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This guideline was developed in close collaboration with multidisciplinary experts from the European Association of Dermato-Oncology (EADO), the European Dermatology Forum (EDF) and the European Organization for Research and Treatment of Cancer (EORTC). Recommendations for the diagnosis and treatment of melanoma were developed on the basis of systematic literature research and consensus conferences. Cutaneous melanoma (CM) is the most dangerous form of skin tumor and accounts for 90 % of skin cancer mortality. The diagnosis of melanoma can be made clinically and must always be confirmed by dermoscopy. If melanoma is suspected, a histopathological examination is always required. Sequential digital dermoscopy and whole-body photography can be used in high-risk patients to improve the detection of early-stage melanoma. If available, confocal reflectance microscopy can also improve the clinical diagnosis in special cases. Melanoma is classified according to the 8th version of the American Joint Committee on Cancer classification. For thin melanomas up to a tumor thickness of 0.8 mm, no further diagnostic imaging is required. From stage IB, lymph node sonography is recommended, but no further imaging examinations. From stage IIB/C, whole-body examinations with computed tomography or positron emission tomography CT in combination with magnetic resonance imaging of the brain are recommended. From stage IIB/C and higher, a mutation test is recommended, especially for the BRAF V600 mutation. It is important to perform a structured follow-up to detect relapses and secondary primary melanomas as early as possible. A stage-based follow-up regimen is proposed, which in the experience of the guideline group covers the optimal requirements, although further studies may be considered. This guideline is valid until the end of 2026., Competing Interests: Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Dr. Amaral reports personal fees for advisory board membership from Delcath and Philogen; personal fees as an invited speaker from BMS, Neracare, Novartis and Pierre Fabre; personal fees for a writing engagement from CeCaVa and Medtrix; institutional fees as local principal investigator (PI) from Agenus Inc., AstraZeneca, BioNTech, BMS, HUYA Bioscience, Immunocore, IO Biotech, MSD, Pfizer, Philogen, Regeneron, Roche and University Hospital Essen; institutional fees as coordinating PI from Unicancer; institutional research grants from iFIT and Novartis; institutional funding from MNI - Naturwissenschaftliches und Medizinisches Institut, Neracare, Novartis, Pascoe, Sanofi and Skyline-Dx; non-remunerated membership of the American Society of Clinical Oncology (ASCO) and the Portuguese Society for Medical Oncology; and a role as clinical expert in the area of medical oncology for Infarmed. Dr. Arenberger reports personal fees from BMS, personal fees from MSD, personal fees from Novartis, personal fees from Sanofi, outside the submitted work. Dr Basset-Seguin has nothing to disclose. Dr. Bastholt reports personal fees for advisory boards from Bristol Myers-Squibb, Pierre Fabre, Merck MSD, Novartis and Roche, outside the submitted work. Dr. Bataille has nothing to disclose. Dr. Brochez has nothing to disclose. Dr. del Marmol reports grants and personal fees from BMS, grants and personal fees from SANOFI, personal fees from LEO Pharma, grants and personal fees from ALMIRALL, outside the submitted work. Dr. Dreno reports personal fees from MSD, grants and personal fees from BMS, grants and personal fees from Roche, grants and personal fees from Fabre, outside the submitted work. A. Eggermont Consultant for: Agenus, Boehringer Ingelheim, BioInvent, BioNTech, Brenus, CatalYm, Eurobio, GenOway, IO Biotech, Imcheck, IQVIA, Merck&Co/MSD, Pfizer, QBiotics, Regeneron, Sairopa BV, ScanCell, Scorpion Therapeutics, Secarna, SkylineDx BV, Thermosome, Trained Immunity Discovery Speaker engagements: Merck/MSD, SkylineDx BVEquity: IO Biotech, Sairopa BV, SkylineDX BV. Dr. Fargnoli reports grants and personal fees from Almirall, personal fees from Leo Pharma, grants and personal fees from Janssen, personal fees from Novartis, personal fees from Lilly, personal fees from Sanofi, personal fees from UCB, personal fees from Abbvie, personal fees from AMGEN, personal fees from Pierre Fabre, grants and personal fees from Galderma, personal fees from Sun Pharma, personal fees from BMS, personal fees from Kyowa Kyrin, personal fees from Pfizer, personal fees from MSD, outside the submitted work. Dr. Forsea has nothing to disclose. Dr. Garbe reports personal fees from CeCaVa, personal fees from