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High-risk Melanoma Susceptibility Genes and Pancreatic Cancer, Neural System Tumors, and Uveal Melanoma across GenoMEL

¹ Genetic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda Maryland; ² Inherited Disease Research Branch, National Human Genome Research Institute, NIH, Department of Health and Human Services, Baltimore, Maryland; ³ Genetic Epidemiology Division, Cancer Research UK Clinical Centre, Leeds, United Kingdom; ⁴ Department of Medical Genetics, University of Glasgow, Glasgow, United Kingdom; ⁵ Queensland Institute of Medical Research, Brisbane, Queensland, Australia; ⁶ Westmead Institute for Cancer Research, University of Sydney at Westmead Millennium Institute, Sydney, New South Wales, Australia; ⁷ Service de Génétique and ⁸ Service de Dermatologie, Institut Gustave Roussy, Villejuif, France; ⁹ Institut National de la Sante et de la Recherche Medicale-U794, Université d'Evry, Evry, France; ¹⁰ Department of Dermatology and ¹¹ Molecular Cell Biology Laboratory, Department of Internal Medicine C, Sheba Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; ¹² Department of Oncology, Biology, and Genetics, University of Genova, Genova, Italy; ¹³ Dermatology Unit, Maurizio Bufalini Hospital, Cesena, Italy; ¹⁴ Department of Medical Informatics and ¹⁵ Department of Dermatology and Huntsman Cancer Institute, University of Utah School of Medicine, Salt Lake City, Utah; ¹⁶ Department of Biostatistics and Epidemiology and Center for Clinical Epidemiology and Biostatistics and ¹⁷ Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; ¹⁸ Department of Dermatology and ¹⁹ Center for Human and Clinical Genetics, Leiden University Medical Center, Leiden, the Netherlands; ²⁰ Department of Oncology-Pathology, Karolinska Institute and Karolinska University Hospital Solna, Stockholm, Sweden; ²¹ Lund Cancer Center Department of Oncology, University Hospital, Lund, Sweden (see Appendix B); ²² Departments of Medicine and Medical Biophysics, University of Toronto, Toronto, Ontario, Canada; ²³ Wellman Center for Photomedicine, Department of Dermatology and Cancer Center, Massachusetts General Hospital, Boston, Massachusetts; and ²⁴ Dermatology Department and ²⁵ Genetics Service, Melanoma Unit, Hospital Clínic, Institut de Investigació Biomèdica August Pi Suñe, Universitat de Barcelona, Barcelona, Spain; ²⁶ See Appendix A

Requests for reprints: Alisa M. Goldstein, Genetic Epidemiology Branch/National Cancer Institute/NIH/Department of Health and Human Services, Executive Plaza South, Room 7004, 6120 Executive Boulevard, MSC 7236, Bethesda, MD 20892-7236. Phone: 301-496-4375; Fax: 301-402-4489; E-mail: goldstea{at}exchange.nih.gov.

	Abstract

Top Abstract Introduction Materials and Methods Results Discussion Appendix A. Additional authors... Appendix B. Authors from... References

