Dr. Borak reviewed case materials at the referral of Eagle Picher's legal counsel. He testified that it has not been established through epidemiological studies that benzene is a chemical cause of multiple myeloma. He also disputed whether other chemicals identified by Dr. Pineda and Dr. Parmet were causes of multiple myeloma. His focus exclusively concerned epidemiological studies, and did not rely upon other criteria identified by Dr. Parmet (the other Hill criteria) or sources of evidence recognized by the International Agency on Research on Cancer (identified by Dr. Goldstein) which both physicians said must be considered when considering the issue of causal connection.
Dr. Jonathan Borak is a physician and toxicologist. He is the owner of a consulting firm, Jonathan Borak and Company, Inc. He is an associate professor in public health and medicine at Yale University. The subject matter of this claim falls within one of his specialties. The subjects that he teaches include toxicology and risk assessment.
Dr. Borak criticized the analysis of the three physicians who testified on behalf of Moreland.
Dr. Borak testified that he had reviewed the June 11, 2008, opinion letter of Mr. Moreland's multiple myeloma specialist in Little Rock, Dr. Mauricio Pineda-Roman [Exhibit 2 to Employer's Exhibit 8] in which Dr. Pineda-Roman had opined that Mr. Moreland's exposure to chemicals during his employment at Eagle Picher had significantly contributed to Mr. Moreland's multiple myeloma and skin cancers. Dr. Borak testified that he disagreed with Dr. Pineda-roman's opinion since Dr. Pineda-Roman did not have any independent knowledge of the level of dosage or duration of exposure to any chemical to which Mr. Moreland claimed to have been exposed, and that without this vital information, a medical diagnosis of the causation of any disease is impossible [Employer's Exhibit 8, p. 8].
Dr. Borak also testified about the opinions rendered on behalf of Claimant by Dr. Allen Parmet. Dr. Borak testified that he had reviewed the April 3, 2009 Report that was authored by Dr. Parmet in which Dr. Parmet opined that Mr. Moreland's multiple myeloma is causally related to occupational exposures to multiple chemicals, specifically benzene. [Employer's Exhibit 8, pp.10-11] Dr. Borak testified that Dr. Parmet's opinion that Mr. Moreland had developed multiple myeloma as a result of exposure to benzene or other chemicals is incorrect for multiple reasons.
In his Report, Dr. Parmet's cited a 1992 case study by the Agency for Toxic Substances and Disease Registry [ATSDR], which is a division of the Department of Health and Human Services' Centers For Disease Control. [Employer's Exhibit 8, pp.12-13] Dr. Borak pointed out that the ATSDR report that Dr. Parmet cited contained the statement that there is no scientific proof of a causal relationship between exposure to benzene and multiple myeloma. [Employer's Exhibit 8, p.13] Dr. Borak also testified that ATSDR studies that were conducted since the 1992
study cited by Dr. Parmet, including a 2007 study, have also failed to find that benzene causes multiple myeloma. [Employer's Exhibit 8, pp.13-14]
Dr. Borak also testified about another source that Dr. Parmet cited for the link between benzene and multiple myeloma, which is a chapter from a medical textbook by Harvison. Dr. Borak testified that the cited chapter from the Harvison textbook actually states that while there is evidence that benzene causes leukemia, evidence that benzene might cause multiple myeloma is not strong, and that the Harvison book chapter Dr. Parmet cited also states that the chronic effects of benzene depend on the level of exposure, a critical fact that is unknown in Mr. Moreland's case. [Emphasis added] [Employer's Exhibit 8, p.14]
Dr. Borak next testified about another source that Dr. Parmet cited in support of an alleged link between benzene and multiple myeloma, which is a chapter from a leading toxicology textbook by Casarett and Doull. Dr. Borak pointed out that Dr. Parmet referenced an edition of the textbook that has since been revised twice, and that the more recent editions of the chapter cited by Dr. Parmet do not even mention multiple myeloma, but that the newer editions do state that investigators have concluded that there is no scientific evidence to support a causal relationship between benzene exposure and multiple myeloma. [Employer's Exhibit 8, pp.14-15]
Dr. Borak next testified about another source that Dr. Parmet cited in support of an alleged link between benzene and multiple myeloma, which is a study, authored by a researcher named Aksoy, of approximately 28,000 Turkish leather workers who were exposed to benzene in the course of their leatherworking jobs. Among that group of workers, Aksoy identified 34 cases of acute myelogenous leukemia [AML], but only one case of multiple myeloma. Dr. Borak testified that Aksoy's findings clearly show no proof of association between benzene and multiple myeloma. [Employer's Exhibit 8, pp.15-16]