MSD, personal fees from NeraCare, personal fees from Philogen, outside the submitted work. Dr. Hauschild reports grants and personal fees from Amgen, grants and personal fees from BMS, grants and personal fees from MerckPfizer, grants and personal fees from MSD/Merck, grants and personal fees from Philogen, grants and personal fees from Pierre Fabre, grants and personal fees from Regeneron, personal fees from Roche, grants and personal fees from Sanofi-Genzyme, grants and personal fees from Novartis Pharma, personal fees from Eisai, personal fees from Immunocore, grants and personal fees from Replimune, personal fees from Seagen, personal fees from IO Biotech, personal fees from Dermagnostix, personal fees from Incyte, grants and personal fees from NeraCare, grants from Huya Biosciences, personal fees from Kyowa Kirin, personal fees from Highlight Therapeutics, personal fees from Iovance, personal fees from CureVac, personal fees from Xenthera, peronal fees from Agenus, personal fees from Almirall, and personal fees from Sun Pharma, outside the submitted work. Dr. Hoeller reports personal fees from Amgen, personal fees from Almirall, personal fees from BMS, personal fees from MSD, personal fees from Novartis, personal fees from Pierre Fabre, personal fees from Roche, personal fees from Sanofi, outside the submitted work. Dr. Kandolf reports personal fees for advisory boards from Bristol Myers-Squibb, MSD, Novartis Roche, Janssen, Abbvie, outside the submitted work. Dr. Kaufmann reports other from Abbvie, other from Almirall, other from Amgen, other from Astra Zeneca, other from Bionteck, other from BMS, other from Galderma, other from Incyte, other from Janssen, other from Leo, other from MSD, other from Novartis, other from Pfizer, other from Roche, other from Sanofi, outside the submitted work. Dr. Kelleners-Smeets reports personal fees from Sanofi, personal fees from Novartis, personal fees from MSD, personal fees from Sun Pharma, outside the submitted work. Dr. Lallas reports personal fees from Avene, personal fees from MSD, personal fees from Regeneron, personal fees from BMS, outside the submitted work. Dr. Lebbe reports personal fees from MSD, personal fees from Pierre Fabre, personal fees from BMS, personal fees from Sanofi, personal fees from immunocore, outside the submitted work. Dr. Leiter reports personal fees from Regeneron, Sanofi, personal fees from MSD, personal fees from Novartis, Almirall Hermal, personal fees from Sun Pharma, outside the submitted work. Dr. Longo has nothing to disclose. Dr. Lorigan reports grants and personal fees from Pierre Fabre, personal fees from MSD, grants and personal fees from BMS, personal fees from MLA diagnostics, outside the submitted work. Dr. Malvehy reports grants and personal fees from Almirall, personal fees from MSD, personal fees from Pierre Fabre, grants from Philogen, grants from Castle biosciences, grants from BMS, grants and personal fees from ISDIN, grants and personal fees from La Roche Posay, non-financial support and other from Vivascope, non-financial support and other from Damae medical, non-financial support and other from Canfield, non-financial support and other from Fotofinder, outside the submitted work. Dr. Mandala reports personal fees from BMS, personal fees from MSD, personal fees from Novartis, personal fees from Regeneron, personal fees from Sun Pharma, outside the submitted work. Dr. Moreno-Ramírez has nothing to disclose. Dr. Nathan reports personal fees from Novartis, grants and personal fees from Immunocore, personal fees from BMS, personal fees from SunPharma, personal fees from MSD, outside the submitted work; Dr. Pellacani has nothing to disclose. Dr. Peris reports personal fees from Abbvie, personal fees from Lilly, personal fees from Leo Pharma, personal fees from Sanofi, personal fees from Almirall, personal fees from Novartis, personal fees from Boehringer, personal fees from Amgen, outside the submitted work. Dr. Saiag reports personal fees from Novartis, MSD, NeraCare, BMS, Pierre Fabre, Merck, personal fees and grants from Damae Medical, outside the submitted work. Dr. Stockfleth has nothing to disclose. Dr. Stratigos reports personal fees from Sanofi, personal fees from Janssen CILAG, personal fees and non-financial support from Novartis, grants from Genesis Pharma, grants from Abbvie, grants and personal fees from BMS, personal fees from Regeneron, grants from Leo-Pharma, grants from Lilly, outside the submitted work. Dr. van Akkooi reports grants and personal fees from Amgen, personal fees from Bristol-Myers Squibb, personal fees from Novartis, personal fees from MSD-Merck, grants and personal fees from Merck-Pfizer, personal fees from Pierre Fabre, personal fees from Sanofi, personal fees from Sirius Medical, personal fees from 4SC, personal fees from Genmab, personal fees from Menarini Silicon Biosystems, from Skyline Dx, outside the submitted work. Dr. Vieira has nothing to disclose. Dr. Zalaudek reports personal fees from Philogen, personal fees from MSD, personal fees from Novartis, personal fees from Sanofi, personal fees from La Roche Posay, personal fees from Sunpharma, personal fees from Biogena, personal fees from Cieffe Derma, outside the submitted work., (Copyright © 2024. Published by Elsevier Ltd.)