 
GenoMEL, comprising major familial melanoma research groups from North America, Europe, Asia, and Australia has created the largest familial melanoma sample yet available to characterize mutations in the high-risk melanoma susceptibility genes CDKN2A/alternate reading frames (ARF), which encodes p16 and p14ARF, and CDK4 and to evaluate their relationship with pancreatic cancer (PC), neural system tumors (NST), and uveal melanoma (UM). This study included 466 families (2,137 patients) with at least three melanoma patients from 17 GenoMEL centers. Overall, 41% (n = 190) of families had mutations; most involved p16 (n = 178). Mutations in CDK4 (n = 5) and ARF (n = 7) occurred at similar frequencies (2-3%). There were striking differences in mutations across geographic locales. The proportion of families with the most frequent founder mutation(s) of each locale differed significantly across the seven regions (P = 0.0009). Single founder CDKN2A mutations were predominant in Sweden (p.R112_L113insR, 92% of family's mutations) and the Netherlands (c.225_243del19, 90% of family's mutations). France, Spain, and Italy had the same most frequent mutation (p.G101W). Similarly, Australia and United Kingdom had the same most common mutations (p.M53I, c.IVS2-105A>G, p.R24P, and p.L32P). As reported previously, there was a strong association between PC and CDKN2A mutations (P < 0.0001). This relationship differed by mutation. In contrast, there was little evidence for an association between CDKN2A mutations and NST (P = 0.52) or UM (P = 0.25). There was a marginally significant association between NST and ARF (P = 0.05). However, this particular evaluation had low power and requires confirmation. This GenoMEL study provides the most extensive characterization of mutations in high-risk melanoma susceptibility genes in families with three or more melanoma patients yet available. (Cancer Res 2006; 66(20): 9818-28)

	Introduction

Top Abstract Introduction Materials and Methods Results Discussion Appendix A. Additional authors... Appendix B. Authors from... References

 
The etiology of cutaneous malignant melanoma (CMM) is heterogeneous and complex. To date, two high-risk melanoma susceptibility genes CDKN2A (MIM 600160) and CDK4 (MIM 123829) have been identified. Causal mutations in both genes cosegregate with melanoma and are inherited in a dominant pattern. The CDKN2A gene, located on chromosome 9p21, is the major known high-risk melanoma susceptibility gene (1, 2). CDKN2A, a tumor suppressor gene, encodes two distinct proteins translated, in alternate reading frames (ARF), from alternatively spliced transcripts. The transcript, comprising exons 1, 2, and 3, encodes a low molecular weight protein, p16. The p16 protein regulates G₁-phase exit by inhibiting the CDK4-mediated phosphorylation of the retinoblastoma protein (3, 4). The smaller ß transcript, comprising exons 1ß, 2, and 3, specifies the alternative product p14ARF. p14ARF acts via the p53 pathway to induce cell cycle arrest or apoptosis (5, 6). For ease of presentation, we use CDKN2A to represent mutations in the transcript; thus, all CDKN2A mutations involve the p16 protein. For mutations of exon 1ß and large deletions that involve the p14ARF protein, we use ARF. In contrast to CDKN2A, few families with cosegregating CDK4 germ-line mutations have been identified (7–9). To date, all cosegregating CDK4 germ-line mutations have been identified in exon 2, which codes for the p16 binding site (7–9).

In addition to melanoma, other cancers have been observed in some CDKN2A melanoma-prone families. Several studies have shown an increased risk of pancreatic cancer (PC) among CDKN2A melanoma-prone families (10–16). However, the precise relationship between the CDKN2A gene and PC remains unknown. Neural system tumors (NST) have also been reported to be associated with large deletions of CDKN2A/ARF and/or mutations that affect p14ARF but these studies are based on very small numbers of patients/families (17–21). Uveal melanoma (UM) occasionally also occurs in families with multiple CMM patients, suggesting the existence of possible common genetic factors, but to date, only one family with both UM and CMM and a CDKN2A germ-line mutation (p.G67S) has been reported (22).

The International Melanoma Genetics Consortium (GenoMEL), comprising major familial melanoma research groups from North America, Europe, Australia, and the Middle East, reports analyses of the largest familial melanoma sample yet available to examine the characterization of mutations in the three major known high-risk melanoma susceptibility genes. A second goal of the study was to evaluate the relationship between the susceptibility genes and the occurrence of PC, NST, and UM in GenoMEL families.

