Recent alcohol consumption and risk of incident ovarian carcinoma: a pooled analysis of 5,342 cases and 10,358 controls from the Ovarian Cancer Association Consortium
- Linda E Kelemen1Email author,
- Elisa V Bandera2,
- Kathryn L Terry3, 4,
- Mary Anne Rossing5,
- Louise A Brinton6,
- Jennifer A Doherty5,
- Roberta B Ness7,
- Susanne Krüger Kjær8, 9,
- Jenny Chang-Claude10,
- Martin Köbel11,
- Galina Lurie12,
- Pamela J Thompson12,
- Michael E Carney12,
- Kirsten Moysich13,
- Robert Edwards14,
- Clare Bunker15,
- Allan Jensen8,
- Estrid Høgdall8,
- Daniel W Cramer3, 4,
- Allison F Vitonis3,
- Sara H Olson16,
- Melony King2,
- Urmila Chandran2,
- Jolanta Lissowska17,
- Montserrat Garcia-Closas18,
- Hannah Yang6,
- Penelope M Webb19,
- Joellen M Schildkraut20,
- Marc T Goodman12, 21,
- Harvey A Risch22,
- , on behalf of the Australian Ovarian Cancer Study Group and Australian Cancer Study (Ovarian Cancer) and
- and on behalf of the Ovarian Cancer Association Consortium
© Kelemen et al.; licensee BioMed Central Ltd. 2013
Received: 1 August 2012
Accepted: 17 January 2013
Published: 22 January 2013
Studies evaluating the association between alcohol intake and ovarian carcinoma (OC) are inconsistent. Because OC and ovarian borderline tumor histologic types differ genetically, molecularly and clinically, large numbers are needed to estimate risk associations.
We pooled data from 12 case-control studies in the Ovarian Cancer Association Consortium comprising 5,342 OC cases, 1,455 borderline tumors and 10,358 controls with quantitative information on recent alcohol intake to estimate odds ratios (OR) and 95% confidence intervals (CI) according to frequencies of average daily intakes of beer, wine, liquor and total alcohol.
Total alcohol intake was not associated with all OC: consumption of >3 drinks per day compared to none, OR=0.92, 95% CI=0.76-1.10, P trend=0.27. Among beverage types, a statistically non-significant decreased risk was observed among women who consumed >8 oz/d of wine compared to none (OR=0.83, 95% CI=0.68-1.01, P trend=0.08). This association was more apparent among women with clear cell OC (OR, 0.43; 95% CI, 0.22-0.83; P trend=0.02), although based on only 10 cases and not statistically different from the other histologic types (P value for statistical heterogeneity between histologic types = 0.09). Statistical heterogeneity of the alcohol- and wine-OC associations was seen among three European studies, but not among eight North American studies. No statistically significant associations were observed in separate analyses evaluating risk with borderline tumors of serous or mucinous histology. Smoking status did not significantly modify any of the associations.
We found no evidence that recent moderate alcohol drinking is associated with increased risk for overall OC, or that variation in risk is associated strongly with specific histologic types. Understanding modifiable causes of these elusive and deadly cancers remains a priority for the research community.
Carcinomas classified as ovarian are the fourth most common female cancer, accounting for 225,000 (3.7%) of all new cases and 140,000 (4.2%) of all cancer deaths globally . Known mutations in high penetrance genes are the best-defined risk factors, explaining ~10-15% of all epithelial ovarian carcinomas [2–6], while common variants in low penetrance genes may account for a smaller fraction (~3%) of the polygenic component [7–9]. Non-genetic factors associated with the development of ovarian carcinoma include reduced risk with oral contraceptive use [10, 11], number of full-term pregnancies [12, 13], long-term breastfeeding  and tubal ligation or salpingectomy in BRCA1/2 mutation carriers . The independent contribution of modifiable environmental [15, 16] and lifestyle or behavioral [17–21] factors including diet is inconclusive, and only a few studies have confirmed non-genetic risk factor associations according to histologic type [14, 22–25].