Cutaneous melanoma (CM) is potentially the most dangerous form of skin tumor and causes 90% of skin cancer mortality. A unique collaboration of multi-disciplinary experts from the European Dermatology Forum (EDF), the European Association of Dermato-Oncology (EADO) and the European Organization for Research and Treatment of Cancer (EORTC) was formed to make recommendations on CM diagnosis and treatment, based on systematic literature reviews and the experts' experience. The diagnosis of melanoma can be made clinically and shall always be confirmed with dermatoscopy. If a melanoma is suspected, a histopathological examination is always required. Sequential digital dermatoscopy and full body photography can be used in high-risk patients to improve the detection of early melanoma. Where available, confocal reflectance microscopy can also improve clinical diagnosis in special cases. Melanoma shall be classified according to the 8th version of the American Joint Committee on Cancer classification. Thin melanomas up to 0.8 mm tumor thickness do not require further imaging diagnostics. From stage IB onwards, examinations with lymph node sonography are recommended, but no further imaging examinations. From stage IIC onwards whole-body examinations with computed tomography (CT) or positron emission tomography CT (PET-CT) in combination with brain magnetic resonance imaging are recommended. From stage III and higher, mutation testing is recommended, particularly for BRAF V600 mutation. It is important to provide a structured follow-up to detect relapses and secondary primary melanomas as early as possible. There is no evidence to define the frequency and extent of examinations. A stage-based follow-up scheme is proposed which, according to the experience of the guideline group, covers the optimal requirements, but further studies may be considered. This guideline is valid until the end of 2024., Competing Interests: Conflict of interest statement Dr. Garbe reports personal fees from Amgen, personal fees from MSD, grants and personal fees from Novartis, grants and personal fees from NeraCare, grants and personal fees from BMS, personal fees from Philogen, grants and personal fees from Roche, grants and personal fees from Sanofi, outside the submitted work. Dr. Amaral reports intitutional grants and personal fees from Novartis, institutional grants from NeraCare, personal fees from BMS, institutional grants from Sanofi, institutional grants from SkylineDx, personal fees from CeCaVa, personal fees from Pierre Fabre, outside the submitted work. Dr. Peris reports personal fees from Novartis, personal fees from Roche, personal fees from Sanofi, personal fees from Lilly, personal fees from Leopharma, personal fees from Pierre Fabre, personal fees from Almirall, personal fees from Celgene, outside the submitted work. Dr. Hauschild reports grants and personal fees from Amgen, grants and personal fees from BMS, grants and personal fees from Eisai, grants and personal fees from Immunocore, grants and personal fees from MerckPfizer, grants and personal fees from MSD/Merck, grants and personal fees from Novartis Pharma, grants and personal fees from Philogen, grants and personal fees from Pierre Fabre, grants and personal fees from Regeneron, grants and personal fees from Replimune, grants and personal fees from Roche, grants and personal fees from Sanofi-Genzyme, grants and personal fees from Seagen outside the submitted work. Dr. Arenberger reports personal fees from Amgen, personal fees from MSD, personal fees from Novartis, personal fees from BMS, grants and personal fees from Pfizer, personal fees from Sanofi, outside the submitted work. Dr Basset-Seguin has nothing to disclose. Dr. Bastholt reports personal fees for advisory boards from Bristol Myers-Squibb, Pierre Fabre, Merck MSD, Novartis and Roche, outside the submitted work. Dr. Bataille has nothing to disclose. Dr. del Marmol reports grants and personal fees from BMS, grants and personal fees from SANOFI, personal fees from Merck, grants and personal