	Materials and Methods

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Families from 17 GenoMEL centers were pooled for this study. Families with at least three CMM patients that were collected by each of the 17 centers were eligible for the study. Diagnoses were confirmed by review of histologic materials, pathology reports, medical records, or death certificates. To be eligible, families also had to have been evaluated for mutations in the CDKN2A gene (exons 1, 2, and 3; n = 466 families). Mutation evaluation (predominantly sequencing and/or denaturing high-performance liquid chromatography) was conducted at each center on available subjects. In 89% (n = 414) of families, at least 2 CMM patients were screened for CDKN2A mutations. Table 1 presents the number of eligible families and total number of melanoma patients by study center. For all centers, written informed consent was obtained from the subjects before participation in the study under Institutional Review Board–approved protocols. Although the ascertainment of families differed between groups due to variation in local health care procedures and/or approaches for accruing families, the eligibility criteria for inclusion in this study were uniform as described above. Details of the participating families from most of the 17 centers are described elsewhere (see Table 1 for references). Most of the 466 participating families (n = 410 families) were also tested at each center for CDK4 (exon 2) and ARF (exon 1ß) mutations. Evaluation of CDK4 was restricted to exon 2 because no causal mutations have been identified outside of this exon. In addition, 253 of these families were evaluated using real-time quantitative PCR methods or multiplex ligation-dependent probe amplification for large deletions of the CDKN2A and ARF regions. Because of the screening protocols at many centers, many patients/families tested for CDK4 and ARF mutations and/or large deletions had previously identified CDKN2A mutations. For each family, the absence or presence of a mutation was reported. For mutation-positive families, the type of CDKN2A (exons 1, 2, and 3), ARF (exon 1ß), or CDK4 (exon 2) mutation was also recorded. Other variables for study included number of CMM patients in each family, age at first melanoma diagnosis for each CMM patient, and number of melanoma patients and first-degree relatives of melanoma patients with PC, NST, or UM. NST included acoustic neuroma, astrocytoma, ependymoma, glioblastoma, medulloblastoma, meningioma, neuroblastoma, neurofibroma, or neurolemmoma.

View this table: [in this window] [in a new window]   Table 1. Number of families; melanoma patients (confirmed and not confirmed); CDKN2A, CDK4 (exon 2), and ARF (exon 1ß) mutations; and large deletions involving the CDKN2A/ARF regions (exons 1, 1ß, 2, or 3) by study center and country

Evidence for causality for many of the identified mutations, from, for example, segregation with disease, absence of mutations in control samples, and functional studies has been presented previously (see Table 1 for references). To further examine the potential functional consequences of the GenoMEL-reported CDKN2A missense mutations, we evaluated the biochemical severity of the identified CDKN2A missense mutations using the Grantham scale (43) and BLOSUM62 matrix (44). For the Grantham scale, missense mutations were classified as radical or conservative. Using the BLOSUM62 matrix, missense mutations were categorized as nonconservative or conservative. Further, to determine which amino acids in CDKN2A were evolutionarily conserved, the human protein sequence was compared with that of nine other animal species identified using tBLASTn (45). Clustal W (46) was used to create a multispecies alignment of the CDKN2A sequence.

	Results

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Table 1 presents the number of families, melanoma patients, and mutations detected by participating center. There were 466 families with 2,137 CMM patients (1,867 confirmed CMM cases) in this study. The total number of melanoma patients (confirmed and not confirmed) per family ranged from 3 to 54 with a median number of melanoma cases per family of 4. Overall, 41% of families (n = 190) had mutations; of these, 178 families had CDKN2A mutations involving p16. The CDKN2A mutation frequency varied from <25% in Boston, Emilia-Romagna, Philadelphia, Brisbane, Tel Aviv, and Sydney to >50% in Genoa, Glasgow, Leeds, Leiden, Lund, and Toronto. Similar frequencies of mutations (2-3%) were observed for CDK4 (5 of 271) and ARF (7 of 277). The identified mutations included four large deletions of CDKN2A (n = 1) or ARF (n = 3; total, 2%).

