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Analysis of Xq27-28 linkage in the international consortium for prostate cancer genetics (ICPCG) families
- Joan E Bailey-Wilson1, 7, 32Email author,
- Erica J Childs1, 2,
- Cheryl D Cropp1,
- Daniel J Schaid3,
- Jianfeng Xu4,
- Nicola J Camp5,
- Lisa A Cannon-Albright5, 6,
- James M Farnham5,
- Asha George1, 7, 8,
- Isaac Powell7, 9,
- John D Carpten7, 10,
- Graham G Giles11, 12, 13,
- John L Hopper11, 13,
- Gianluca Severi11, 12, 13,
- Dallas R English11, 12, 13,
- William D Foulkes11, 14,
- Lovise Mæhle11, 15,
- Pål Møller11, 15,
- Rosalind Eeles11, 16,
- Douglas Easton11, 17,
- Michelle Guy11, 16,
- Steve Edwards11, 16,
- Michael D Badzioch11, 18,
- Alice S Whittemore19, 20, 21,
- Ingrid Oakley-Girvan19, 20, 21, 42,
- Chih-Lin Hsieh19, 22,
- Latchezar Dimitrov4,
- Janet L Stanford23, 24,
- Danielle M Karyadi23, 25,
- Kerry Deutsch23, 26,
- Laura McIntosh23, 24,
- Elaine A Ostrander23, 25,
- Kathleen E Wiley27,
- Sarah D Isaacs27,
- Patrick C Walsh27,
- Stephen N Thibodeau28,
- Shannon K McDonnell28,
- Scott Hebbring28,
- Ethan M Lange29, 30,
- Kathleen A Cooney29, 31,
- Teuvo LJ Tammela32, 33, 34,
- Johanna Schleutker32, 33, 34,
- Christiane Maier35, 36, 37,
- Sylvia Bochum35, 37,
- Josef Hoegel35, 37,
- Henrik Grönberg38,
- Fredrik Wiklund38,
- Monica Emanuelsson39,
- Geraldine Cancel-Tassin40,
- Antoine Valeri40,
- Olivier Cussenot40, 41,
- William B Isaacs27 and
- and the International Consortium for Prostate Cancer Genetics
© Bailey-Wilson et al.; licensee BioMed Central Ltd. 2012
Received: 26 July 2011
Accepted: 30 April 2012
Published: 19 June 2012
Genetic variants are likely to contribute to a portion of prostate cancer risk. Full elucidation of the genetic etiology of prostate cancer is difficult because of incomplete penetrance and genetic and phenotypic heterogeneity. Current evidence suggests that genetic linkage to prostate cancer has been found on several chromosomes including the X; however, identification of causative genes has been elusive.
Parametric and non-parametric linkage analyses were performed using 26 microsatellite markers in each of 11 groups of multiple-case prostate cancer families from the International Consortium for Prostate Cancer Genetics (ICPCG). Meta-analyses of the resultant family-specific linkage statistics across the entire 1,323 families and in several predefined subsets were then performed.
Meta-analyses of linkage statistics resulted in a maximum parametric heterogeneity lod score (HLOD) of 1.28, and an allele-sharing lod score (LOD) of 2.0 in favor of linkage to Xq27-q28 at 138 cM. In subset analyses, families with average age at onset less than 65 years exhibited a maximum HLOD of 1.8 (at 138 cM) versus a maximum regional HLOD of only 0.32 in families with average age at onset of 65 years or older. Surprisingly, the subset of families with only 2–3 affected men and some evidence of male-to-male transmission of prostate cancer gave the strongest evidence of linkage to the region (HLOD = 3.24, 134 cM). For this subset, the HLOD was slightly increased (HLOD = 3.47 at 134 cM) when families used in the original published report of linkage to Xq27-28 were excluded.
Although there was not strong support for linkage to the Xq27-28 region in the complete set of families, the subset of families with earlier age at onset exhibited more evidence of linkage than families with later onset of disease. A subset of families with 2–3 affected individuals and with some evidence of male to male disease transmission showed stronger linkage signals. Our results suggest that the genetic basis for prostate cancer in our families is much more complex than a single susceptibility locus on the X chromosome, and that future explorations of the Xq27-28 region should focus on the subset of families identified here with the strongest evidence of linkage to this region.
