invoke the Rule where a seaman died from a heart attack after working more hours than statutorily allowed, the district court held that The Pennsylvania Rule “should not be extended ‘beyond the chosen area of ship collisions to embrace Jones Act cases.’ ” Wills, 2002 WL 140542, at *16 (quoting Wilkins, 446 F.2d at 486).

On Wills’s claim for maintenance and cure, the district court found that, in addition to a failure of proof on the issue of causation, Wills had proffered insufficient evidence to establish that decedent’s illness manifested itself during his employment with defendants. Id. at *17.

Finding Wills without evidence on the issue of causation, an issue that the district court regarded as essential for her to prevail, the district court provisionally granted summary judgment in favor of defendants. Id. Sensitive to Wills’s claim that her case had been stymied by her inability to obtain full discovery, the district court permitted Wills an additional twenty days to submit an affidavit detailing the evidence sought' through further discovery and the manner in which such evidence would assist her in proving causation. Id. In response, Wills requested an opportunity to depose all of defendants’ operating personnel and review a host of documents pertaining to the design and cargo of defendants’ vessels. She also requested permission to conduct environmental and air quality tests aboard defendants’ vessels.

After considering Wills’s request, the district court declined to re-open discovery. Wills, 2002 WL 1482624, at *4. According to the district court, Wills did not explain how an opportunity to depose all of defendants’ employees would allow her to remedy the deficiencies identified in Dr. Bidanset’s testimony. Id. at *1. As to the documentary evidence sought, the district court concluded that defendants either had complied with Wills’s requests for such materials or that Wills previously had been given sufficient access to such records. Id. at *4. The district court was also unpersuaded by Wills’s requests to conduct air quality tests on defendants’ vessels, because it doubted that the results of such tests — conducted more than seven years after decedent’s death — would be probative on the issue of his exposure to toxins. Id. For the reasons stated in its prior order and opinion, the district court granted summary judgment to defendants on all claims.

Wills timely filed this appeal.

DISCUSSION

We must first determine whether the district court correctly held that Wills bears the burden of proof on the issue of causation and that The Pennsylvania Rule was inapplicable to her claims. Because we answer those questions affirmatively, we then determine whether the court was correct in finding that Wills did not satisfy her burden to prove causation and in granting summary judgment to defendants on that basis. We also answer those questions affirmatively and hold that: (1) expert testimony on the issue of causation is necessary in Jones Act cases where a lay juror could not be expected to intuit the causal relationship between the acts in question and the injury; (2) such expert testimony must satisfy the Daubert standards of reliability to be admissible under Rule 702; (3) the district court did not abuse its discretion in concluding that Wills’s proffered expert testimony either did not meet those standards’ or was untimely; and (4) the district court’s stay of discovery pending a determination of the admissibility of Wills’s expert’s testimony was not an abuse of discretion.

Lastly, because Wills has not established that decedent’s illness manifested itself while he was in defendants’ employ, or that decedent’s illness was causally related to exposure to toxic emissions while aboard defendants’ ships, her claim for maintenance and cure also fails.

I. Standards of Review

We review the district court’s grant of summary judgment de novo. See Lombard v. Booz-Allen & Hamilton, Inc., 280 F.3d 209, 214 (2d Cir.2002). Summary judgment is appropriate where there are no genuine issues of material fact and the moving party is entitled to judgment as a matter of law. Fed.R.Civ.P. 56; Oneida Indian Nation v. City of Sherrill, 337 F.3d 139, 152-53 (2d Cir.2003). When there are no disputed issues of material fact, “our task is to determine whether the district court correctly applied the law.” Mario v. P & C Food Mkts., Inc., 313 F.3d 758, 763 (2d Cir.2002) (internal quotation marks omitted).

We review a district court’s decision to exclude expert testimony for abuse of discretion. Kumho Tire Co. v. Carmichael, 526 U.S. 137, 152, 119 S.Ct. 1167, 143 L.Ed.2d 238 (1999). The exclusion of a proposed expert witness will not constitute an abuse of discretion unless it is “manifestly erroneous.” Amorgianos v. Nat’l R.R. Passenger Corp., 303 F.3d 256, 265 (2d Cir.2002) (internal quotation marks omitted). We have held that “the abuse of discretion standard applies as much to the trial court’s decisions about how to determine reliability as to its ultimate conclusion.” Id. (emphasis in original) (internal quotation marks omitted). Accordingly, “the district court has broad discretion in determining what method is appropriate for evaluating [the] reliability [of proposed expert evidence] under the circumstances of each case.” Id.

Recognizing the district court’s broad discretion to direct and manage the pre-trial discovery process, we also review a district court’s discovery rulings for abuse of discretion. In re Fitch, Inc., 330 F.3d 104, 108 (2d Cir.2003).

II. Application of The Pennsylvania Rule

“[B]ecause of their status as wards of the admiralty, [seamen] are by the peculiarity of their lives liable to sudden sickness from change of climate, exposure to perils, and exhausting labour.” O’Hara v. Weeks Marine, Inc., 294 F.3d 55, 62 (2d Cir.2002) (internal quotation marks omitted); see Chandris, Inc. v. Latsis, 515 U.S. 347, 354-55, 115 S.Ct. 2172, 132 L.Ed.2d 314 (1995). The Jones Act, 46 App. U.S.C. § 688, provides seamen with special statutory protections in the area of personal injury suits: “Any seaman who shall suffer personal injury in the course of his employment may” bring a cause of action against his employer. Id. at § 688(a). The Act therefore “places a ... duty on the [shipowner] to provide a reasonably safe workplace.” Oxley v. City of New York, 923 F.2d 22, 25 (2d Cir.1991). Wills argues that defendants breached this duty by exposing her husband to carcinogenic chemicals.