Table 2 shows the types and number of mutations and number of families with mutations overall and by geographic locale. There were 66 different mutations (57 CDKN2A mutations) detected in 190 families (178 families with CDKN2A mutations). Sixty-five percent of the mutations were observed only once; the remainder was seen in more than one family. Missense mutations in the same codon of CDK4 were detected in five families, two from North America (both p.R24C) and one each from France, Australia, and United Kingdom (all p.R24H). The seven ARF mutations included four novel splice site mutations (47) observed in families from the Netherlands, United Kingdom (n = 2), and North America and three different large deletions observed in United Kingdom (n = 2) and North American families. Sixty-five percent of the CDKN2A mutations were missense mutations; 16%, deletions; 7%, insertions or duplications; and 5% each, nonsense or splicing mutations. Overall, 40% of the CDKN2A mutations were in exon 1, whereas 53% occurred in exon 2.

View larger version (34K): [in this window] [in a new window]   Figure 1. Number of families with CDKN2A mutations according to family's geographic locale. Seven locales are defined as follows: UK, United Kingdom; MedEur, Mediterranean Europe (Spain and Italy); France; NL, the Netherlands; Swe, Sweden; Aus, Australia; and N Am, North America. For presentation purposes, mutations are presented without leading protein (p.) or sequence change (c.) notation. Codon positions for CDKN2A exons 1 and 2 are noted underneath mutations.

View larger version (82K): [in this window] [in a new window]   Figure 2. Comparison of the human protein sequence for CDKN2A with that of nine animal species generated by Clustal W (46). Arrows, codon positions for exons 2 and 3. Each of the 30 CDKN2A missense mutations observed in the current study is enclosed in a box to more clearly view amino acids across the 10 tested species. Asterisk, the residues or nucleotides in that column are identical in all sequences in the alignment; colon, conserved substitutions have been observed; period, semiconserved substitutions have been observed (below a column).

Table 4 shows the number of families with PC, NST, or UM by gene category. Of the 66 families who had PC, 74% (n = 49) had a CDKN2A mutation. In contrast, 33% (122 of 365) of families without PC, NST, or UM had a CDKN2A mutation. This mutation frequency in melanoma-only families was significantly less than in families that also had PC (P < 0.0001); no such significant difference was observed for families with NST (P = 0.27) or UM (P = 0.28). As reported previously, the presence of PC in a family was strongly associated with the occurrence of a CDKN2A mutation (28% of families with a CDKN2A mutation had PC versus 6% of families with no mutation had PC; P < 0.0001). In contrast, there was no significant association between NST and CDKN2A mutations (P = 0.52). Five of the 11 families with NST and CDKN2A mutations also had at least one case of PC. Only 1 of 8 (12.5%) families with UM had a CDKN2A mutation (p.G67S; P = 0.16; ref. 22).

The distribution of PC differed according to the specific CDKN2A mutation. Among the 10 most common recurrent CDKN2A mutations (comprising 66% of families with CDKN2A mutations), the distribution of PC differed significantly (P = 0.0003). The frequency of PC varied from >60% in p.R112_L113insR and c.225_243del19 to 35% to 50% in p.L32P, p.V126D, and p.G101W, to 15% to 25% in p.R24P and c.-34G>T, and to <11% in p.M53I, c.IVS2-105A>G, and c.32_33ins9-32. For the families with other CDKN2A mutations (n = 60), 18% of families had PC. Evaluation of CDKN2A mutations that affected the p16 protein only versus p16 and p14ARF also showed differences with respect to the occurrence of PC. Whereas among families without PC, there were similar percentages of families with mutations that affected p16 only (19%) versus p16 and p14ARF (17%); among families with PC, these percentages differed substantially (26% versus 49%, respectively). However, the significance of this association varied according to whether the analysis included all reported CMM (P = 0.03) or was restricted to confirmed melanoma patients only (P = 0.15).