Prostate cancer (PC) is the most common male cancer in developed countries . In the United States, each year there are over 200,000 newly diagnosed cases and over 30,000 deaths attributable to prostate cancer . Family history, along with older age and African-American ancestry, are the most important risk factors established to date. Inherited genetic factors might account for a proportion of the familial risk, but it has been very difficult to discover the actual genetic basis of prostate cancer probably due to the large number of loci involved, the incomplete and possibly low penetrance associated with these loci, and the likely clinical and genetic heterogeneity of this disease.
In 1996, the first prostate cancer linkage report implicated chromosome 1q23-25 , but subsequent linkage studies have found contradictory conclusions. In this same year the International Consortium for Prostate Cancer Genetics (ICPCG), consisting of researchers from 11 groups around the world, was formed. With the initial aim of examining linkage and trying to replicate previous linkage findings the ICPCG pooled 1,323 pedigrees with clinically- (but not genetically-) defined “hereditary prostate cancer” (HPC). Given the large number of families in this dataset, it was hoped that this would provide increased power to confirm or exclude linkage, and to allow for informative linkage analyses of large homogeneous subsets in an attempt to control for some of the likely heterogeneity that would otherwise weaken the ability to detect linkage. The ICPCG analysis of 775 families supported the finding of a prostate cancer–susceptibility gene linked to 1q24-25 in a defined subset of prostate cancer families with early age at onset, at least 5 affected relatives and evidence of male-to-male transmission . The RNASEL gene was later implicated as harboring rare variant alleles that increase risk of prostate cancer and may account for this linkage signal . Evidence has been accumulating in support of RNASEL as a prostate cancer risk locus, with several recent large case–control and cohort studies and a very large meta-analysis all showing significant associations of prostate cancer risk with polymorphisms in this locus [6–10].
Several other susceptibility loci presumed to contain rare variants of large effect on individual risk of prostate cancer have been suggested [3, 4, 11–42] and reviewed elsewhere [30, 41, 42]. In addition, recent genome-wide association studies (GWAS) have implicated multiple loci at which there are common variants (single nucleotide polymorphisms; SNPs) that are not necessarily functional but are associated with small effects on individual risk of prostate cancer [43–49]. For a review see Varghese and Easton . Work is proceeding to try to identify more susceptibility loci, by GWAS using common SNP risk alleles, by conventional linkage analyses aimed at detecting genes with rare, high-penetrance risk alleles and by whole exome and whole genome sequencing analyses that can be used in conjunction with linkage and GWAS results.
In 1998, a study of 360 multiple-case families found evidence for a prostate cancer susceptibility locus on chromosome X in the region Xq27-q28 (HPCX) . A subset of 52 Finnish families from this study was used to examine whether phenotypic subsets of families exhibited different evidence for linkage to this region. This study showed that families with no male-to-male (NMM) transmission and late age of onset of prostate cancer (> 65 years) exhibited stronger evidence of linkage to the Xq27-28 region than did the complete set of families . There have been five replication studies, four of which supported linkage of prostate cancer susceptibility to this region [6, 21, 51–53] with the study of large Utah pedigrees yielding independent genome-wide significant evidence of linkage , and one which did not support linkage to this region . A fine-mapping study in the Finnish population examined association of prostate cancer to microsatellite markers in the HPCX Xq27-28 region using 108 independent prostate cancer patients selected from families with multiple affected men (55 were from the linkage study above) and 257 controls (anonymous, healthy male blood donors) from the same Finnish population. Significant association was observed for two markers in the region, DXS1205 (p = 0.0003) and bG82i1.1 (p = 0.0006), with stronger association observed at DXS1205 in the subset of 60 cases from families with no evidence of male-to-male transmission (p = 0.0002) . Association of these two markers with prostate cancer risk has been replicated in an Ashkenazi Jewish founder population . Positive associations were observed for allele 135 of the bG82i1.1 marker (OR = 1.77, P = 0.01) and allele 188 of DXS1205 (OR = 1.65, P = 0.02) in 979 prostate cancer cases and 1,251 controls.