To confirm that multiple myeloma occurs more frequently than AML in the general population, Dr. Borak pointed out that the incidence rate of multiple myeloma and acute myelogenous leukemia [AML] among white American males of all ages has been tracked by the National Cancer Institute since 1975, and that the chart of that tracking, which is entitled "Surveillance Epidemiology and End Results" [SEER] shows that over that period of time, the incidence rate for multiple myeloma has been greater than it has been for AML, and that the corresponding mortality rate for multiple myeloma was also greater for multiple myeloma than for AML. [Employer's Exhibit 8, pp.63-64, and Exhibits 38 and 39 thereto]
Dr. Borak next testified about another source that Dr. Parmet cited in support of an alleged link between benzene and multiple myeloma, which is a paper by Pyatt that is a review of the link between benzene and hematopoietic malignancies, i.e., cancers involving blood cells, that described multiple myeloma as one of five hematopoietic malignancies for which there are "insufficient data for causal link". Dr. Borak testified that Pyatt's review clearly does not support Dr. Parmet's opinion that benzene causes multiple myeloma. [Employer's Exhibit 8, pp.16-17]
Dr. Borak next testified about another source that Dr. Parmet cited in support of an alleged link between benzene and multiple myeloma, which is a meta-analysis of case-control studies, by a researcher named Sonoda, of the relationship between multiple myeloma and engine exhaust. Dr. Borak pointed out that the individuals studied by Sonoda had, according to Sonoda,
"probable exposure to organic solvents or petroleum", but not to benzene. [Employer's Exhibit 8, p.62] Sonoda's study found that there was actually a significantly decreased association between multiple myeloma and exposure to petroleum, and that the Sonoda study revealed no association between multiple myeloma and exposure to benzene, organic solvents, or petroleum products, meaning that Sonoda's study showed that benzene exposure is not a risk factor for multiple myeloma. [Emphasis added] [Employer's Exhibit 8, pp.17-18]
Dr. Borak next testified about another source that Dr. Parmet cited in support of an alleged link between benzene and multiple myeloma, which is an analysis of a case-controlled study of thirteen hospital or population-based control studies of multiple myeloma that was published in a paper by a researcher named Bezabeh. In his testimony, Dr. Borak pointed out that Bezabeh's findings do not support Dr. Parmet's opinion on causation, since Bezabeh concluded that, "Benzene exposure is unlikely to be a causal agent for multiple myeloma. The current published case control literature is not ambivalent and does not indicate that benzene exposure is a risk factor for multiple myeloma". [Employer's Exhibit 8, p.18]
Dr. Borak next testified about another source that Dr. Parmet cited in support of an alleged link between benzene and multiple myeloma, which is a case-control study by a researcher named Costantini that reviewed risks for acute myelogenous leukemia [AML] and multiple myeloma. Dr. Borak testified that Costantini's study does not support Dr. Parmet's opinion because Costantini reported that his study found an insignificant increase in risk for myeloma, and no increase in risk for AML. Dr. Borak pointed out that this finding causes the results of Costantini's entire study to be questionable because there is a known link between benzene and the incidence of AML, so that if Costantini found no increase in the incidence of AML, the results of the entire study are unreliable. [Employer's Exhibit 8, pp.18-19]
Dr. Borak next testified about another source that Dr. Parmet cited in support of an alleged link between benzene and multiple myeloma, which is a paper by a researcher named Lynge. Dr. Borak pointed out that the Lynge paper discusses solvents in general, and does not even mention multiple myeloma, and does not therefore support Dr. Parmet's opinion regarding a link between benzene and multiple myeloma. [Employer's Exhibit 8, pp.19-20]
Dr. Borak next testified about another source that Dr. Parmet cited in support of an alleged link between benzene and multiple myeloma, which is a meta-analysis by a researcher named Infante. Dr. Borak testified that the Infante study is fatally flawed because Infante did not follow the standards of practice for such studies. Dr. Borak pointed out that Infante improperly utilized "post-hoc" analysis to reach a conclusion from his meta-analysis. Dr. Borak pointed out that Infante knew in advance that he was choosing for inclusion in the study the only group that would achieve the pre-determined result that Infante wanted, because Infante had been involved with studies involving this same group over a twenty year period. Dr. Borak testified that other studies involving this same control group showed results that Infante did not wish to find, so Infante merely ignored those studies.