Several studies examined the association between total alcohol consumption and ovarian carcinoma and reported inverse [17, 26, 27], null [28–31], or positive [32, 33] trends with the highest category of alcohol intake. Increased risk was also found among the mucinous histologic type [34, 35]. An earlier pooled analysis of prospective studies found no association between ≥30 g/d total alcohol intake compared to 0 g/d among 2,001 cases of ovarian carcinoma (RR, 1.12; 95% CI, 0.86-1.44), or for alcohol modeled continuously among 121 cases with mucinous histology (RR, 1.06; 95% CI, 0.84-1.34) . A previous meta-analysis reported no overall association between alcohol consumption and ovarian carcinoma, but did find a 6% increased risk of mucinous ovarian carcinomas (95% CI, 1.01, 1.12, n=581) with each increase in intake of 10 g/day alcohol using continuous estimates obtained from authors of primary reports . A more recent meta-analysis of 27 observational studies found no overall association of moderate or heavy drinking, but found an inverse trend with endometrioid ovarian carcinoma from three studies reporting associations by histology . Two other reports summarized the epidemiologic evidence of the relation between alcohol and ovarian carcinoma descriptively  and as a systematic review . Reviews or meta-analytic techniques that summarize categorical data from primary investigations comparing highest to lowest intakes have several limitations, including a loss of data when intermediate intake categories are excluded, which may introduce reporting bias, a problem termed “publication bias in situ” . Additionally, primary studies differ in their adjustment for important confounders, in whether they distinguish invasive cancers from borderline tumors, which differ genetically, molecularly and clinically [41, 42], and in whether they reported associations separately by histologic type. These differences challenge the ability to synthesize published findings. To circumvent these limitations, we conducted a large pooled analysis of original data from 12 studies participating in the Ovarian Cancer Association Consortium (OCAC).
Overview of OCAC studies
White non-Hispanic %*
Carcinoma cases with grade information %†
Recruitment year and location
AOCS (Australian Ovarian Cancer Study) and ACS (Australian Cancer Study – Ovarian Cancer)
State of residence and 5-year age groups
CON (Connecticut Ovarian Cancer Study)
1998-2003; Connecticut, USA
3 age strata (35-49, 50-64 and 65-79 years)
DOVE (Diseases of the Ovary and their Evaluation)
2002-2005 and 2006-2009; Washington, USA
5-year age groups, 1-year calendar intervals and two county strata
GOCS (German Ovarian Cancer Study)
Age and study region
HAWAII (Hawaii Ovarian Cancer Study)
1993-2008; Hawaii, USA
5-year age groups and race
HOPE (Hormones and Ovarian Cancer Prediction Study)
2003-2009; Pennsylvania, USA
5-year age groups and area code plus 3 number prefix
MALOVA (Malignant Ovarian Cancer Study)
5-year age groups
NCOCS (North Carolina Ovarian Cancer Study)
1999-2008; North Carolina, USA
5-year age groups and race
NECC (New England-based Case-Control Study)
1992-1997 and 1998-2003; New England, USA
5-year age groups and region of residence
NJOCS (New Jersey Ovarian Cancer Study)
2002-2008; New Jersey, USA
POL (Polish Ovarian Cancer Control Study)
5-year age groups and study center
SON (Southern Ontario Study of Reproduction, Diet and Health)
1989-1992; Southern Ontario
3 age strata (35-49, 50-64 and 65-79 years)
Alcohol assessment and covariate data collection
The unit of analysis for alcohol consumption was average daily grams of alcohol intake (g/d). Daily alcohol intake was estimated using validated food frequency questionnaires (FFQs) in AUS , DOV , HAW , MAL, NEC , NJO  and SON . The exposure period was the year preceding recruitment (AUS, HAW, MAL, NEC, NJO and SON) or the time period approximately four years before the reference date (DOV). The remaining studies did not use FFQs but embedded questions regarding alcohol intake in risk factor questionnaires (CON , GER, HOP , NCO and POL). The exposure period for these studies was habitual regular drinking at the reference date (HOP) or the time period approximately five years before the reference date (CON, GER, NCO and POL). Daily alcohol intake for all studies was calculated by summing the product of the frequency of consumption of a specified serving of alcoholic beverage (beer, wine and liquor) by the alcohol content of that beverage using national estimates of alcohol content for that country. Total alcohol was estimated as the sum of alcohol intake across all alcoholic beverage types and submitted for pooled analysis. A subset of studies (AUS, CON, DOV, HAW, HOP and NEC) provided information for white and red wine separately.