Under the Xq27-q28 linkage peak is a region of ~750 kb containing five SPANX genes (SPANX-A1, -A2, -B, -C, and -D). The SPANX genes encode nucleus-associated sperm proteins and their expression has been detected in a variety of cancers. While they were originally suggested as candidate genes for the HPCX susceptibility locus , more recent work has found no association between prostate cancer and mutations in any of these genes . However, a more complex involvement of these genes is possible. Putative candidate genes for association with prostate cancer have been found on other regions of the X chromosome.
Gudmundsson et al. conducted a genome-wide SNP association study of prostate cancer in over 23,000 Icelanders followed by a separate replication study. Of the two novel SNPs identified by this study, one, rs5945572, was found on XP11.22 (odds ratio (OR) = 1.23) . Eeles et al. also found association to this region in a large GWAS . However, the odds ratios for the risk genotypes at this putative locus are quite small and not likely to be responsible for the linkage signal observed on Xq in highly aggregated pedigrees.
The aims of this study were to examine the evidence for linkage of prostate cancer to chromosome X using 1,323 multiple-case prostate cancer families from the ICPCG and genotyping a consensus map of 25 microsatellite markers and using both parametric and non-parametric allele-sharing linkage analyses. The pedigree subsets evaluated were presence/absence of male-to-male disease transmission (a surrogate for X-linked inheritance), Carter criteria of HPC [57, 58], average age at onset of affected men in the family (<65 years of age or ≥ 65 years), and number of men in a family with confirmed PC. Determining whether any of these subsets show stronger evidence of linkage to the region may guide the selection of cases for future mutational analysis in this region.
This analysis was performed on 1,323 families with hereditary prostate cancer ascertained by 11 groups participating in the ICPCG. The process of ascertaining families and confirming diagnosis of prostate cancer differed among the groups, but in all samples, men were considered to be affected with prostate cancer only if medical records or death certificates could confirm the diagnosis. The 11 groups that participated in this linkage analysis are described elsewhere .
In the statistical analysis, all families were first analyzed together. In addition, several subsets of families were created based on pedigree characteristics. A pedigree was classified as satisfying the Carter criteria for hereditary prostate cancer [57, 58] if at least one of the following conditions were met: 1) three consecutive generations of PC along a line of descent; 2) at least three first-degree relatives with a diagnosis of PC; 3) two or more relatives with a diagnosis of PC at age ≤ 55 years. Pedigrees were also classified according to whether transmission of PC in the family appeared consistent with X-linked transmission (yes versus no versus unclear). A pedigree was considered to be consistent with X-linked transmission if all affected males only had a family history of prostate cancer on the maternal side of the family so there was no evidence of male-to-male transmission of a prostate cancer risk allele. A pedigree was considered to be inconsistent with X-transmission if the family contained at least one affected father-affected son pair or if at least one affected son had an affected paternal uncle or paternal grandfather (male-to-male transmission). Pedigrees containing at least one male who had a family history of prostate cancer on both sides of his family (bilineal) were considered to be inconsistent with X-transmission. Pedigrees containing only a sibship of affected men with no information about the prostate cancer history on the maternal or paternal sides of the family were considered to be unclear for X-transmission. Pedigrees were also classified as to whether or not the average age at onset of affected men in the family was less than 65 years of age.
Markers used in the analysis with map location information (base pair locations from the UCSC Goldenpath version hg13, released Nov.14.2002 and cM locations from the deCode linkage map)
deCode cM Position
interpolated cM position
The allele frequencies for each marker in each group were estimated by counting alleles across all families, ignoring genetic relationships. All groups ran analyses using the widely-spaced genome-wide screening (GWS) markers (shown in bold text in Additional file 1: Table S1 and Table 1). Since some groups had also genotyped fine-mapping (FM) markers after finding suggestive evidence for linkage, our primary analyses used the GWS markers in order to attempt to eliminate any biases due to different information content across datasets. We also performed secondary analyses that included both GWS and FM markers. Since individual groups had fine-mapped at different densities and therefore obtained different levels of information content in their families, the secondary analyses were quite variable across samples in the amount of information available from the FM markers. This variability in marker density across studies could result in bias and so the combined analyses using the GWS markers are considered more reliable. We created two marker maps, one for the GWS markers and one for the FM markers (Table 1 shows the merged map of the GWS and FM markers).