Dr. Borak also testified that much of what is known about the effects of benzene on workers in America comes from the study of the Pliofilm cohort, a group of approximately 1,200 workers who were exposed to benzene while making a rubberized material during World War Two. [Employer's Exhibit 8, p.24] Dr. Borak testified that there have been a number of follow-
up studies of these workers over the years, and that the information obtained by the study of these workers has shed light on the effect exposure to benzene has had on the workers who were included in this study.
Dr. Borak testified that among the Pliofilm cohort, there was a 5 -fold increase risk of acute myelogenous leukemia [AML], but that there were only four cases of multiple myeloma among the cohort. [Employer's Exhibit 8, p.24] Dr. Borak testified that the Pliofilm cohort was studied by various researchers through the years, and that studies conducted between 1994 and 1996 showed that there had been no more cases of myeloma among the group since a 1987 study, leading the researchers to the conclusion that there was no statistical significance between exposure to benzene and multiple myeloma, i.e., the rate of incidence between benzene and multiple myeloma in the Pliofilm workers was not greater than the incidence of multiple myeloma in the general population. A later analysis of the study of the Pliofilm workers was conducted by Rinsky and published in 2002, and it also confirmed that the relationship between benzene and multiply myeloma was not statistically significant. [Employer's Exhibit 8, p.25] Dr. Borak pointed out that when Infante did his meta-analysis study in 2006, he chose to use the data from the 1981 study rather than the data from the 1994 study, which Dr. Borak pointed out confirmed that Infante had cherrypicked the data in an attempt to prove his hypothesis. [Employer's Exhibit 8, pp.25-26]
Dr. Borak also testified that of the five total cases of multiple myeloma reported in the Pliofilm cohort, four of the cases were in the group that had the lowest exposure to benzene, and that one of those four individuals had been employed in the Pliofilm plant for only four days. Dr. Borak testified that scientists who have studied the link between chemical exposure and disease have correctly insisted that the level of dose of a chemical is an important determinant of effect, a precept that is consistent with the basic principles of toxicology, and a fact that studies of the Pliofilm workers has confirmed. Dr. Borak pointed out, however, that Infante's finding - that there was no dose-response effect - is completely at odds with the basic principles of toxicology. [Employer's Exhibit 8, pp.26-27]
Dr. Borak also testified that none of the chemicals other than benzene to which Mr. Moreland claimed to have been exposed has been shown to be linked to multiple myeloma. [Employer's Exhibit 8, p.27]
Dr. Borak, testifying on behalf of Eagle Picher, explained that the theory of 2E1 upregulation - whether excessive exposure to benzene causes a change in human body metabolism that enhances the development of multiple myeloma - is indeed merely a theory that cannot be substantiated by medical proof.