fees from almirall, personal fees from ABBVIE, personal fees from LEO pharma, personal fees from SUN Pharma, personal fees from Genzyme, outside the submitted work. Dr. Dréno reports grants and personal fees from BMS, personal fees from MSD, grants and personal fees from Roche, grants and personal fees from Fabre, grants and personal fees from Sanofi, outside the submitted work. Dr. Fargnoli reports grants, personal fees and non-financial support from Almirall, grants and personal fees from Leo Pharma, grants and personal fees from Janssen, grants, personal fees and non-financial support from Novartis, personal fees from Lilly, grants and personal fees from Sanofi, personal fees from UCB, personal fees from Abbvie, grants, personal fees and non-financial support from AMGEN, personal fees from Pierre Fabre, grants and personal fees from Galderma, personal fees from Sun Pharma, personal fees from BMS, personal fees from Kyowa Kyrin, personal fees from Pfizer, personal fees from MSD, outside the submitted work. Dr. Forsea has nothing to disclose. Dr. Grob reports personal fees from Amgen, personal fees from MSD, personal fees from Novartis, grants and personal fees from Pierre Fabre, grants and personal fees from BMS, personal fees from Philogen, personal fees from Roche, personal fees from Sanofi, outside the submitted work. Dr. Hoeller reports personal fees from Amgen, personal fees from Almirall, personal fees from BMS, personal fees from MSD, personal fees from Novartis, personal fees from Pierre Fabre, personal fees from Roche, personal fees from Sanofi, outside the submitted work. Dr. Kaufmann reports grants from Abbvie, grants from Almirall, grants from Amgen, grants from Astra Zeneca, grants from Biontech, grants from BMS, grants from BMS, grants from Celgene, grants from InflaRx, grants from Leo, grants from Lilly, grants from MSD, grants from Novartis, grants from Pfizer, grants from Pierre Fabre, grants from Regeneron, grants from Roche, grants from Sanofi, grants from UCB, outside the submitted work. Dr. Kelleners-Smeets has nothing to disclose. Dr. Lallas reports grants and personal fees from Sanofi, outside the submitted work. Dr. Lebbé reports grants and personal fees from Bristol-Myers Squibb, personal fees from MSD, personal fees from Novartis, personal fees from Amgen, grants and personal fees from Roche, personal fees from Avantis Medical Systems, personal fees from Pierre Fabre, personal fees from Pfizer, personal fees from Incyte, outside the submitted work. Dr. Lytvynenko has nothing to disclose. Dr. Malvehy reports grants and personal fees from Amgen, personal fees from MSD, grants and personal fees from Novartis, grants and personal fees from BMS, grants and personal fees from Almirall, personal fees from Sunpharma, personal fees from Pierre Fabre, outside the submitted work. Dr. Moreno-Ramirez has nothing to disclose. Dr. Nathan reports personal fees from BMS, personal fees from MSD, personal fees from Novartis, personal fees from Pfizer, grants and personal fees from Immunocore, personal fees from 4SC, outside the submitted work. Dr. Pellacani reports personal fees from Novartis, personal fees from Sanofi, grants from Novartis, instruments from 3Gen, Vidix, Fotofinder and MAVIG GmbH, outside the submitted work. Dr. Saiag reports personal fees from Amgen, personal fees from MSD, grants and personal fees from Novartis, grants and personal fees from NeraCare, grants and personal fees from BMS, grants and personal fees from Roche, grants and personal fees from Sanofi, personal fees from Pierre Fabre/array, outside the submitted work. Dr. Stratigos reports personal fees from Sanofi, personal fees from Janssen CILAG, personal fees and non-financial support from Novartis, grants from Genesis Pharma, grants from Abbvie, grants and personal fees from BMS, personal fees from Regeneron, grants from Leo-Pharma, grants from Lilly, outside the submitted work. Dr. van Akkooi reports grants and personal fees from Amgen, personal fees from Bristol-Myers Squibb, personal fees from Novartis, personal fees from MSD-Merck, grants and personal fees from Merck-Pfizer, personal fees from Pierre Fabre, personal fees from Sanofi, personal fees from Sirius Medical, personal fees from 4SC, outside the submitted work. Dr. Vieira reports personal fees from BMS, outside the submitted work. Dr. Zalaudek reports personal fees from Philogen, personal fees from MSD, personal fees from Novartis, personal fees from Sanofi, personal fees from La Roche Posay, personal fees from Sunpharma, personal fees from Biogena, personal fees from Cieffe Derma, outside the submitted work. Dr. Lorigan has nothing to disclose., (Copyright © 2022 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Cutaneous melanoma (CM) is potentially the most dangerous form of skin tumor and causes 90% of skin cancer mortality. A unique collaboration of multidisciplinary experts from the European Dermatology Forum (EDF), the European Association of Dermato-Oncology (EADO), and the European Organization of Research and Treatment of Cancer (EORTC) was formed to make recommendations on CM diagnosis and treatment, based on systematic literature reviews and the experts' experience. The diagnosis of melanoma can be made clinically and shall always be confirmed through dermatoscopy. If a melanoma is suspected, a histopathological examination is required. Sequential digital dermatoscopy and full-body photography can be used in risk persons to detect the development of melanomas at an earlier stage. Where available, confocal reflectance microscopy can improve clinical diagnosis in special cases. Melanoma shall be classified according to the 8th version of the AJCC classification. Thin melanomas up to 0.8 mm tumor thickness does not require further imaging diagnostics. From stage IB onwards, examinations with lymph node sonography are recommended, but no further imaging examinations. From stage IIC whole-body examinations with CT or PET-CT in combination with brain MRI are recommended. From stage III and higher, mutation testing is recommended, particularly for BRAF V600 mutation. It is important to provide a structured follow-up to detect relapses and secondary primary melanomas as early as possible. There is no evidence to support the frequency and extent of examinations. A stage-based follow-up scheme is proposed, which, according to the experience of the guideline group, covers the minimum requirements; further studies may be considered. This guideline is valid until the end of 2021., Competing Interests: Conflict of interest statement Dr. Garbe reports personal fees from Amgen, personal fees from MSD, grants and personal fees from Novartis, grants and personal fees from NeraCare, grants and personal fees from BMS, personal fees from Pierre Fabre, personal fees from Philogen, grants and personal fees from Roche, grants and personal fees from Sanofi, outside the submitted work. Dr. Amaral reports personal fees and other from BMS, grants, personal fees, and others from Novartis, personal fees from Pierre Fabre, grants from Neracare, grants from Sanofi, outside the submitted work. Dr. Peris reports personal fees from Novartis, personal fees from Roche, personal fees from Sanofi, personal fees from Lilly, personal fees from Leopharma, personal fees from Pierre Fabre, personal fees from Almirall, personal fees from Celgene, outside the submitted work. Dr. Hauschild reports grants and personal fees from Amgen, grants and personal fees from BMS, grants and personal fees from MerckSerono, grants and personal fees from MSD/Merck, grants and personal fees from Philogen, grants and personal fees from Pierre Fabre, grants and personal fees from Provectus, grants and personal fees from Regeneron, grants and personal fees from Roche, personal fees from OncoSec, grants and personal fees from Sanofi-Genzyme, personal fees from Sun Pharma, grants and personal fees from Novartis Pharma outside the submitted work. Dr. Arenberger reports personal fees from Amgen, personal fees from MSD, personal fees from Novartis, personal fees from BMS, personal fees from Roche, outside the submitted work. Dr. Bastholt reports grants from BMS, during the conduct of the study; personal fees from BMS, personal fees from Novartis, personal fees from Merck MSD, personal fees from Roche, personal fees from Incyte, personal fees from Bayer, outside the submitted work. Dr. Bataille reports personal fees from Novartis, personal fees from Merck MSD, outside the submitted work. Dr. del Marmol reports personal fees from MSD, from BMS, personal fees from Sanofi, grants and personal fees from ABVIE, grants from Jansen, outside the submitted work. Dr. Dréno reports grants and personal fees from BMS, personal fees from MSD, grants and personal fees from Roche, grants and personal fees from Fabre, grants and personal fees from Sanofi, outside the submitted work. Dr. Fargnoli reports grants and personal fees from Almirall, grants and personal fees from Leo Pharma, personal fees from Janssen, grants and personal fees from Novartis, personal fees from Lilly, grants and personal fees from Sanofi, personal fees from UCB, grants and personal fees from Abbvie, personal fees from Celgene, personal fees from Pierre Fabre, grants and personal fees from Galderma, personal fees from Mylan, personal fees from