[Creation, implementation and objectives of CARADERM, a national network for rare skin carcinomas - Adnexal neoplasm part].

Introduction: CARADERM is a French national network that includes patients with rare skin adnexal neoplasms. The present paper describes only the adnexal neoplasm part of this network. The primary objective of CARADERM is to improve medical care for malignant skin adnexal neoplasms. A multidisciplinary review group and a centralized pathological review group have been set up.

Patients And Methods: A dual network of clinicians and pathologists has been set up. Data are recorded in a secure database.

Results: The CARADERM network comprises of 38 clinical centres and 22 pathology centres. Between 2014 and 2017, 1598 patients with an adnexal neoplasm were included. Data of interest were documented in 80% of cases. Median patient age was 72 years. Major histological subtypes were sweat gland carcinomas (50%), hair follicle carcinomas (37.7%), and sebaceous gland carcinomas (9.8%). Surgery was the first-line treatment for 81% of patients, including 76.9% with standard surgical margin analysis, and 5.5% with exhaustive margin analysis. 920 patients (57.6%) underwent a national pathology review process.

Discussion: The CARADERM network aims at providing assistance in difficult situations concerning diagnosis and care in skin adnexal neoplasms. Analysis of the CARADERM data should allow the creation of a prognostic classification of these rare neoplasms together with recommendations. A national multidisciplinary consensus exists. Translational and therapeutic research is ongoing.

Conclusion: The CARADERM network is currently recruiting and more data should lead to improved knowledge of these tumours in the coming years.