	Discussion

Top Abstract Introduction Materials and Methods Results Discussion Appendix A. Additional authors... Appendix B. Authors from... References

 
GenoMEL has created the largest familial melanoma data set yet assembled to characterize mutations in the major known high-risk melanoma susceptibility genes. The data set included 466 melanoma-prone families with 2,137 CMM patients. There were 66 different mutations detected in 190 families. Overall, 41% of families had a mutation in one of the three known high-risk melanoma susceptibility genes; 38% of families (n = 178) had CDKN2A mutations that involved the p16 protein. Seventy percent of the CDKN2A mutations were missense or nonsense mutations, 23% were insertions or deletions, 5% were splicing mutations, and 2% were regulatory mutations. The distribution of CDKN2A mutation types is consistent with that observed in the Human Genome Mutation Database.²⁷ This finding is not surprising because the majority of disease-associated mutations identified to date are highly penetrant mutations associated with Mendelian disorders. In contrast, the seven ARF mutations were either novel splicing mutations (47) or large deletions (18, 50); the five CDK4 mutations were all missense mutations that occurred in the same codon (7–9). Inheritance of the causal mutations of CDKN2A, ARF, and CDK4 are consistent with autosomal dominant inheritance with incomplete penetrance (41, 51). Sixty-five percent of the GenoMEL CDKN2A mutations reported to be associated with familial melanoma were missense mutations that occurred at 30 different codon positions. Examination of two different measures used to predict biochemical severity of missense changes (Grantham scale and BLOSUM62 matrix) suggested that, for the CDKN2A gene, the BLOSUM62 matrix score was a better predictor of altered protein function assumed to be associated with mutations that segregate with familial melanoma.

Several studies have shown that disease-associated mutations are more likely to occur in perfectly conserved codon positions (52, 53). This finding was also observed for the CDKN2A missense mutations described in this study. Eighty percent of the disease-associated mutations occurred in amino acid residues that were perfectly conserved or contained only conserved substitutions across the 10 tested species, whereas only 48% of the total coding amino acids were conserved. This significant result was primarily because of mutations in exon 2. That is, in exon 2, there were significantly more disease-associated mutations that occurred at conserved codons (89%) relative to all conserved codons (55%); however, no such significant difference was observed for exon 1 (64% versus 40%, respectively).

There were striking differences in the frequencies and distributions of mutations across geographic locales. Single founder CDKN2A mutations were the predominant mutations in Sweden (p.R112_L113insR or c.331_332insGTC; ref. 54), comprising 92% of observed families with mutations, and the Netherlands (c.225_243del19; ref. 31), involving 90% of reported families with mutations. France and Mediterranean Europe (Spain/Italy) had the same most frequent CDKN2A founder mutation (p.G101W; ref. 55), encompassing 15% and 60% of families with mutations, respectively. Similarly, Australia and United Kingdom had the same most common recurrent CDKN2A mutations (p.M53I, c.IVS2-105a>G, p.R24P, and p.L32P), comprising 42% and 50% of observed families with mutations, respectively, which was not unexpected as the ancestry of long-term residents of Australia is predominantly British.²⁸ A recent audit, carried out to assess the variability of mutation detection across GenoMEL participating centers, has shown that the divergence in mutation frequencies between centers was not a result of variation in mutation detection approaches; in fact, the standard of screening across groups was uniformly high.²⁹ Future studies are needed to explore whether the difference in mutation distribution leads to genotype-phenotype differences across the geographic locales.

Mutations in CDK4 and ARF occurred at similar rare frequencies (2-3%). Large deletions that affected either p16 or p14ARF were also seen in 2% of the families. These findings have implications for the identification of other high-risk melanoma susceptibility genes. If other susceptibility genes are similarly rare, conventional strategies for detecting these susceptibility loci, such as linkage analysis, may be challenging because most families would be unlinked to the locus. Further, if population frequencies for CDK4 and ARF mutations follow a pattern similar to that seen for CDKN2A (25, 56), the current results suggest that mutations in CDK4 and ARF would be expected to be vanishingly rare in the general population.