Wills contends that defendants’ motion for summary judgment was improperly granted because, upon showing that defendants breached their regulatory obligation to protect decedent from exposure to toxins, The Pennsylvania Rule applies and relieves her of the burden of proving causation altogether. The Pennsylvania Rule, an oddity of admiralty law, shifts the burden of proving causation from plaintiffs to defendants to “show[] not merely that [their] fault might not have been one of the causes [of the injury], or that it probably was not, but that it could not have been.” The Pennsylvania, 86 U.S. (19 Wall.) at 136. Wills asserts that she can prove that defendants violated various coast guard regulations requiring shipowners to monitor benzene emissions, see 46 C.F.R. §§ 197.505, 197.515, 197.540, and that proof of such violations warrants application of The Pennsylvania Rule’s presumption that these violations caused her husband’s cancer.

By shifting the burden of proof to establish causation, The Pennsylvania Rule creates a “drastic and unusual presumption”—-albeit a rebuttable one— against the shipowner who has violated his or her legal duties. Dir. Gen. of India Supply Mission v. S.S. Maru, 459 F.2d 1370, 1375 (2d Cir.1972) (quoting G. Gilmore & C. Black, The Law of Admiralty § 7-5, at 404 (1957)). Nevertheless, such a presumption is appropriate in cases where, in light of “wide experience in maritime navigation,” “[t]he logical probability” is “that [the] fault of the ship is the cause” of the disaster. Wilkins v. Am. Exp. Isbrandtsen Lines, Inc., 446 F.2d 480, 485 (2d Cir.1971).

Collision cases, such as the case that gave the Rule its moniker, most clearly illustrate this principle. Because a collision “is rare in which there is not at least some arguable reason for regarding both vessels at fault,” id. (internal quotations marks and citation omitted), it is logical to attribute fault to “a ship [that] at the time of a collision is in actual violation of a statutory rule intended to prevent collisions.” The Pennsylvania, 86 U.S. (19 Wall.) at 136 (imposing presumption against sailboat, which, lacking a required foghorn, collided with a speeding steamer). Thus under the Rule, proof that a maritime safety rule was violated creates a presumption that the violation led to the collision, such that the complaining party is relieved of its obligation to show causation, unless the derelict shipowner can prove that the violation was not the cause of the collision.

Wills correctly notes that application of The Pennsylvania Rule has not been limited to cases involving collisions. See, e.g., Complaint of Tug Helen B. Moran, Inc., 560 F.2d 527, 529 (2d Cir.1977) (applying the Rule in the context of allision); The Aakre, 122 F.2d 469, 474-75 (2d Cir.1941) (applying the Rule in the context of ship stranding). Nevertheless, we have been cautious not to extend the Rule’s application in ways that would unmoor it from its animating principles. Thus, for example, we have held that application of The Pennsylvania Rule is “limited to the violation of a statute intended to prevent the catastrophe which actually transpired.” India Supply Mission, 459 F.2d at 1375. Accordingly, we have applied the Rule against a ship overloaded in violation of the Load Line Act, 46 App. U.S.C. §§ 85(b) and (c), that sank at sea. See Petition of Long, 439 F.2d 109, 113 (2d Cir.1971). We declined, however, to apply the Rule against an unlawfully overloaded ship that became stranded in shallow water. India Sttpply Mission, 459 F.2d at 1374-75. In distinguishing the two scenarios, we noted that Congress’s “prime motivation” in enacting the Load Line Act was to prevent loss of life due to overloaded vessels sinking. Id. at 1375-76. Absent such a limiting principle, “every violation of every statute would call into play the Pennsylvania rule irrespective of the purpose of the statute and the danger which it was intended to prevent.” Id. at 1376.

Wills argues that this limitation is satisfied here, because defendants are alleged to have violated coast guard regulations that were enacted for the express purpose of preventing seamen from developing cancer from exposure to toxic emissions while at sea. See 56 Fed. Regulation. 52122-01 (Oct. 17,1991) (stating that coast guard regulation, 46 C.F.R. § 197, “incorporate[d] the lower benzene exposure levels adopted by [OSHA]” which is “expected to result in a 90% lowering of leukemia deaths associated with the inhalation of benzene vapors”). Even assuming arguendo that Wills is correct that her husband’s cancer was within the scope of harms that these coast guard regulations were intended to prevent, we agree with the district court that the circumstances of this case do not warrant application of The Pennsylvania Rule.

In addition to requiring a nexus between the injury and the purpose of the legal obligation that was breached, our cases hold that The Pennsylvania Rule will not create a presumption that the law’s violation caused a calamity unless common sense or the realities of admiralty prompt that conclusion. In The Mabel, 35 F.2d 731 (2d Cir.1929) (per curiam), for example, we refused to impose The Pennsylvania Rule against an anchored ship that was struck by a barge at night, despite the barge owner’s argument that the collision could have been avoided had the anchored ship complied with its legal obligation to hang cautionary lights at a sufficient distance from one another. Id. at 732. While “[a]ll things are indeed possible,” we observed that “in applying {The Pennsyl vania Rule] we are limited to the reasonable probabilities.” Id. Finding it improbable that the anchored ship’s failure to comply with the regulation was the cause of the collision, the bargeowner’s application to invoke The Pennsylvania Rule was denied.

