Merkel cell carcinoma, advanced basal cell carcinoma requiring systemic treatment, and cutaneous adnexal carcinomas are 3 types of rare skin cancers for which much remains unknown in terms of natural behavior, prognosis, treatment and outcomes.
CARADERM is a French prospective national cohort enrolling patients with either one of these 3 tumor types, whose objectives are :
* to provide epidemiological, clinical and socio-economic characteristics of patients * to identify new clinical or epidemiological prognostic factors for these rare cancers * to evaluate the impact of various treatments on outcomes
Patients with histologically confirmed Merkel cell carcinoma, advanced basal cell carcinoma requiring systemic treatment, or cutaneous adnexal carcinoma
Subjects without Merkel cell carcinoma, advanced basal cell carcinoma requiring systemic treatment, or cutaneous adnexal carcinoma
Patients refusal