As expected, we observed a significantly younger median age at melanoma diagnosis in families with mutations than in families without mutations. This pattern was observed in all seven geographic locales. Overall, families with mutations had a median age at melanoma diagnosis 9 years earlier than families without mutations. Therefore, if a high-risk/high-penetrance susceptibility gene explains melanoma incidence in most of these families, median melanoma onset would be expected to be later than that seen for CDKN2A, ARF, or CDK4.

The familial predisposition to NST in most melanoma-prone families has not been elucidated to date. NST have been stated previously to be associated with large deletions and/or mutations that involve p14ARF but these studies were based on very small numbers of patients/families (17 as reported in ref. 57, 18–21). In contrast, in a recent study of 24 Jewish, mostly Ashkenazi, melanoma families with NST, examination of germ-line point mutations and genomic deletions at the CDKN2A/ARF and CDK4 loci revealed no alterations (58). Yet, the series included 10 (10 of 24) families, with at least two melanoma or two NST probands, suggesting the possibility of an inherited predisposition for development of melanoma and NST. Similarly, analysis of Swedish patients with multiple primary melanomas and NST was negative for the CDKN2A Swedish founder mutation p.R112_L113insR (or c.331_332insGTC; ref. 59). The current study adds to the growing evidence, indicating that there is no association between NST and CDKN2A mutations involving p16. However, the relationship between NST and ARF mutations remains unresolved. The evaluation of NST and ARF in the current study showed marginally significant evidence for an association between NST and ARF mutations (P = 0.05). But, evaluation of NST and all mutations that involved p14ARF (i.e., ARF splicing mutations and large deletions plus CDKN2A mutations that altered both p16 and p14ARF) did not show significant evidence for an association. Given the low frequency of ARF mutations, 3% in this large GenoMEL sample, much larger studies will be required to better understand the possible association between NST and mutations that alter the p14ARF protein.

As reported previously, there was a very strong association between PC in a family and the presence of a CDKN2A mutation (10–16). Similarly, the distribution of PC differed according to the specific common recurrent CDKN2A mutations (60). We attempted to evaluate the relationship between PC and whether the CDKN2A mutation altered only the p16 protein or both p16 and p14ARF proteins. However, the results were inconsistent. The patterns observed for all reported melanoma patients were similar to that seen when the analysis was restricted to patients with confirmed melanomas only (and consequently families with at least three confirmed CMM patients). That is, for both samples, "all reported melanoma patients" and "confirmed melanoma patients only," there were similar percentages of families with mutations that affected p16 only versus p16 and p14ARF among the families without reported PC. In contrast, among the families with PC, there were substantially different percentages of families in the two samples with mutations that affected p16 only versus p16 and p14ARF. However, the results were significant only for the "all reported melanoma patients" comparison; among the common recurrent CDKN2A mutations evaluated, two mutations (p.L32P and p.V126D) that do not involve p14ARF had PC reported in >40% of observed families with those mutations; in addition, one mutation (p.M53I) that alters p14ARF had only 10% of families observed to have PC. Additional studies are needed to further explore this association.

The current study had several limitations. The ascertainment and sampling of families at most GenoMEL centers was not population based. In addition, follow-up and extension of families differed across research centers. Furthermore, the study was restricted to melanoma-prone families with at least three CMM patients. Thus, given the possible differences between families with several melanoma cases and those with few cases, the results from the study may not be applicable to families with only one or two melanoma patients. In addition, no information about individual mutation status was provided for CMM, PC, NST, or UM patients. Finally, 10% of the patients with reported melanoma could not be confirmed. Similarly, 22% of the reported family members with PC, NST, or UM were not confirmed. Removal of the nonconfirmed melanoma patients (and their families) did not alter the types and/or distribution of mutations detected (data not shown). However, as discussed above, the association between mutations and PC differed depending on the inclusion of "all reported" compared with "only confirmed" cancer cases. Despite these limitations, this GenoMEL study provides the most informed assessment of the three high-risk melanoma susceptibility genes in multiple case (3 CMM patients) melanoma-prone families to date. Further, it shows the importance of consortium-based research for studies of rare susceptibility genes. In addition, this large familial melanoma data set is part of the ongoing search of GenoMEL for additional melanoma susceptibility genes, both high risk and low risk, using several strategies, including linkage, genome-wide association, and candidate gene approaches. Finally, future GenoMEL studies that include this data resource will hopefully lead to improved understanding and estimation of melanoma and nonmelanoma cancer risks in multiple case melanoma-prone families.