Over fifty years later, in Wilkins, similar reasoning led us to reject application of The Pennsylvania Rule in a Jones Act case. There, a seaman suffered a fatal heart attack after being required to work strenuous amounts of overtime. The seaman’s estate sued the seaman’s employer under the Jones Act, arguing that by forcing the seaman to work so hard, the employer was responsible for the seaman’s death. Id. at 481. The estate claimed that The Pennsylvania Rule was applicable because the employer violated a safety statute that limited seaman overtime. Id. at 485. While recognizing that the seaman’s overtime work “was not so devoid of probative value as to forbid an inference that it caused his heart attack,” we also found that the nexus between the violation of the statute and the seaman’s heart attack was not so self-evident as to warrant the presumption that violation of the overtime statute resulted in the seaman’s death. Id. at 484-85. Accordingly, we held that The Pennsylvania Rule does not apply where proof that the legal obligation was breached does not lead “naturally and logically” to the conclusion that the breach caused the injury. Id. at 485.

Wills contends that it is entirely possible that decedent would not have developed squamous cell carcinoma if defendants had complied with their obligations to monitor benzene. We cannot say, however, that it is reasonably probable that defendants’ non-compliance and decedent’s cancer were causally related. See The Mabel, 35 F.2d at 732. No reference to our “common experience” in admiralty, or to authorities with “wide experience in maritime navigation,” supports the conclusion that the failure to monitor benzene levels led “naturally and logically” to decedent’s fatal cancer. See Wilkins, 446 F.2d at 485. In this regard, we agree with the Third Circuit that The Pennsylvania Rule “was [not] intended to increase the likelihood of liability no matter how remote and unrelated an injury to a statutory [or regulatory] violation.” In re Complaint of Nautilus Motor Tanker Co., 85 F.3d 105, 114 (3d Cir.1996).

Although Wills relies heavily on our decision in In re Seaboard Shipping Corp., 449 F.2d 132, 136 (2d Cir.1971), our decision to apply The Pennsylvania Rule in that case does not prompt us to apply the Rule here. In re Seaboard involved a controversy between a barge owner and a tugboat owner that arose after two bargemen drowned when the tugboat and the barge it was hauling were caught in a violent storm. Id. at 133. Together, the owners of the tugboat and the barge advanced the money to settle claims brought by the bargemen’s survivors; thereafter, they sued one another for exoneration. Id. Although the barge suffered from an inoperative radio and a leaky lifeboat, the barge owner nonetheless argued that he was not partially liable because the tugboat, which negligently steered both vessels into the path of the storm, had not proven that the absence of the barge’s required safety features caused the bargemen to drown. Id. at 136. In applying The Pennsylvania Rule, we held that the lack of proof disadvantaged the barge and the parties were jointly liable. Id. at 139. The factual circumstances of that case, however, are wholly distinguishable from the instant case. In In re Seaboard, the facts suggested that the “tragedy would not have occurred” absent the barge’s statutory violations which left it “mute and helpless.” Id. at 136, 138. Here, there is no indication that decedent’s cancer would not have occurred if defendants had complied with coast guard regulations.

Wills, however, argues that application of The Pennsylvania Rule in this case is necessary to give effect to the purposes of the Jones Act to compel defendants’ compliance with safety obligations. The plaintiff in Wilkins raised a similar argument. Nevertheless, we were “not persuaded that there axe broad considerations of policy which require that we extend the admiralty rule of The Pennsylvania ... to embrace Jones Act cases.” Wilkins, 446 F.2d at 486; see also Pierro v. Carnegie-Illinois Steel Corp., 186 F.2d 75, 78 (3d Cir.1950) (finding application of The Pennsylvania Rule inappropriate in Jones Act claim for death of overworked seaman). We are aware that in the years since we decided Wilkins, some courts have applied The Pennsylvania Rule in Jones Act cases. See Reyes v. Vantage S.S. Co., 609 F.2d 140, 145-46 (5th Cir.1980); Marine Solution Servs., Inc. v. Horton, 70 P.3d 393, 407 (Alaska 2003). The facts of the instant case, however, present no compelling reason to depart from our prior precedents. Even if we were persuaded that The Pennsylvania Rule should be applied in some Jones Act cases, we would still decline to apply the rule in cases where, as here, it cannot be said with confidence that the plaintiffs injury resulted from defendants’ actions.

III. Wills’s Jones Act Claims

Having determined that Wills, rather than defendants, bears the burden of proving causation, we turn to whether the district court was correct in holding that Wills failed to carry her burden and that summary judgment in favor of defendants was warranted. In considering defendants’ motion for summary judgment, the district court first determined that Wills was required to proffer expert testimony on the issue of causation. After ruling that Wills’s proffered expert testimony on the issue of causation was inadmissible, the district court granted defendants’ motion for summary judgment because Wills had not proffered evidence from which a reasonable jury could conclude that decedent’s cancer was even partially caused by his alleged exposure to toxins while aboard defendants’ ships. Wills, 2002 WL 140542, at *17.

