Clinical and histological characteristics, and management of melanoma in French Guiana, 2007-2018

There are few studies available on melanoma in Afro-Caribbean and Amerindian populations of South America. French Guiana deserves a study due to its specific health system and diversity of phototypes. The objectives of this study were to evaluate the incidence, histological and clinical characteristics of melanoma in French Guiana. A retrospective study was conducted from October 2007 to January 2018 on all primary melanomas observed at the Cayenne Hospital Centre. Thirty-nine patients were included. The incidence rate (1.61/10⁶ inhabitants/year) was low compared with mainland France. Median age was 58, and gender ratio 1 : 16. Clear phototype (I/II) patients were the most frequent (38.5%), but a significant amount of melanoma also occurred in darker skin. Median Breslow was higher in dark phototypes than in fair-skinned patients. Superficial spreading melanoma (SSM) was the most common histological type (33.3%), particularly in patients with clear phototype (61.5%). Acral lentiginous melanoma was found only in darker-skinned patients (29.1%). The trunk was involved in 66.6% in the clearest group whereas foot was the most common location in the darkest group (60% in V/VI phototypes). Surgery was the most frequently used treatment (79.5%). At the end of the study period, 53.8% had been lost to follow-up. In conclusion, the incidence of melanoma in French Guiana is lower than in mainland France but remains a public health concern, as dark-skinned populations often present with advanced diseases. Awareness and prevention in these communities must be improved.