A parametric model for dominant X-linked inheritance was used: the “Smith” model , with 2 liability classes, adapted to affecteds-only, X-linkage and a sex-limited trait. Multipoint parametric and non-parametric analyses were performed using GENEHUNTER-PLUS. After combining the results, multipoint heterogeneity LOD scores (HLODs)  were computed using the LOD scores from all sites. For the nonparametric allele-sharing LODs, the Kong and Cox allele sharing statistics were computed using output files from GENEHUNTER-PLUS .
Nonparametric, maximum multipoint allele-sharing LODs (location, number of families) for subsets of families
Number of affected males in family
Family consistent with X-linkage
Family not consistent with X-linkage
0.26 (136 cM, 58)
0.17 (127 cM, 386)
3.49 (134 cM, 288)
0.12 (134 cM, 37)
0.71 (83 cM, 93)
0.19 (109 cM, 308)
6 or more
0.59 (176 cM, 9)
0.74 (109 cM, 5)
1.70 (153 cM, 139)
Subset analyses yielded larger HLOD scores in some subsets under this 2-liability class dominant parametric model. When using the GWS marker set, the subset of 104 families consistent with X-linked transmission, the 484 unclear families and the 735 non-X-linked (male-to-male transmission) families all gave positive HLODs, with a stronger signal observed in the latter group of families. When the FM marker set was used, the same pattern was observed: the subset of X-linkage transmission families gave a maximum HLOD = 0.246 at 132 cM, the unclear families gave a maximum HLOD = 0.142 at 143 cM, and the non-X-linkage families (male-to-male transmission families) yielded a maximum HLOD = 0.62 at 153 cM. The subset of 627 families with mean age at onset 65 years or younger gave HLOD = 1.8 at 138 cM using the GWS markers. The 696 families with mean age greater than 65 had maximum HLOD = 0.32 at 120 cM. Subdivisions based on the Carter criteria alone were not highly correlated with linkage evidence. Number of affected males in the family had a larger effect on linkage evidence, particularly when combined with pattern of transmission. The 732 families with 2–3 affecteds per family had maximum HLOD = 2.01 at 134 cM, whereas the 438 families with 4–5 affected males had HLOD = 0.1 at 168 cM and the 153 families with 6 or more affected males had HLOD = 1.4 at 153 cM. Consistent with the non-parametric analyses, the strongest evidence for linkage occurred in the subset of 288 families with 2–3 affected males and at least some evidence of male-to-male transmission: maximum multipoint HLOD = 3.24 at 134 cM (Figure 1b). Interestingly, when the analysis of this subset was restricted to the 248 families that were not included in the originally published linkage study , the maximum multipoint HLOD increased slightly to 3.47 at 134 cM, which exceeds the 3.3 value suggested by Lander and Kruglyak for genome-wide significance (Figure 1c). The subset of 330 families with 2–3 affected males who also met the Carter criteria gave similarly strong linkage results with a maximum multipoint HLOD = 2.38 at 137 cM in all such families (Figure 1d) and 2.74 at 138 cM in the 284 families in this subset that were not included in the original X-linkage publication  (Figure 1e).