On appeal, Wills reminds us that as a Jones Act plaintiff, she “shoulders a lighter burden [for establishing negligence] than [her] counterpart on land would carry.” McMillan v. Marine Sulphur Shipping Corp., 607 F.2d 1034, 1039 (1979) (internal quotation marks and citation omitted). She argues that the district court, in excluding her proposed expert testimony on the issue of causation, failed to appreciate her reduced burden to prove causation. Wills claims that, by granting summary judgment in favor of defendants on the ground that she failed to proffer admissible evidence on the issue of causation, the district court’s undermined “the right of the jury to pass upon the question of fault and causation,” a right that in Jones Act cases “must be most liberally viewed.” Oxley, 923 F.2d at 25 (internal quotation marks omitted). In reviewing Wills’s claims, we consider whether: (1) expert testimony was required to prove causation; (2) under the Jones Act, the standards for the admissibility of expert testimony apply in full force; (3) the district court abused its discretion in excluding Wills’s proposed expert testimony; and (4) in the absence of admissible evidence on the issue of causation, summary judgment was properly granted to defendants. Answering these questions affirmatively, we agree with the district court’s conclusion that Wills failed to satisfy her burden to prove causation and that summary judgment in favor of defendants was warranted.

A. Expert Testimony Necessary to Prove Causation

Wills argues that summary judgment was improperly granted because expert testimony was not necessary to satisfy her burden to prove causation. It is well settled that expert testimony is unnecessary in cases where jurors “are as capable of comprehending the primary facts and of drawing correct conclusions from them as are witnesses possessed of special or peculiar training.” Salem v. United States Lines Co., 370 U.S. 31, 35, 82 S.Ct. 1119, 8 L.Ed.2d 313 (1962) (internal quotation marks omitted). Where, however, the nexus between the injury and the alleged cause would not be obvious to the lay juror, “[e]xpert evidence is often required to establish the causal connection between the accident and some item of physical or mental injury.” Moody v. Maine Cent. R.R. Co., 823 F.2d 693, 695 (1st Cir.1987). In a case such as this, where an injury has multiple potential etiologies, expert testimony is necessary to establish causation, even in view of plaintiffs reduced burden to prove causation. See Claar v. Burlington N. R. Co., 29 F.3d 499, 503-04 (9th Cir.1994) (affirming district court’s grant of summary judgment following plaintiffs failure to proffer admissible expert testimony on the issue of causation in a case brought under the Federal Employers’ Liability Act); Moody, 823 F.2d at 695 (affirming the district court’s grant of summary judgment to defendants when plaintiff failed to proffer admissible expert testimony linking workplace harassment to emotional trauma). Indeed, this court has never held that a Jones Act plaintiff can survive summary judgment in a toxic tort case without admissible expert testimony on the issue of causation.

Wills argues, however, that our holding in Ulfik v. Metro-North Commuter R.R., 77 F.3d 54 (2d Cir.1996) stands for the proposition that a Jones Act or FELA plaintiff may survive summary judgment, even in the absence of expert testimony on the issue of causation. In Ulfik, the plaintiff brought a FELA action against defendants for an injury suffered as a result of a fall following plaintiffs exposure to paint fumes. Id. at 56-57. We concluded that summary judgment was not warranted because no expert testimony was necessary to establish the causal nexus between inhaling paint fumes and the dizziness that allegedly led to plaintiffs fall. Id. at 59-60. This case is wholly distinguishable from Ulfik in that, here, we cannot rely on circumstantial, lay evidence alone to create a genuine issue of material fact as to whether toxins emitted from defendants’ vessels caused decedent’s cancer. As we have noted, the causal link between exposure to toxins and other behavior and squamous cell, carcinoma is sufficiently beyond the knowledge of the lay juror that expert testimony is required to establish causation. See Claar, 29 F.3d at 504 (finding that expert testimony was required to establish the causal nexus between plaintiffs’ injuries and their exposure to harmful chemicals). Accordingly, we agree with the district court that Wills was required to proffer expert testimony on the issue of causation, and, in the absence of such testimony, that the district court properly granted defendants’ motion for summary judgment.

B. Daubert’s Standards Apply in the Context of the Jones Act

Wills also contends that even if expert testimony on the issue of causation is required to survive summary judgment, she proffered admissible expert testimony, which the district court improperly excluded. Specifically, Wills maintains that because her burden of proof on the issue of causation is relaxed under the Jones Act, the standards of reliability and credibility used to determine admissibility of expert testimony under Rule 702 and Daubert are also relaxed. To support this contention, Wills relies on Hines v. Consolidated Rail Corp., 926 F.2d 262 (3d Cir.1991). In Hines, the plaintiff brought suit against his employer under the Federal Employers’ Liability Act (“FELA”), 45 U.S.C. §§ 51-60, a statute, which, like the Jones Act, provides plaintiffs with a reduced burden of proof to establish causation. In deciding plaintiffs claims, the Third Circuit, in a decision that predates Daubert, stated that “the standard [of proof] under FELA can significantly influence a determination of the admissibility of [expert] testimony.” Hines, 926 F.2d at 269. For the reasons discussed, we find this argument unavailing and hold that Daubert’s standards for determining the admissibility of expert testimony apply regardless of whether the plaintiffs burden to prove causation is reduced.

