The risk of hereditary cutaneous malignant melanoma was evaluated in 401 members of 14 families with an autosomal dominant form of melanoma. We documented 127 primary melanomas in 69 famil...

High Risk of Malignant Melanoma in Melanoma-Prone Families with Dysplastic Nevi

Dysplastic naevi and cutaneous melanoma risk

Dysplastic melanocytic nevi (DMN) are irregularly pigmented lesions characterized by (1) atypical melanocytic hyperplasia in a lentiginous epidermal pattern (AMHL), (2) one or more dermal mesenchymal changes, and (3) frequently a dermal nevocellular nevus. In order to determine an association between DMN and cutaneous melanoma, the dominant histologic feature of DMN (namely, AMHL) was sought in histologic contiguity with 234 primary melanomas. Of these 234 cases, 9 were lentigo maligna melanomas. Of the remaining 225 cases, 49 (21.8%) were associated with AMHL in the same histologic section as (but beyond the most lateral margin of) intraepidermal and invasive melanoma. AMHL was directly associated with the presence of dermal nevocellular nevi in histologic contiguity with melanoma, and a greater number of histologic slides with melanoma available for review. AMHL was inversely associated with nodular melanoma. Most of the AMHL cases were not associated with familial melanoma, but the total number of familial cases was low. The histologic association between AMHL and melanoma in one fifth of cases in this series supports the hypothesis that at least some cutaneous melanomas may have an origin in DMN.

Dysplastic melanocytic nevi in histologic association with 234 primary cutaneous melanomas

Segregation and linkage analyses were undertaken in families with multiple cases of cutaneous malignant melanoma (CMM) and a recently-described melanoma precursor, the dysplastic nevus syndrome (DNS). Clinical and laboratory data, including 23 genetic markers, were collected on 401 members of 14 high-risk kindreds. Pedigree analysis was compatible with an autosomal dominant mode of inheritance for the familial CMM trait. Although a similar model probably applies to the DNS trait as well, segregation analysis could not confirm the presence of a major locus. However, linkage analysis suggested that an autosomal dominant model was appropriate for the DNS, and that a DNS/CMM susceptibility gene may be located on the short arm of chromosome 1, within 30 map units of the Rh locus [maximum logarithm of odds (lod) score = 2.00].

https://www.pnas.org/content/pnas/80/19/6071.full.pdf

Familial cutaneous malignant melanoma: autosomal dominant trait possibly linked to the Rh locus

Risk of melanoma and other cancers in melanoma-prone families.

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Precursor naevi in cutaneous malignant melanoma: a proposed nomenclature