In the analyses presented here, there appeared to be little distinction between families with phenotypic segregation patterns consistent with X-linked inheritance (no male-to-male transmission) or those with evidence of male-to-male transmission when considering linkage evidence provided by those subsets of families for a PC susceptibility locus at Xq27-q28. Families with smaller numbers of affected men appeared to contribute the most evidence to linkage in this region. While classification of each family based on proportion of affected men out of total men old enough to be affected might provide more homogeneous subsets, this was not feasible for this study given the many sources of families with quite different ascertainment schemes and different degrees of completeness of pedigree data collection. In addition, given that prostate cancer is a late age at onset disease and is quite common, we are only able to assign “unaffected” status to men who are over the age of 75 years and who have a normal digital-rectal exam and normal PSA at that advanced age. There are small numbers of such well-characterized, elderly unaffected men in this set of families and most of the families do not have any of them, which would make a proportion misleading. Families with 2–3 affecteds per family had maximum HLOD = 2.01 at 134 cM. However, the strongest suggestion of linkage was observed in both the parametric and non-parametric analyses in families with 2–3 affecteds and possible male-to-male transmission. This pattern was observed whether we included the families from the initial linkage publication in the analysis or not. This subset of families, when excluding the families from the original linkage publication, had a multipoint HLOD of 3.47 at 134 cM. The HLOD in these new families was slightly over the Lander and Kruglyak threshold of 3.3 for genome-wide “significant” linkage but this threshold does not account for our multiple testing of different subsets, which likely requires a larger threshold to claim robust statistical evidence of linkage. However, this level of significance would meet the Lander and Kruglyak threshold for replication of a previously significant linkage (p = 0.01 or a LOD of approximately 1.0) even after correction for the multiple analyses. One candidate locus, SPANXB1, lies under this linkage peak. Since prostate cancer is fairly common, our analysis models allowed for the presence of sporadic cases in the families and the families with possible male-to-male transmission included some bilineal families. Thus, it is possible that in the male-to-male transmission family subsets, some families show sharing of X-chromosome markers among the maternally-related affected relative pairs in these pedigrees and no sharing among the paternally related affected pairs, thus giving evidence for X-linkage in these families. It appears that the evidence for linkage to Xq27-q28 is being driven mainly by families not included in the original linkage study  and these new families have had very few FM markers genotyped in this region (Additional file 1: Table S1). Interestingly, when the FM markers were added to the analyses of these same subsets, the HLODs no longer reached the Lander and Kruglyak genome-wide significance threshold. The information content when using only the GWS markers was fairly consistent across all families. However, when the FM markers were added, the information content differed greatly across groups of families and between the original and new families. An additional difference between the original and new families is that the families from the original linkage study had no markers genotyped more centromeric than 144 cM. Thus, it is possible that the differing position of linkage peaks between the analyses of the original and new families coupled with differential linkage information across these datasets is contributing to the inconsistent results.
Although our results do not provide strong evidence for a major prostate cancer susceptibility gene located in this region of Xq27-28, there is some evidence for a locus that may contribute to risk in families with 2–3 affecteds and in some larger families such as the one in Figure 2. This locus does not appear linked to prostate cancer risk in a high proportion of larger HPC families with many affected males. Given these observations, gene identification efforts in highly penetrant families would be better targeted to other chromosomal regions, perhaps using whole-exome or whole genome DNA sequencing techniques. Gene identification at Xq27-28 should be aimed at the families with smaller numbers of affected men identified here as belonging to the most strongly linked subset and to specific large families with strongly positive LOD scores.