Although Wills correctly characterizes her burden of proof to establish causation under the Jones Act, she fails to appreciate that the standards for determining the reliability and credibility of expert testimony are not altered merely because the burden of proof is relaxed. As both the Sixth and Ninth Circuits observed in the context of FELA claims, “the standard of causation ... and the standards for admission of expert testimony under the Federal Rules of Evidence are distinct issues and do not affect one another.” Claar, 29 F.3d at 503; see also Taylor v. Consol. Rail Corp., 114 F.3d 1189 (Table), 1997 WL 321142, at *6-7 (6th Cir. June 11, 1997) (quoting Claar, 29 F.3d at 503, and noting that “[i]t is well established that the [admissibility of expert testimony] is controlled — even in cases arising] under FELA[, which, like the Jones Act, has a relaxed burden of proof to show causation] — by the Federal Rules of Evidence and the seminal case of Daubert ”) (internal citation omitted). We agree that even where, as here, plaintiff faces a relaxed burden of proof with regard to causation, the district court’s admission of expert testimony is nonetheless governed by the strictures of Rule 702 and Daubert.

C. The District Court’s Exclusion of Dr. Bidanset’s Testimony Was Not an Abuse of Discretion

Wills contends that the district court’s exclusion of Dr. Bidanset’s testimony was an abuse of discretion. First, she maintains that the district court’s concerns that Dr. Bidanset failed to establish that exposure to carcinogenic substances while aboard defendants’ ships was the specific cause of decedent’s cancer were misplaced. Under the Jones Act, she claims, a plaintiff need not demonstrate that defendant’s action caused the injury, but rather a plaintiff need show only that defendant’s actions were one of perhaps many causes of the injury. Wills’s arguments miss the point of the district court’s conclusions.

Rule 702 of the Federal Rules of Evidence, which governs the admissibility of scientific or technical expert testimony, provides:

If scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion or otherwise, if (1) the testimony is based upon sufficient facts or data, (2) the testimony is the product of reliable principles and methods, and (3) the witness has applied the principles and methods reliably to the facts of the case.

In Daubert, the Supreme Court made clear that the district court has a “gatek-eeping” function under Rule 702, and is charged with “the task of ensuring that an expert’s testimony both rests on a reliable foundation and is relevant to the task at hand.” 509 U.S. at 597, 113 S.Ct. 2786. In fulfilling this role, the district court must consider both the reliability and relevance of the proffered testimony. In gauging reliability, the district court should consider' the indicia of reliability identified in Rule 702, namely, (1) that the testimony is grounded on “sufficient facts or data;” (2) that the testimony “is the product of reliable principles and methods;” and (3) that “the witness has applied the principles and methods reliably to the facts of the case.” Fed.R.Evid. 702. In so doing, the district court must “make certain that an expert, whether basing testimony upon professional studies or personal experience, employs in the courtroom the same level of intellectual rigor that characterizes the practice of an expert in the relevant field.” Kumho Tire Co., 526 U.S. at 152, 119 S.Ct. 1167.

Although Rule 702 sets forth specific criteria for the district court’s consideration, these criteria are not exhaustive. The district court may consider a number of other factors in determining the reliability of the proffered testimony, including: (1) whether a theory or technique has been or can be tested; (2) “whether the theory or technique has been subjected to peer review and publication;” (3) “the technique’s known or potential rate of error” and “the existence and maintenance of standards controlling the technique’s operation;” and (4) whether a particular technique or theory has gained general acceptance in the relevant scientific community. See Daubert, 509 U.S. at 593-94, 113 S.Ct. 2786. In the instant case, the district court rejected Dr. Bidanset’s testimony on the grounds that it failed to comport with any of the relevant Daubert factors for reliability of expert testimony and granted summary judgment in favor of defendants because Wills failed to proffer admissible evidence of causation.

Wills first challenges the district court’s exclusion of Dr. Bidanset’s testimony on the grounds that it failed to quantify the dosage of the toxin to which decedent was allegedly exposed. Wills maintains that the court misapprehended Dr. Bidanset’s “oncogene theory” of causation and excluded the theory merely because it was not generally accepted in the scientific community. She further argues that the district court’s requirement that Dr. Bidanset quantify dosage was unfair, as, she contends, defendants failed to monitor properly the concentration of toxins on ships upon which decedent worked, and she was not permitted sufficient discovery to determine the dosage amount. We find no abuse of discretion.

Dr. Bidanset’s oncogene theory of causation, as the district court noted in its comprehensive and thorough discussion, see Wills, 2002 WL 140542, at *13-15, posits that decedent’s cancer was caused by a single exposure — regardless of the quantity of the dosage — of toxic chemicals such as benzene and PAHs. Although the district court observed that the oncogene theory was not generally accepted in the scientific community, id. at *13, this factor was not determinative in the court’s decision to exclude Dr. Bidanset’s testimony. Instead, the district court considered the oncogene theory in light of Daubert’s four factors for reliability and concluded that the oncogene theory failed to satisfy any of the relevant factors. Id. at *13-14. The district court determined that there was no evidence that the theory had been tested or subjected to peer review. Id. at *13. Indeed, Dr. Bidanset admitted that the theory was the product of his own “background experience and reading,” rather than scientific testing or peer review. Bidanset Dep. at 67. Further, the court found that Dr. Bidanset did not state a known or potential error rate for the theory. Id. Finally, the district court determined that the “dose-response relationship” was the more generally accepted theory of causation in the scientific community, and that the oncogene theory, as Bidanset conceded in his deposition testimony, was controversial. Id. at *14. The district court’s assessment was entirely appropriate for discharging its duty to determine whether the “reasoning or methodology underlying the [proposed expert] testimony is scientifically valid.” Daubert, 509 U.S. at 592-93,113 S.Ct. 2786.