Key clinical, demographic and questionnaire data on study subjects were merged into a common dataset and included case-control status, ethnicity/race, tumor behavior and histology, age at diagnosis (or comparable reference date for controls), history of prior cancers, current/former/never smoking status, menopausal status, oral contraceptive use, tubal ligation, endometriosis, hysterectomy, family history of breast or ovarian cancer in first-degree relatives, parity, age at last parturition, interview year, age at menarche, body mass index (BMI) and study site. Total energy intake was obtained from studies that collected dietary information using FFQs (AUS, DOV, HAW, NEC, NJO and SON). The data were checked for consistency and completeness and discrepancies were followed-up with individual study investigators.
We excluded from analyses subjects with non-epithelial ovarian tumors, prior histories of cancer other than non-melanoma skin cancer or subjects with missing information for total alcohol intake. Data were available from 5,342 cases of incident ovarian carcinoma, 1,455 women with incident ovarian borderline tumors and 10,358 controls (Table 1).
The studies were combined into a single dataset for analysis. Alcohol intake categories were derived in increments of one standard drink (g ethanol content) consumed daily: alcohol from any source (10 g); 12 oz beer (12.2 g), 4 oz wine (10.5 g) and 1 oz liquor (9.5 g). Primary analyses evaluated associations between alcohol intake and risk of ovarian carcinoma (excluding borderline tumors) using unconditional logistic regression to estimate odds ratios (OR) and 95% confidence intervals (CI). Trends in risk were evaluated by modeling the ordinal variable representing the category values of alcohol intake (e.g., 1, 2, 3) in the regression models with 1 degree-of-freedom . Statistical heterogeneity in ORs across studies was evaluated using the likelihood ratio test comparing models with and without an interaction term between alcohol intake and study site. To describe further the degree of statistical heterogeneity, we estimated I 2 , the between-group variance , which describes the proportion of total variation in estimates of the ORs due to the heterogeneity between groups of studies. We estimated I 2 to evaluate statistical heterogeneity between studies defined by their continent of origin. Groups of studies with statistically homogeneous ORs have an I 2 value of zero.
All models were adjusted for the known or potential confounders footnoted in the tables. Risk models associated with total alcohol intake did not include other alcoholic beverage types. Risk models associated with beer, wine or liquor intake included all three beverage types and were thus adjusted for each other. Risk models associated with white or red wine intake included both types of wine as well as beer and liquor intake. To account for potential heterogeneity of summary risk estimates across studies, all models included interaction terms between every non-alcohol covariate and study site and are thus equivalent to fixed-effects meta-analyses, although the exclusion of these terms did not alter the risk estimates appreciably (data not shown). In addition, among a subset of studies, primary analyses were also adjusted for total energy intake, excluding subjects with extreme total energy values as previously described  and using the residual method , in order to evaluate the extent of confounding from this variable.
For the 12 studies combined, we simultaneously modeled the risk of each of five histologic types of ovarian carcinoma (high-grade serous, low-grade serous, mucinous, endometrioid and clear cell) and two of the four main types of borderline tumors with sufficient numbers for analysis (serous and mucinous) using polytomous logistic regression . Risk models were adjusted for all covariates but excluded the interactions between non-alcohol covariates and study site to ease statistical computation. Statistical heterogeneity of the alcohol-ovarian tumor histology associations was tested separately for the carcinomas and the borderline tumors and was evaluated using the type 3 analysis of effects with degrees-of-freedom equal to the number of response levels minus one times the number of exposure levels minus one . For these models, we incorporated considerations from the contemporary pathology literature to refine risk associations in the analyses of histologic type, as implemented previously . Specifically, others have shown that an appreciable proportion of grade 3 mucinous ovarian carcinomas are, in fact, metastatic from the gastrointestinal tract , up to one-third of endometrioid ovarian carcinomas are high-grade serous ovarian carcinomas [71, 72] and approximately 3% of epithelial ovarian carcinomas are low-grade serous [71, 72]. We, therefore, re-assigned histologic type according to the expected distributions of histology combined with grade observed from large population-based series [71, 72] as follows. Endometrioid carcinomas were re-classified as high-grade serous carcinomas if their grade was ≥G3, mucinous carcinomas were assumed to be metastatic and excluded from analysis if ≥G3, and serous histology was re-classified as either low-grade serous carcinomas (G1) or high-grade serous carcinomas (≥G2).