The members of the International Consortium for Prostate Cancer Genetics are as follows:
ACTANE Group: + Principal Investigators
UK, Sutton: S. Bullock, Q. Hope, S. Edwards, S. Bryant, S. Mulholland, S. Jugurnauth, N. Garcia, M. Guy, L. O'Brien, B. Gehr-Swain, A. Hall, R. Wilkinson, A. Ardern-Jones, D. Dearnaley, The UKGPCS Collaborators, British Association of Urological Surgeons' Section of Oncology, R. Eeles +
UK, Cambridge: Chris Evans, M. Dawn Teare, Doug Easton + (Cancer Research UK Genetic Epidemiology Unit, Strangeways Research Labs, Cambridge)
Australia: John Hopper+, Graham Giles+, Dallas English, Gianluca Severi
(The Cancer Council of Victoria and The University of Melbourne, Carlton, Australia)
Canada: William D. Foulkes+, Nancy Hamel, Steven Narod, Jaques Simard+
(Department of Medical Genetics, Research Institute of the McGill University Health Centre, Montreal, Quebec; Women's College Hospital Research Institute, University of Toronto; Laboratoire de gÃ©nomique des cancers, Centre de Recherche du CHUQ, Laval University, Quebec City)
Texas: Mike Badzioch+, Chris Amos (MD Anderson Cancer Centre, Houston, TX and Division of Medical Genetics, University of Washington Medical Centre, Seattle, WA)
Norway, Oslo: Ketil Heimdal, Lovise Mæhle, Pål Møller + (Unit of Medical Genetics, Norwegian Radium Hospital, Oslo)
Norway, Ullevaal: Nicolai Wessel, Tone Andersen + (Dept of Oncology, Ullevaal University Hospital, Oslo)
EU Biomed: Tim Bishop+, The EU Biomed Prostate Cancer Linkage Consortium
(Cancer Research UKGenetic Epidemiology Laboratory, St James’ University Hospital, Leeds, UK)
BC/CA/HI Group: Raymond N. Balise1, Richard Gallagher2, Jerry Halpern1, Chih-lin Hsieh3, Laurence Kolonel4, Ingrid Oakley5, Dee West1,5, Alice S. Whittemore1 and Anna Wu3 (1Stanford University School of Medicine, Stanford, CA; 2British Columbia Cancer Center, Vancouver; 3University of Southern California, Los Angeles, CA; 4University of Hawaii, Honolulu, HI; 5Northern California Cancer Center, Union City, CA, Stanford, CA;)
CeRePP Group: Géraldine Cancel-Tassin, Antoine Valéri, Philippe Mangin, Olivier Cussenot (Centre de Recherche pour les Pathologies Prostatiques, Paris, France)
JHU Group: Kathleen E. Wiley, Sarah D. Isaacs, Marta Gielzak, Charles M. Ewing, Patrick C. Walsh, William B. Isaacs (Johns Hopkins Medical Institutions, Baltimore, MD)
Mayo Group: Daniel J. Schaid, Shannon K. McDonnell, Gerald B. Christensen, Julie M. Cunningham, Scott Hebbring, Jennifer C. Guenther, Stephen N. Thibodeau (Mayo Clinic, Rochester, MN)
Michigan Group: Ethan M. Lange1, Cralen C. Davis1, W. Mark Brown1, Cathryn H. Bock2, Kathleen A. Cooney2 (1Wake Forest University, Winston-Salem, NC; 2University of Michigan, Ann Arbor, MI)
Fred Hutchinson Cancer Research Center Group (PROGRESS): Kerry Deutsch1, Danielle M. Friedrichsen2, Suzanne Kolb3, Elaine A. Ostrander2, Lee Hood1, Janet L. Stanford3 (1Institute for Systems Biology, Seattle, WA; 2National Human Genome Research Institute, NIH, Bethesda, MD; 3Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA)
Tampere Group:Tiina Wahlfors1, Henna Mattila1, Virpi Laitinen1, Riikka Nurminen1, Daniel Fischer1, Teuvo L.J. Tammela1, Asha George2, Joan Bailey-Wilson3, Johanna Schleutker1 (1University of Tampere and Tampere University Hospital, Tampere, Finland; 2Fox Chase Cancer Center, Division of Population Science, Philadelphia, PA; 3Inherited Disease Research Branch, National Human Genome Research Institute, National Institutes of Health, Baltimore, MD)
Ulm Group: Ulm Group: Sylvia Bochum1, Thomas Paiss2, Josef Hoegel1, Florian Kurtz1,3, Manuel Luedeke1,2, Antje Rinckleb1,2, Kathleen Herkommer2,3, Walther Vogel1, Mark Schrader2, Christiane Maier1,2 (1Institut fuer Humangenetik, Universitätsklinikum Ulm, Ulm, Germany 2Urologische Klinik, Universitaetsklinik Ulm, Ulm, Germany, 3Urologische Klinik rechts der Isar, Technische Universitaet Muenchen, Munich, Germany)
Umeå/Karolinska Group: Fredrik Wiklund, Anders Bergh, Monica Emanuelsson, Ingela Göransson, Björn-Anders Jonsson, Fredrik Lindmark, Elisabeth Stenman, Henrik Grönberg(Umeå University, Umeå, Sweden and Karolinska Institutet, Stockholm, Sweden)
Utah Group: Lisa A. Cannon-Albright, Nicola J. Camp, James M. Farnham (University of Utah, Salt Lake City, UT)