Dr. Bidanset’s proposed expert testimony on the issue of dosage amount also relied on the affidavit testimony of Mark Miller, a seaman who worked on the same ships as decedent for a period of five months in 1995. In his affidavit, Miller averred that he and other seamen had suffered from various ailments that could be attributed to harmful exposure to toxins. Miller also referred to conversations that he had with decedent regarding decedent’s symptoms of exposure to dangerous toxins. Based on these observations, Miller opined that decedent was exposed to a harmful dose of toxins while aboard defendants’ ships. Dr. Bidanset relied on Miller’s testimony in concluding that exposure to toxins while aboard defendants’ ships was the cause of decedent’s squamous cell carcinoma. The district court, however, found Miller’s testimony insufficient to support expert testimony. Id. at *11.

We agree with the district court that Miller’s testimony was insufficient to establish that decedent had been exposed to a harmful amount of toxins or that such exposure caused his cancer. First, Miller, a seaman, lacked the “practical experience and necessary academic training” to analyze and quantify the dosage of the toxins emitted aboard defendants’ ships. See McCulloch v. H.B. Fuller Co., 61 F.3d 1038, 1042-43 (2d Cir.1995) (affirming district court’s admission of chemical engineer’s expert testimony linking plaintiffs injury to exposure to toxic fumes). Absent some technical or professional expertise in detecting and quantifying toxic emissions, Miller’s testimony was insufficient to establish dosage amount. Moreover, during decedent’s ten-year career at sea, he served aboard the same ship as Miller only for a period of five months — and then in different areas of the ship and in different capacities. There can be no question that lay opinions of this sort provide an insufficient basis for an expert to extrapolate the amount of toxins to which decedent was exposed.

In addition to the fact that it failed to satisfy any of the Daubert factors for reliability, Dr. Bidanset’s proposed expert testimony suffered from another fatal flaw. Although Dr. Bidanset conceded that cigarette smoking and alcohol consumption were major risk factors for the development of squamous cell carcinoma, he failed to account for these variables in concluding that decedent’s cancer was caused by exposure to toxic chemicals such as benzene and PAHs. See Amorgianos, 303 F.3d at 265 (noting that expert testimony may be excluded where “the flaw is large enough that the expert lacks good grounds for his or her conclusions”) (internal quotation marks omitted). We agree with the district court that Dr. Bidanset’s failure to account for decedent’s smoking habit and alcohol consumption as possible causes of decedent’s squamous cell carcinoma, strongly indicated that Dr. Bidanset’s conclusions were not grounded in reliable scientific methods, as required by Daubert.

Absent admissible expert testimony on the issue of causation, Wills was unable to sustain her burden to prove causation. It is well established that summary judgment is warranted where there is an absence of evidence that could “ ‘justify with reason the conclusion that employer negligence played any part, even the slightest, in producing the injury.’” Diebold v. Moore McCormack Bulk Transport Lines, Inc., 805 F.2d 55, 57-58 (2d Cir.1986) (emphasis in original) (quoting Rogers v. Mo. Pac. R.R. Co., 352 U.S. 500, 506, 77 S.Ct. 443, 1 L.Ed.2d 493 (1957)); see also Quam v. Mobil Oil Corp., 599 F.2d 42, 43 (2d Cir.1979) (affirming judgment as a matter of law against Jones Act plaintiff where “[t]here was simply no evidence of causation”). Accordingly, defendants’ motion for summary judgment was properly granted.

IV. The District Court’s Discovery Rulings

On appeal, Wills also challenges several of the district court’s discovery rulings on the grounds that the rulings prevented her from obtaining the information necessary to sustain her burden to establish causation. In particular, she argues that the district court’s exclusion of two proposed expert witnesses as untimely and the court’s stay of discovery were improper. For the reasons that follow, we disagree.

A. The District Court’s Exclusion of Haas and Neugut

In an order dated February 26, 2001, the district court granted defendants’ application to preclude as untimely the expert opinions of Dr. Alfred I. Neugut, an epidemiologist, and Mr. Paul Haas, an industrial hygienist. Wills, subsequently petitioned the court to reconsider its decision. The district court denied plaintiffs request with prejudice. Despite Wills’s arguments to the contrary, these exclusions cannot be characterized as abuses of discretion.

On October 14, 1999, the district court ordered Wills to disclose, pursuant to Fed. R.Civ.P. 26(a)(2)(A) and (B), all potential experts no later than November 1, 1999. On November 19, 1999, Wills produced Dr. Bidanset’s expert report, but did not produce expert reports for either Haas or Dr. Neugut. In a letter dated December 6, 2000, Wills informed the court for the first time that she intended to rely upon the opinion of Haas to meet her burden to prove causation; however, she did not produce Haas’s report at that time. In February 2001, after defendants had filed their motion for summary judgment, Wills identified Dr. Neugut as an expert for the first time. She produced expert reports for both proposed experts with her response to defendants’ motion for summary judgment.

As we noted earlier, the district court has “wide discretion” to direct the discovery process. See In re Fitch, Inc., 330 F.3d at 108 (internal quotation marks omitted). A district court abuses its discretion “when the action taken was improvident and affected the substantial rights of the parties.” Goetz v. Crosson, 41 F.3d 800, 805 (2d Cir.1994) (internal quotation marks omitted). Here, the district court provided Wills ample opportunity to identify experts and submit expert reports in a timely fashion, as directed by Fed.R.Civ.P. 26(a)(2)(B). Wills, however, did not avail herself of these opportunities and instead, chose to identify experts one at a time, in a manner that appeared intended to delay completion of the pre-trial process.