Because of the reported association between smoking and ovarian carcinoma and, particularly for mucinous ovarian carcinoma and mucinous borderline tumors [22, 24, 25], statistical interaction was evaluated using the likelihood ratio test comparing models with and without an interaction term for the categorical forms of alcohol intake and smoking status (never, current and former). We also performed stratified analyses of alcohol intake across categories of smoking status. Potential modification of the alcohol-ovarian carcinoma association by other variables was examined using a similar approach.
Statistical tests were two-sided and implemented with SAS (SAS Institute, Cary, NC, Version 9.1). Funnel plots representing the study-specific and combined data estimates were derived from the logistic regression models as described above.
Characteristics of included studies and participants
Table 1 describes the characteristics of the 12 case-control studies. Eighty-eight percent of the cases were white non-Hispanic and ~85% of the carcinomas had information on tumor grade. The distribution of alcohol intake is shown in Additional file 1: Table S1, overall and for each study separately. Overall, average daily total alcohol intake ranged from approximately one-fifth of a standard drink at the 25th percentile to 1-2 drinks at the 75th percentile of the distributions. More women consumed wine than the other alcoholic beverages.
Generally, cases and controls were similar in their distributions across covariates (Additional file 1: Table S2). As expected, however, cases were more frequently postmenopausal than controls, were more likely to be nulliparous, and less likely than controls to have used oral contraceptive hormones for appreciable durations or to have had tubal ligation or a hysterectomy. The majority (~75%) of subjects were recruited in the past decade. The distribution of covariates did not differ by much among controls who consumed beer, wine or liquor except, perhaps, that fewer wine consumers were current smokers and a greater proportion of beer drinkers were pre- or peri-menopausal.
Alcohol consumption and risk of ovarian carcinoma
Association between consumers of alcoholic beverages and ovarian carcinoma, OCAC studies
OR (95% CI)
Up to 1 drink *
Up to 12 oz
Up to 4 oz
Up to 4 oz
Up to 4 oz
Up to 1 oz
Alcoholic beverage type and risk of ovarian carcinoma
All studies provided information on type of alcoholic beverage consumed (beer, wine and liquor). Compared to women who reported no wine intake, we observed a statistically non-significant decreased risk associated with consumption of more than 8 oz/d of wine after adjusting for consumption of other types of alcoholic beverage intake (OR=0.83, 95% CI=0.68-1.01, P trend=0.08; Table 2). Associations did not differ by much when we restricted the analyses to those individuals who consumed only one type of alcoholic beverage (data not shown). Among a subset of studies with information on white or red wine consumed, risk associations were not statistically significant.
Alcohol and ovarian tumor histologic types
Association between total alcohol and wine intake and histological types* of ovarian carcinoma, OCAC studies
High-Grade Serous N=2,580
Clear Cell N=501
Low-Grade Serous N=198
OR (95% CI)
OR (95% CI)
OR (95% CI)
OR (95% CI)
OR (95% CI)
Total alcohol ‡
Up to 1 drink
P trend §
Up to 4 oz
>4 oz §
P trend §
Association between total alcohol and wine intake and ovarian borderline tumors, OCAC studies
Serous borderline N=818
Mucinous borderline N=561
Total alcohol *
OR (95% CI)
OR (95% CI)
Up to 1 drink
>2 drinks §
P trend §
Up to 4 oz
>4 oz §
P trend §
Potential sources of effect modification
The association between total alcohol intake (none, any regular consumption) and risk of ovarian carcinoma varied somewhat across studies following multivariable adjustment (Figure 1B , P interaction=0.03); the source of heterogeneity was within the three European studies when evaluated by continent of study origin (within-group heterogeneity: Europe, I 2 =75%; North America, I 2 =0%). The association between wine intake (none, any regular consumption) and risk of ovarian carcinoma also varied across studies following multivariable adjustment (P interaction=0.01) and significant heterogeneity was again observed within the European studies (I 2 =81%). Within North American studies, the estimates for wine intake were statistically homogeneous for ovarian carcinoma overall (OR, 0.99; 95% CI, 0.89-1.10; I 2 =0%). We evaluated whether the decreased risk observed between wine intake and clear cell carcinomas (Table 3) was influenced by the variability within European studies by excluding the three European studies. The association between consumption of >8 oz/d wine and clear cell ovarian carcinomas remained significant (OR=0.48, 95% CI=0.25-0.95; P trend=0.03; 10 cases). Alcohol, in general, has been reported to reduce cellular proliferation by