Data Coordinating Center: Jianfeng Xu, Deborah A. Meyers, Bao-Li Chang, Aubrey R. Turner, Latchezar Dimitrov, Tamara S. Adams (Center for Human Genomics, Wake Forest University School of Medicine, Winston-Salem, NC)
Daniella Seminara (National Cancer Institute, Division of Cancer Control and Population Sciences, Bethesda, Maryland)
We would like to express our gratitude to the many families who participated in the many studies involved in the International Consortium for Prostate Cancer Genetics (ICPCG). The ICPCG, including the consortium’s Data Coordinating Center (DCC), is made possible by a grant from the National Institutes of Health U01 CA89600 (to W.B.I.). This project was supported in part by the Intramural Research Programs of the National Human Genome Research Institute and the National Cancer Institute, National Institutes of Health (J.E.B-W, E.L.C., C.D.C., E.A.O., D.M.K.). Additional support to participating groups, or members within groups, is as follows:
ACTANE Group: Genotyping and statistical analysis for this study, and recruitment of U.K. families, was supported by Cancer Research U.K (CR-UK). Additional support was provided by The Prostate Cancer Research Foundation, The Times Christmas Appeal and the Institute of Cancer Research. Genotyping was conducted in the 'Jean Rook Gene Cloning Laboratory' which is supported by BREAKTHROUGH Breast Cancer - Charity No. 328323. The funds for the ABI 377 used in this study were generously provided by the legacy of the late Marion Silcock. We thank S. Seal and A. Hall for kindly storing and logging the samples that were provided. D.F.E is a Principal Research Fellow of CR-UK. Funding in Australia was obtained from The Cancer Council Victoria, The National Health and Medical Research Council (grants 940934, 251533, 209057, 126402, 396407), Tattersall’s and The Whitten Foundation. We would like to acknowledge the work of the study coordinator M. Staples and the Research Team B. McCudden, J. Connal, R. Thorowgood, C. Costa, M. Kevan, and S. Palmer, and to J. Karpowicz for DNA extractions. The Texas study of familial prostate cancer was initiated by the Department of Epidemiology, M.D. Anderson Cancer Center. M.B. was supported by an NCI Post-doctoral Fellowship in Cancer Prevention (R25). BC/CA/HI Group: USPHS CA67044. Research carried out by WDF was supported by the Department of Defense.
Fred Hutchingson Cancer Research Center Group: USPHS CA80122 (to J.L.S.) which supports the family collection; USPHS CA78836 (to E.A.O), with additional support from the Fred Hutchinson Cancer Research Center. JHU Group: Genotyping for the JHU, University of Michigan, University of Tampere, and University of Umeå groups’ pedigrees was provided by NHGRI genotyping staff including E. Gillanders, MP Jones, D. Gildea, D. Freas-Lutz, C. Markey, J. Carpten and J. Trent. Mayo Clinic Group: USPHS CA72818. Michigan Group: USPHS CA079596. University of Tampere Group: The Competitive Research Funding of the Pirkanmaa Hospital District, Reino Lahtikari Foundation, Finnish Cancer Organisations, Sigrid Juselius Foundation, and Academy of Finland grant 118413. University of Ulm Group: Deutsche Krebshilfe, grant number 70-3111-V03. University of Umea Group: Work was supported by the Swedish Cancer Society and a Spear grant from the Umeå University Hospital, Umeå, Sweden. University of Utah Group: Data collection was supported by USPHS CA90752 (to L.A.C.-A.) and by the Utah Cancer Registry, which is funded by Contract HHSN261201000026C from the National Cancer Institute's Surveillance, Epidemiology, and End-Results Program with additional support from the Utah State Department of Health and the University of Utah. Partial support for all datasets within the Utah Population Database was provided by the University of Utah Huntsman Cancer Institute and also by the USPHS M01-RR00064 from the National Center for Research Resources. Genotyping services were provided by the Center for Inherited Disease Research (N01-HG-65403). CeRePP Group: work was supported by the Association pour la Recherche sur le Cancer, grant number 5441. DCC: The study is partially supported by USPHS CA106523 (to J.X.), USPHS CA95052 (to J.X.), and Department of Defense grant PC051264 (to J.X.).
The funding bodies did not play a role in study design, in the collection, analysis, and interpretation of data, in the writing of the manuscript or in the decision to submit the manuscript for publication.
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