Moreover, it is unclear whether the substance of the proposed experts’ testimony would be sufficient to allow Wills to survive summary judgment. Haas’s proposed expert testimony asserted that defendants did not comply with their obligations to monitor and perform health maintenance as required by OSHA regulations. Dr. Neugut relied upon a number of epidemiological studies that purportedly established a relationship between the toxins to which decedent was allegedly exposed and a variety of cancers. Although both experts could correct a particular deficit identified by the district court in its review of Dr. Bidanset’s expert testimony, neither expert fully satisfied all of the issues that concerned the district court in determining that Wills had failed to satisfy her burden to prove causation. Accordingly, because the district court’s exclusion of the experts’ testimony was neither improvident nor affected plaintiffs substantial rights, there was no abuse of discretion.

B. The District Court’s Stay of Discovery Was Not Improper

In December 1999, the district court stayed Wills’s request to conduct depositions of a number of defendant employees and to obtain various documents, pending resolution of defendants’ motion to exclude Dr. Bidanset’s expert testimony. Shortly thereafter, in January 2000, the district court lifted the stay only for the purpose of allowing defendants to provide Wills copies of defendants’ emissions monitoring reports conducted pursuant to OSHA and coast guard regulations, and any medical records pertaining to decedent. Wills, 2000 WL 42201, at *3. The district court, however, determined that the December 6, 1999 stay would remain in effect with regard to Wills’s other discovery requests until the court determined the admissibility of Dr. Bidanset’s proposed expert testimony. Id.

On appeal, Wills argues that the stay was improper because it resulted in an incomplete record and prevented Wills’s additional expert witnesses from completing and submitting their expert reports in a timely fashion. We find this argument unavailing.

It is axiomatic that the trial court enjoys wide discretion in its handling of pre-trial discovery. In re Fitch, 330 F.3d at 108. We will reverse a district court’s discovery ruling only upon a clear showing of an abuse of discretion. Id. In the instant case, the district court’s order staying discovery pending a decision on the admissibility of Dr. Bidanset’s expert testimony was well within the scope of its discretion. The stay was limited to Wills’s request to conduct depositions of a number of defendants’ employees and document demands for voluminous records relating to many of defendants’ vessels. Further, the stay was not indefinite, but rather was effective until the district court determined the issue of Dr. Bidanset’s admissibility as an expert witness under Rule 702. Finally, following the exclusion of Dr. Bidanset as an expert, the district court permitted Wills an opportunity to identify what discovery she had been prevented from obtaining and why such discovery “would lead the Court to a different conclusion on [the issue of] causation.” Wills, 2002 WL 140542, at *17. In no way can such a stay be characterized as an abuse of discretion. In a complex toxic tort suit, the district court properly limited discovery to those requests tailored to provide evidence of the salient issue — causation. Moreover, given the district court’s obligation to manage effectively pre-trial proceedings, it was not improper to limit plaintiffs discovery requests where there were concerns that such requests were intended only to “create a causation theory unsupported by current medical science or to harass defendants into an offer of settlement.” Wills, 2002 WL 1482624, at *3.

V. Wills’s Claim for Maintenance and Cure

In her complaint, Wills also alleged several claims under general maritime law. Of these general maritime claims, Wills has presented only her claim for maintenance and cure on appeal; thus, her remaining maritime claims are waived. See LoSacco v. City of Middletown, 71 F.3d 88, 92-93 (2d Cir.1995) (noting that arguments not raised on appeal are waived). With regard to her claim for maintenance and cure, Wills claims that although decedent’s illness was not diagnosed while he was employed by defendants, his illness manifested itself during his employment. She argues that defendants are obligated to provide maintenance and cure, and that the district court improperly granted summary judgment in favor of defendants on this issue. We disagree.

The general maritime law of the United States provides seamen who have become ill or injured while in a ship’s service with the right to maintenance and cure. Ammar v. United States, 342 F.3d 133, 142 (2d Cir.2003) (collecting cases). “Maintenance” refers to a shipowner’s duty to provide food and lodging to an ill or injured seaman, comparable to the kind and quality received aboard ship, id, while “cure” refers to “a shipowner’s obligation to provide [such] medical care to such seamen” during the period of recovery or rehabilitation from the illness or injury to the point of maximum recovery, Calo v. Ocean Ships, Inc., 57 F.3d 159, 162 (2d Cir.1995). Both obligations attach irrespective of shipowner negligence and regardless of whether the illness or injury was job-related. Ammar, 342 F.3d at 142 (discussing maintenance); Calo, 57 F.3d at 162 (discussing cure).

Ordinarily, the no-fault obligation of shipowners to provide maintenance and cure extends only to a seaman who becomes ill or injured while “in the service of the ship.” See Aguilar v. Standard Oil Co., 318 U.S. 724, 731-32, 63 S.Ct. 930, 87 L.Ed. 1107 (1943) (internal quotation marks omitted). A seaman whose illness or injury manifests after conclusion of his or her employment with the shipowner is generally not entitled to recover for maintenance and cure absent “convincing proof of causal connection” between the injury or illness and the seaman’s service. Brahms v. Moore-McCormack Lines, Inc., 133 F.Supp. 283, 286 (S.D.N.Y.1955) (citing Miller v. Lykes Bros-Ripley S.S. Co., 98 F.2d 185, 186 (5th Cir.1938); Capurro v. The All America, 106 F.Supp. 693, 694 (E.D.N.Y.1952)).

