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Melanoma-prone families: new evidence of distinctive clinical and histological features of melanomas in CDKN2A mutation carriers

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Abstract

Germline mutations on the CDKN2A gene, the most important known genetic factors associated with cutaneous melanomas (CMs), predispose carriers to multiple primary CMs (MPMs) with higher frequency and younger onset compared to non-carriers. Most of the largest published studies concerning clinical and histological characteristics of CMs with CDKN2A mutation carriers did not specify if the described CMs are first or subsequent to the first, and they used sporadic CMs from non-genotyped patients as controls. We conducted a single-centre observational study to compare clinical and histological CM features of 32 unrelated carriers (MUT) of 5 germline CDKN2A mutations (one of which was never previously described) compared to 100 genotyped wild-type (WT) patients. We stratified the data based on time of diagnosis, anatomical site and histological subtype of CMs, demonstrating several significant unreported differences between the two groups. MUT developed a higher number of dysplastic nevi and MPMs. We proved for the first time that anatomical distribution of CMs in MUT was independent of gender, unlike WTs. MUTs developed in situ and superficial spreading melanomas (SSMs) more frequently, with significantly higher number of SSMs on the head/neck. In MUTs, Breslow thickness was significantly lower for all invasive CMs. When CMs were stratified on the basis of the time of occurrence, statistical significance was maintained only for SSMs subsequent to the first. In WTs, Clark level was significantly higher, and ulceration was more prevalent than in MUTs. Significant differences in ulceration were observed only in SSMs. In nodular CMs, we did not find differences in terms of Breslow thickness or ulceration between WTs and MUTs. In situ CMs developed 10 years earlier in MUTs with respect to WTs, whereas no significant differences were observed in invasive CMs. In contrast to those reported previously by other authors, we did not find a difference in skin phototype.

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Abbreviations

CM:

Cutaneous melanoma

PC:

Pancreatic cancer

MUT:

Carrier of CDKN2A germline mutation

WT:

Wild type

UM:

Uveal melanoma

FCS:

Familial cancer syndrome

N_CM1:

First CM

N_CM1.5:

CM diagnosed within 3 months after the first (metachronous CM)

MPMs:

Multiple primary melanomas

SLNB:

Sentinel node biopsy

y:

Years

SNM:

Sentinel node metastases.

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Authors and Affiliations

  1. Department of Health Sciences, A. Avogadro University of Eastern Piedmont, Corso Mazzini 18, 28100, Novara, Italy

    Laura Cristina Gironi, Roberto Giorgione, Pamela Farinelli, Francesca Zottarelli, Elia Esposto, Elisa Zavattaro, Marta Betti, Irma Dianzani & Paola Savoia

  2. Department of Translational Medicine, A. Avogadro University of Eastern Piedmont, Novara, Italy

    Enrico Colombo

  3. Department of Medical Sciences, University of Turin, Turin, Italy

    Barbara Pasini & Paola Ogliara

  4. NIHR Blood and Transplant Research Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK

    Elias Allara

Authors
  1. Laura Cristina Gironi
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  2. Enrico Colombo
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  3. Barbara Pasini
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  4. Roberto Giorgione
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Corresponding author

Correspondence to Laura Cristina Gironi.

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Conflict of interest

All authors declare that they have no conflict of interest.

Ethical approval(Research involving Human Participants)

This study obtained approval from the Ethics Committee of our Institution (Comitato Etico Interaziendale, Azienda Ospedaliero Universitaria Maggiore della Carità di Novara, Italy).

Informed consent

Written informed consent for genetic analysis was obtained from all patients.

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Gironi, L.C., Colombo, E., Pasini, B. et al. Melanoma-prone families: new evidence of distinctive clinical and histological features of melanomas in CDKN2A mutation carriers. Arch Dermatol Res 310, 769–784 (2018). https://doi.org/10.1007/s00403-018-1866-0

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  • DOI: https://doi.org/10.1007/s00403-018-1866-0

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