	Appendix A. Additional authors from GenoMEL listed by group/center

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Barcelona: Dermatology Department (J. Malvehy) and Genetics Service (C. Badenas and R. Cervera), Melanoma Unit, Hospital Clínic, Institut de Investigació Biomèdica August Pi Suñe (IDIBAPS), Universitat de Barcelona, Barcelona, Spain; Dermatology Department, Melanoma Unit, Hospital Clínic, IDIBAPS, Universitat de Barcelona, Barcelona, Spain and CONACYT, Mexico City, Mexico (Francisco Cuellar); Dermatology Department, Hospital Arnau de Vilanova, Universitat de Lleida, Lleida, Spain (Rosa Martí); Genetic Counseling of Cancer, Hospital Sant Joan, Universitat Rovira i Virgili, Reus, Spain; and Institut Català d’Oncologia, Hospital Trueta, Girona, Spain (Joan Brunet-Vidal). Boston: Massachusetts General Hospital, Boston, MA (Guang Yang). Brisbane: Queensland Institute of Medical Research (Nicholas Martin, David Whiteman, and Adele Green) and Queensland Cancer Fund, Brisbane, Australia (Joanne Aitken). Emilia-Romagna: Dermatology Unit, Maurizio Bufalini Hospital, Cesena, Italy (Paola Minghetti). Genoa: Dipartimento di Oncologia, Biologia e Genetica, Universita degli Studi di Genova, Vle Benedetto XV, 6, 16132 Genova, Italy (Michela Mantelli, Lorenza Pastorino, Sabina Nasti, and Sara Gargiulo) and Istituto Nazionale per la Ricerca sul Cancro, Largo Rosanna Benzi, 10, 16132 Genova, Italy (Sara Gliori). Leeds: Genetic Epidemiology Division, Cancer Research UK Clinical Centre, Leeds, United Kingdom (Sushila Mistry and Juliette Randerson-Moor). Leiden: Leiden University Medical Center, Leiden, the Netherlands (Wilma Bergman, Jeanet A.C. ter Huurne, Clasine van der Drift, Leny van Mourik, Coby Out-Luiting, and Frans van Nieuwpoort). Paris: INSERM U794, Université d'Evry, Evry, France (Valerie Chaudru); Service de Génétique, Institut Gustave Roussy, Villejuif, France (Agnes Chompret and Caroline Kanengiesser); and French Hereditary Melanoma Study Group: Drs. J.L. Michel, F. Grange, B. Sassolas, J.M. Limacher, D. Couillet, F. Truchetet, J.P. Cesarini, F. Boitier, J. Chevrant-Breton, C. Lasset, M. Longy, P. Joly, N. Basset-Seguin, T. Lesimple, and C. Dugast. Philadelphia: Department of Genetics (Arupa Ganguly), Department of Dermatology (Michael Ming), Department of Pathology and Laboratory Medicine (Patricia Van Belle), University of Pennsylvania, Philadelphia, PA. Stockholm: Department of Oncology-Pathology, Karolinska Institute and Karolinska University Hospital Solna, Stockholm, Sweden (Anton Platz, Suzanne Egyhazi, Rainer Tuominen, and Diana Linden). Sydney: Westmead Institute for Cancer Research, Sydney, New South Wales, Australia (Helen Schmid). Tel-Aviv: Department of Dermatology (Alon Scope and Felix Pavlotsky), Susanne Levy Oncogenetics Unit (Eitan Friedman), Sheba Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Israel. Utah: Department of Dermatology and Huntsman Cancer Institute, University of Utah School of Medicine, Salt Lake City, UT (Mark Eliason).

