Retrospective and Prospective Observational Study in Patients With Advanced Basal Cell Carcinoma

Male and female patients aged ≥ 18 years

Patients diagnosed with advanced basal cell carcinoma of the skin, i.e. tumours included in at least one of the following categories: locally advanced carcinoma (not radically treatable by surgery and/or radiotherapy), carcinoma with lymph node and/or distant metastatic localisation

patients who have had at least one access (first visit or follow-up visit) at the dermatology or oncology outpatient clinic of the centres involved

Patients diagnosed with advanced BCC who have accessed the centre from 1 January 2016 until the date of activation of the centre will be included in the retrospective cohort;