To support her contention that decedent’s illness manifested itself during his employment aboard defendants’ ships, Wills refers to the affidavit of Mark Miller, who testified that “decedent complained to me on several occasions of symptoms he was experiencing while working aboard [defendants’ ship] in 1995.” As we have noted, Miller, a fellow seaman, lacks the medical training or expertise necessary to conclude reliably that decedent’s squamous cell carcinoma presented itself while decedent was employed by defendants or was caused by exposure to toxic emissions while in defendants’ employ.

Wills further argues that even if decedent’s illness manifested itself following the conclusion of his employment with defendants, defendants are nonetheless obligated to pay maintenance and cure because decedent’s condition was caused by exposure to toxic emissions while aboard defendants’ ships. Again, we disagree. As has been discussed elsewhere in this opinion, Wills has not established that decedent’s illness was caused by exposure to toxic emissions while aboard defendants’ ships. Accordingly, this claim was properly dismissed on summary judgment.

CONCLUSION

Affirming the district court’s grant of summary judgment to defendants, we conclude that the district court did not abuse its discretion when it stayed discovery or when it excluded Wills’s proffered expert testimony as scientifically unreliable or untimely. We also conclude that the district court did not err in declining to apply The Pennsylvania Rule to Wills’s claims. Because Wills lacked the required expert testimony or evidence on the issue of causation, the district court properly granted summary judgment on Wills’s Jones Act claim. Finally, Wills was not entitled to recover on her maritime claim for maintenance and cure. 
      
      . Wills’s complaint also asserted a products liability claim and claims on behalf of a putative class of seamen who developed cancer after being exposed to toxins aboard defendants’ vessels. The district court dismissed Wills’s products liability claim with prejudice after Wills expressly waived it. (Order of June 14, 1999). The district court also dismissed Wills's class allegations after she failed to comply with a court order to submit a class action affidavit as required by Fed. R.Civ.P. 23. See Wills v. Amerada Hess Corp., No. 98 Civ. 7126(RPP), 1999 WL 500142, at *2 (S.D.N.Y. July 15, 1999). Neither of these orders is before us on appeal.
     
      
      . On January 14, 2000, the court lifted the stay in order to compel defendants to comply with an earlier discovery order and to provide plaintiff with defendants' records of emissions monitoring. Wills v. Amerada Hess Corp., No. 98 CIV. 7126(RPP), 2002 WL 1482624, at *3 (S.D.N.Y. July 9, 2002).
     
      
      . In her complaint, Wills alleged that defendants breached their duty to exercise due care and diligence by failing to provide decedent a reasonably safe place to work. For purposes of this appeal, we assume these issues but do not reach them in determining the case.
     
      
      . Wills also argues that she is entitled to imposition of The Pennsylvania Rule because the defendants violated OSHA regulations governing the permissible levels of toxic emissions aboard their vessels. See 24 C.F.R. §§ 1910.1000, 1910.1025, 1926.55. As Wills's counsel acknowledged at oral argument, however, we have previously held that a shipowner’s violation of OSHA regulations is insufficient to trigger application of The Pennsylvania Rule. See Jones v. Spentonbush-Red Star Co., 155 F.3d 587, 594-96 (2d Cir.1998) (finding absence of congressional intent in enacting the Occupational Safety and Health Act to shift the burden of proof to shipowner found to be in violation of OSHA regulation).
     
      
      . See also Pierro v. Carnegie-Illinois Steel Corp., 186 F.2d 75, 78 (3rd Cir.1950) (describing The Pennsylvania Rule as the "product of a philosophy peculiar to United States admiralty law, that disasters are likely to occur when statutes passed for the express purpose of promoting safely in navigation are violated").
     
      
      . In the maritime context, "allision” refers to the running of one ship upon another ship that is stationary. See Webster’s Third New International Dictionary 56 (1986).
     
      
      . The Jones Act incorporates FELA by reference. Under both statutes, the plaintiff bears a reduced burden of proof with respect to causation. Accordingly, in determining this appeal, we refer to the law developed under FELA, as well as that developed under the Jones Act. See Puthe v. Exxon Shipping Co., 2 F.3d 480, 482 (2d Cir.1993) (noting that analysis of plaintiff’s Jones Act claims is guided by FELA caselaw); Johannessen v. Gulf Trading & Transp. Co., 633 F.2d 653, 656 (2d Cir.1980) (recognizing that the standard of liability under the Jones Act is the same as that under FELA).
     
      
      . Although we agree with the Sixth and Ninth Circuits that Daubert applies in the context of the Jones Act, we recognize that Daubert's relevancy inquiry may be affected by the reduced statutory burden of proof in such cases. See Daubert v. Merrell Dow Pharm., Inc., 43 F.3d 1311, 1321 (9th Cir.1995) (noting, in the context of remand from the Supreme Court, that, where the burden of proof to establish causation was “by a preponderance of the evidence,” expert testimony that would fail to satisfy Daubert's reliability inquiry might nonetheless satisfy the relevance inquiry because of the reduced burden of proof). We express no opinion on this issue of whether and how Daubert's relevancy inquiry is affected by a reduced burden of proof, however, as our conclusion that Dr. Bidanset's testimony was properly excluded rests solely on the fact that the testimony failed to satisfy any of the Daubert factors for assessing reliability.
     