	Appendix B. Authors from Lund Melanoma Study Group

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Lund Cancer Center Department of Oncology, University Hospital, Lund, Sweden (Christian Ingvar, Ake Borg, Johan Westerdahl, Anna Masback, and Hakan Olsson).

	Acknowledgments

 
Grant support: Intramural Research Program of the NIH, NCI, Division of Cancer Epidemiology and Genetics, and National Human Genome Research Institute; NCI research grant 1 RO1 CA83115-01A2 "Genetic epidemiology of melanoma" (D.E. Elder); NCI grant RO1 CA 88363 (N.K. Hayward) and National Health and Medical Research Council of Australia (Brisbane group); NCI grant R01 CA102422 (L.A. Cannon Albright), Tom C. Mathews, Jr. Familial Melanoma Research Clinic, and Huntsman Cancer Foundation (Utah group); Cancer Research UK (Leeds group); Fondo de Investigaciones Sanitarias grants 01/1546 and 03/0019, personal scholarship 152256/158706, Mexico City, Mexico [Francisco Cuellar, Consejo Nacional de Ciencia y Tecnología (CONACYT), Mexico City, Mexico], and personal scholarship 152256/158706 (Barcelona group); regional grant N.763/2004 (Genova, Italy); Swedish Cancer Society research grants 4860-B05-03XAC and 5012-B05-01PAF, Swedish Research Council research grant K2006-74X-20141-01-3, and Radiumhemmet Research Funds grants (J Hansson; Stockholm group); Swedish Cancer Society (Lund group); Programme Hospitalier de Recherche Clinique Règional d'Ile de France grant AOR 01 091 (M-F. Avril; Paris group); Australian National Health and Medical Research Council research grants and scholarships (G.J. Mann and R.F. Kefford), The Cancer Councils of Australia, Australian Cancer Research Foundation, and Melanoma Foundation and Cancer Research Fund of the University of Sydney (Sydney group); and NCI Preventive Oncology Academic Award (K07 CA80700; P.A. Kanetsky). Some data collected for this publication were assisted by the Utah Cancer Registry supported by NIH contract NO1-PC-35141, SEER Program, with additional support from the Utah Department of Health and the University of Utah. Partial support for all data sets within the Utah Population Database was provided by the University of Utah Huntsman Cancer Institute.

The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

We thank the participating families, whose generosity and cooperation have made this study possible, the nurses, doctors (including Dr. Emma D'Andrea at the University of Padova, Padova, Italy), scientists, and other health professionals who referred and/or evaluated melanoma patients and families for this study.

	Footnotes

 
²⁷ http://www.hgmd.org.

²⁸ Australian Bureau of Statistics: http://www.abs.gov.au/Ausstats/abs@.nsf/0/b85e1eb3a2bc274aca256d39001bc337?OpenDocument.

²⁹ M. Harland, A.M. Goldstein, K. Kukalizch, C. Taylor, D. Hogg, S. Puig, C. Badenas, N.A. Gruis, J.A.C. ter Huurne, W. Bergman, N.K. Hayward, M. Stark, H. Tsao, M.A. Tucker, M.T. Landi, G. Bianchi-Scarra, P. Ghiorzo, P.A. Kanetsky, D.E. Elder, G.J. Mann, E.A. Holland, D.T. Bishop, J. Newton Bishop, and members of GenoMEL, the Melanoma Genetics Consortium. CDKN2A mutation audit within the Melanoma Genetics Consortium (GenoMEL) reveals a high standard of screening across participating centres. Submitted for publication.

Received 2/ 8/06. Revised 7/10/06. Accepted 8/ 4/06.

	References

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