Dr. Borak pointed out that if 2E1 up-regulation actually existed, it would have manifested in the numerous studies of the Pliofilm cohort. Dr. Borak pointed out that the opposite actually occurred. Multiple myeloma appeared in Pliofilm workers who had only minimal exposure to benzene, which Dr. Borak testified confirms that there is no proof that exposure to high doses of benzene increases the incidence rate of multiple myeloma. [Employer's Exhibit 8, p.47] Dr. Borak also testified that a study of 75,000 Chinese workers who were exposed to very high levels of benzene also did not report an increase of multiple myeloma among those workers greater than the general population. [Employer's Exhibit 8, pp.47-48]
Dr. Borak also testified that the hypothesis of whether 2E1 up-regulation contributes to metabolic changes ignores the fact that a second enzyme, known as NQ01, works in combination with the 2E1 enzyme to produce metabolic changes. Dr. Borak testified that as such, the discussion of possible metabolic change due to benzene exposure is incomplete when both of these factors are not considered. [Employer's Exhibit 8, pp.49-52]
To support his contention that focusing only on the 2E1 enzyme as the factor that determines metabolic change in the presence of benzene, Dr. Borak pointed out that alcohol is known to elevate 2E1 by up to 400 %, meaning that if elevated 2E1 were the sole factor in triggering the alleged metabolic change that leads to multiple myeloma, it could be expected that alcoholics would have a much higher rate of multiple myeloma than non-alcoholics. Dr. Borak testified that this is not the case. Instead, the rate of multiple myeloma among alcoholics is 80 % lower than the general population.
Dr. Borak also testified that the theory of metabolic changes caused by enzymatic alteration is based on the premise that in order to increase the risk of developing multiple myeloma, an increase of 2E1 must be accompanied by a decrease of NQ01. Dr. Borak testified that medical tests have shown that obesity increases both 2E1 and NQ01, thereby increasing the risk that obese persons are more likely to develop multiple myeloma, a scientific finding that refutes the suggestion that 2E1 up-regulation occurring alone increases the risk of developing multiple myeloma. [Employer's Exhibit 8, pp.52-54]
Dr. Borak concluded that, given the scientific evidence that has been produced by numerous studies over several decades, benzene does not cause multiple myeloma, nor does exposure to benzene trigger any metabolic changes that lead to multiple myeloma. [Employer's Exhibit 8, p.59]
Dr. Borak, in a supplemental report, criticized the conclusions of Dr. Allen Parmet. He contended that seven of the ten studies cited by Dr. Parmet did not support the proposition that multiple chemicals could lead to the development of multiple myeloma. Of the three remaining articles, he considered one study to lead to speculative conclusions; another to lead to an association of no statistical significance; and a meta-analysis to be flawed.
Dr. Borak had several criticisms for Dr. Goldstein that concerned benzene toxicity. He first stated that references cited by Dr. Goldstein did not support this proposition. This included studies by Dr. Kirkelit, et al., Dr. Constantini, et al., Joshi and Yng, et al.
Dr. Borak also criticized Goldstein concerning Goldstein's viewpoint upon mechanistic evidence. He stated that this has been Dr. Goldstein's "own editorial since 1990." He stated that this was not based upon epidemiology.
Dr. Borak was also critical concerning Goldstein's viewpoint that obesity would increase the metabolism for benzene and therefore subject Moreland to a higher risk of multiple myeloma. He first testified that this was at odds with the opinions of Dr. Pineda and Dr. Parmet. He also found a lack of scientific support for this proposition based upon epidemiological studies. The studies that concern this found an increased metabolism in low dose patients, where he would
expect to see it in "high dose" cases. He also testified that Goldstein's theory was inconsistent with Goldstein's own book chapter (exhibit 8 from the Goldstein deposition). More specifically, Dr. Borak stated, it was deficiency of NQ01 with the increase of 2E1 that would be important, not merely the increase of 2E1 that would increase metabolism. He stated that Dr. Goldstein ignored the presence of NQ01 in this theory for purposes of testimony in this particular case. Also, obesity is not the only factor that incites 2E1. Alcohol also incites 2E1 "a bit." One, under this theory would expect multiple myeloma in alcoholics, though the incidences of alcohol are both reduced in cases of acute myelegenous leukemia and multiple myeloma. The presence of obesity increases the risk of acute myelegenous leukemia and multiple myeloma. One would need, he stated, an increase in 2E1 and a decrease in NQ01 for the Goldstein theory to be correct.