influencing the insulin and insulin-like growth factor (IGF) pathways [73, 74], and these pathways have been implicated in the early development and prognosis of clear cell carcinoma types [75–78]. Because obesity is associated with impaired insulin sensitivity , we tested the trend association of alcohol or wine intake with histologic types stratified by BMI (<30 vs ≥30 kg/m2). There was no clear effect modification by BMI among any of the histologic types for total alcohol intake (data not shown), and suggestive decreased risks for wine intake at lower BMI for both clear cell carcinomas (BMI <30 kg/m2: OR=0.83, 95% CI=0.69-1.00; n=382 cases vs BMI ≥30 kg/m2: OR=0.79, 95% CI=0.53-1.18; n=119 cases) and high-grade serous carcinomas (BMI <30 kg/m2: OR=0.90, 95% CI=0.83-0.98; n=2,052 cases vs BMI ≥30 kg/m2: OR=1.17, 95% CI=0.96-1.42; n=528 cases). Smoking status did not significantly modify the association between ovarian carcinoma and total alcohol intake (P interaction=0.11) or wine intake (P interaction=0.97) (Additional file 1: Table S4) or between mucinous borderline tumors and total alcohol intake (data not shown). None of the other covariates statistically modified the alcohol- or wine-ovarian carcinoma association including race/ethnicity (P interactions ≥ 0.22) (data not shown).
While current guidelines for cancer prevention restrict alcohol drinking for women to no more than 1 drink per day , we found no evidence that recent moderate alcohol drinking increased overall ovarian carcinoma risk. Although there was some indication of effect modification by cell type, the statistical evidence was weak. This is the largest study to date to perform this evaluation quantitatively across the five types of ovarian carcinomas and the two groups of borderline ovarian tumors using individual-level data on alcohol intake.
Various oncogenic mechanisms of alcohol are well documented . Although the evidence is convincing that alcohol is a risk factor for cancers of the breast and several cancers of the gastrointestinal tract , it has been equivocal for ovarian cancer [17, 26–33]. Overall, our investigation adds to the evidence that recent moderate alcohol consumption is not significantly associated with ovarian carcinoma. A number of design and analytic factors can lead to disparate findings across studies. For example, heterogeneity of risk estimates were observed in European studies, a finding also reported by others . The type and range of alcohol intake varies considerably across European countries and should be interpreted carefully when data are pooled or evaluated meta-analytically across continents.
Previous studies reported decreased risk from wine intake [26, 27, 31, 82], although most associations were not statistically significant. The most widely reported constituents in wine are the polyphenols, including resveratrol, which derive mainly from the aerial tissues (grape skin) because their biosynthesis is stimulated by light . Numerous anticarcinogenic properties of the polyphenols have been proposed . A potentially interesting finding in the current study is the association between higher recent intakes of wine with decreased risk of clear cell ovarian carcinoma. The association persisted following exclusion of the European studies. A decreased risk from wine, but not beer or liquor, intake was also found among women in a pooled analysis of 12 prospective studies of renal cell carcinoma . Clear cell ovarian carcinomas share similar features with clear cell renal cell carcinomas [86–88] and it has been suggested that moderate alcohol intake may improve insulin sensitivity and regulate related pathways [73, 74] that are implicated in the etiology of these carcinomas [75–78]. We observed suggestive decreased risks of wine intake among non-obese women for clear cell and high-grade serous ovarian carcinomas; however, we cannot exclude the possibility that these findings are due to chance.
Several key non-genetic risk factors for ovarian cancer were reported in the early 1990s, when studies established decreased risks associated with oral contraceptive use [10, 11], parity [12, 13] and breast-feeding . Using our consortium data, we recently reported that endometriosis was associated with increased risk of endometrioid and clear cell ovarian carcinomas . However, few modifiable risk factors for ovarian cancers have been found. Perhaps the only lifestyle factor that is most consistently associated with modified risk of ovarian cancers is smoking, which is associated with an increased risk of both mucinous ovarian carcinoma and mucinous borderline tumors [24, 25]. This emphasizes the importance of, and the need for more, pooled analyses of individual-level data that are harmonized carefully across different studies through collaborations within consortia, such as OCAC. Clearly, the research community struggles to understand the causes of the majority of these elusive and deadly cancers.