Medac Pharma, personal fees from Roche, personal fees from Sun Pharma, outside the submitted work. Dr. Grob reports personal fees from Amgen, personal fees from MSD, personal fees from Novartis, personal fees from BMS, personal fees from Roche, personal fees from Pierre fabre, personal fees from MercK/Pfizer, outside the submitted work. Dr. Hoeller reports personal fees from Amgen, personal fees from MSD, personal fees from Novartis, personal fees from Incyte, personal fees from BMS, personal fees from Pierre Fabre, personal fees from Roche, personal fees from Sanofi, outside the submitted work. Dr. Kaufmann reports grants and personal fees from Novartis and Roche, and grants from AbbVie, Amgen, Bionteck, BMS, Celgene, Galderma, Janssen, Leo, Lilly, Merck, MSD, Pierre Fabre, Regeneron, and Wyeth, outside the submitted work. Dr. Lallas reports personal fees from Amgen, personal fees from Novartis, personal fees from BMS, grants and personal fees from Roche, personal fees from Sanofi, outside the submitted work. Dr. Lebbe reports grants and personal fees from Bristol-Myers Squibb, personal fees from MSD, personal fees from Novartis, personal fees from Amgen, grants and personal fees from Roche, personal fees from Avantis Medical Systems, personal fees from Pierre Fabre, personal fees from Pfizer, personal fees from Incyte, outside the submitted work. Dr. Malvehy reports personal fees from Amgen, personal fees from MSD, grants from Novartis, grants and personal fees from BMS, grants and personal fees from Roche, grants and personal fees from Almirall, personal fees from Sun Pharma, outside the submitted work. Dr. Middleton reports personal fees from Amgen, grants and personal fees from Roche, grants from Astrazeneca, grants and personal fees from GSK, personal fees and other from Novartis, other from Millennium, personal fees, non-financial support and other from Immunocore, personal fees and other from BMS, personal fees and other from Eisai, other from Pfizer, personal fees, non-financial support and other from Merck/MSD, personal fees and other from Rigontec (acquired by MSD), other from Regeneron, personal fees from BiolineRx, personal fees and other from Array Biopharma (now Pfizer), non-financial support and other from Replimune, outside the submitted work. Dr. Moreno-Ramírez has nothing to disclose. Dr. Pellacani reports personal fees from Novartis, personal fees from Sanofi, grants from Novartis, instruments from 3 Gen, Vidix, Fotofinder and MAVIG GmbH, outside the submitted work. Dr. Saiag reports personal fees from Amgen, personal fees from MSD, grants and personal fees from Novartis, grants and personal fees from NeraCare, grants and personal fees from BMS, grants and personal fees from Roche, grants and personal fees from Sanofi, personal fees from Pierre Fabre/array, outside the submitted work. Dr. Stratigos reports personal fees and/or research support from Novartis, Roche, BMS, Abbvie, Sanofi, Regeneron, Genesis Pharma, outside the submitted work. Dr. Vieira has nothing to disclose. Dr. Zalaudek reports personal fees from Difa Cooper, personal fees from MSD, personal fees from Novartis, grants and personal fees from Roche, personal fees from Sanofi, personal fees from Almirall Hermal, personal fees from Mylan, personal fees from Sunpharma, outside the submitted work. Dr. Eggermont reports personal fees from Biocad, Biovent, BMS, CatalYm, Ellipses, GSK, Incyte, IO Biotech, ISA Pharmaceuticals, Merck GmbH, MSD, Novartis, Pfizer, Polynoma, Regeneron, Sanofi, SkylineDx, Stellas, other from RiverD, SkylineDx, Theranovir, all outside the submitted work., (Copyright © 2019. Published by Elsevier Ltd.)

Background: Xeroderma pigmentosum (XP) is a genodermatosis caused by abnormal DNA repair. XP complementation group C (XPC) is the most frequent type in Mediterranean countries. We describe a case with a novel mutation in the XPC gene.Case: A healthy Caucasian male patient was diagnosed with multiple primary melanomas. Digital follow-up and molecular studies were carried out.Results: During digital follow-up 8 more additional melanomas were diagnosed. Molecular studies did not identify mutations in CDKN2A, CDK4 or MITF genes. Two heterozygous mutations in the XPC gene were detected: c.2287delC (p.Leu763Cysfs*4) frameshift and c.2212A>G (p.Thr738Ala) missense mutations.Conclusion: The p.Thr738Ala missense mutation has not been previously described. Missense mutations in the XPC gene may allow partial functionality that could explain this unusual late onset XP. Atypical clinical presentation of XPC could be misdiagnosed when genetic aberrations allow partial DNA repair capacity. [ABSTRACT FROM AUTHOR]