Easton D F, Cox G M, Macdonald A M, Ponder B A
Section of Epidemiology, Institute of Cancer Research, Sutton, Surrey.
Br J Cancer. 1991 Dec;64(6):1164-7. doi: 10.1038/bjc.1991.483.
The risk of malignant melanoma to an individual is strongly related to their total number of benign melanocytic naevi. To investigate the possibility that numbers of naevi may have an inherited basis, naevi were examined in 23 monozygotic and 22 dizygotic twin pairs. A strong correlation in total numbers of naevi 3 mm or more in diameter was observed between MZ twins (intraclass correlation 0.83), but there was no significant correlation between DZ twins (correlation -0.24). There was no increased concordance in presence of naevi 5 mm or more over that expected by chance, for MZ or DZ twins. The results suggest a strong inherited basis for total naevus count and hence melanoma risk, perhaps involving a number of interacting genes.
个体患恶性黑色素瘤的风险与其良性黑素细胞痣的总数密切相关。为了研究痣的数量可能存在遗传基础的可能性,对23对同卵双胞胎和22对异卵双胞胎的痣进行了检查。在直径3毫米或更大的痣的总数方面,同卵双胞胎之间观察到很强的相关性(组内相关系数为0.83),而异卵双胞胎之间没有显著相关性(相关系数为-0.24)。对于同卵或异卵双胞胎,直径5毫米或更大的痣的出现率并没有高于偶然预期的一致性增加。结果表明痣的总数以及因此患黑色素瘤的风险有很强的遗传基础,可能涉及多个相互作用的基因。