The strengths of this investigation include the analysis of individual-level data from a large sample as well as evaluation of higher levels of intakes (>3 drinks/d) and the standardized method of alcohol analysis, which allowed us to quantify risk associations based on average daily grams of alcohol intake. Although we attempted to reduce potential misclassification of histologic type by applying a pathology-based algorithm, the associations were not appreciably different if the algorithm was not implemented, unlike previous analyses for other exposures where implementation of the algorithm appeared to refine those associations . The large sample of histologic types permitted evaluation of a wider range of alcohol intake, particularly total alcohol and wine intake. While a potential limitation of all case-control studies is recall and selection bias, our pooled estimates are in agreement with other reports [36, 38]. Furthermore, although our findings relating moderate alcohol intake near the time of diagnosis indicated no association with ovarian carcinoma, it is possible that alcohol intake at other points in the life cycle may influence risk, given the long latency period estimated for these cancers .
In conclusion, the results of this investigation do not support an association between recent moderate total alcohol intake and ovarian carcinoma overall. The findings do not strongly support variation in risk associated with specific histologic types. Understanding the modifiable causes of these deadly cancers through rigorous consortium analyses remains a priority for the research community.
LEK is supported by a Canadian Institutes of Health Research New Investigator award (MSH-87734). The Australian Ovarian Cancer Study Management Group (D. Bowtell, G. Chenevix-Trench, A. deFazio, D. Gertig, A. Green, P. Webb) and ACS Investigators (A. Green, P. Parsons, N. Hayward, P. Webb, D. Whiteman) thank all the clinical and scientific collaborators (see http://www.aocstudy.org/) and the women for their contribution. PMW is supported by a Fellowship from the National Health & Medical Research Council of Australia. The CON study was approved by the State of Connecticut Department of Public Health Human Investigation Committee. The cooperation of the 32 Connecticut hospitals, including Stamford Hospital, in allowing patient access, is gratefully acknowledged. Certain data used in this study were obtained from the Connecticut Tumor Registry in the Connecticut Department of Public Health. The CON authors assume full responsibility for analyses and interpretation of these data. The German Ovarian Cancer Study (GER) thank Ursula Eilber and Tanja Koehler for competent technical assistance. The NJO group thanks Lorna Rodriguez, Lisa Paddock and the staff of the New Jersey State Cancer Registry and Thanusha Puvananayagam for their contribution to the study. The POL study thanks Drs Mark Sherman and Nicolas Wentzensen from the Division of Cancer Epidemiology and Genetics of the National Cancer Institute, USA, Drs Neonila Szeszenia-Dabrowska and Beata Peplonska of the Nofer Institute of Occupational Medicine (Lodz, Poland), Witold Zatonski of the Department of Cancer Epidemiology and Prevention, The M. Sklodowska-Curie Cancer Center and Institute of Oncology (Warsaw, Poland), and Pei Chao and Michael Stagner from Information Management Services (Sliver Spring MD, USA) for their valuable contributions to the study.
U.S. Army Medical Research and Materiel Command (DAMD17-01-1-0729), National Health & Medical Research Council of Australia (199600, 400413), Cancer Councils of New South Wales, Victoria, Queensland, South Australia and Tasmania, Cancer Foundation of Western Australia (AUS); NIH (R01 CA074850 and R01 CA080742) (CON); NIH (R01 CA112523 and R01 CA87538) (DOV); German Federal Ministry of Education and Research, Programme of Clinical Biomedical Research (01 GB 9401); genotyping in part by the state of Baden-Württemberg through the Medical Faculty, University of Ulm (P.685); and data management by the German Cancer Research Center (GER); NIH (R01 CA58598, N01 CN-55424 and N01 PC-67001) (HAW); NIH (R01 CA 61107); research grant 94 222 52 from the Danish Cancer Society, Copenhagen, Denmark; and the Mermaid I project (MAL); NIH (R01 CA76016) and the Department of Defense (DAMD17-02-1-0666) (NCO); NIH (R01 CA54419 and P50 CA105009) and Department of Defense W81XWH-10-1-02802 (NEC); NIH (K07 CA095666, R01 CA83918 and K22CA138563), The Cancer Institute of New Jersey (NJO); the Intramural Research Program of the National Cancer Institute (POL), and the National Health Research and Development Program of Health Canada, grant number 6613-1415-53 (SON).
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