Mutational profiling of acral melanomas in Korean populations.

Abstract:

:The proportion of acral melanoma (AM) is much higher in Asian populations than in Caucasian populations. Although mutational profiles associated with AM have been discovered in Caucasian populations, knowledge of its genetic alterations in Asian populations is limited. To describe the molecular nature of AM in Korean patients, we performed mutational profiling of AM and matched normal tissues in patients. Fifty-one formalin-fixed paraffin-embedded AM samples and 32 matched pairs from patients' saliva DNA were analysed by next-generation sequencing. Only mutations confirmed via digital droplet PCR or in BRAF, KIT and NRAS, the most frequently altered cancer genes in cutaneous melanoma, were considered as positive. The relationship between mutational status and clinicopathological features were examined. Of the 47 AM patients screened, alteration of BRAF, NRAS and KIT genes was observed in 6.4%, 4.3% and 8.5%, respectively. We also tested matched normal tissues of patients to identify tumor-specific mutations. Examination of the mutational profile in a cohort of 28 primary melanomas and matched normal controls found BRAF mutations in two cases (7.1%), KIT mutations in three cases (10.7%) and CTNNB1 mutations in one case (3.6%). The BRAF, NRAS and KIT mutation status did not correlate with clinicopathological characteristics. Our results show that KIT, NRAS and BRAF hotspot mutations occur at a low frequency in Korean populations. We also observed a case with the CTNNB1 mutation, which raises the possibility that other pathways are associated with AM development.

journal_name

Exp Dermatol

journal_title

Experimental dermatology

authors

Shim JH,Shin HT,Park J,Park JH,Lee JH,Yang JM,Kim DH,Jang KT,Lee DY

doi

10.1111/exd.13321

subject

Has Abstract

pub_date

2017-10-01 00:00:00

pages

883-888

issue

10

eissn

0906-6705

issn

1600-0625

journal_volume

26

pub_type

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