Enfortumab vedotin (EV) is an antibody-drug conjugate (ADC) targeting nectin-4. In patients with metastatic urothelial carcinoma, EV in combination with pembrolizumab (anti-PD1) provides significantly better progression-free and global survival than platinum-based chemotherapies, with the benefit observed from the first line of treatment. However, EV is associated with a high frequency of cutaneous adverse events (AE), which may be due to physiological Nectin-4 expression in keratinocytes. These cutaneous toxicities include bullous/blistering toxicities and toxic epidermal necrolysis-like AE. While the association between cutaneous AE and survival has been demonstrated with anti-PD1, its association with survival in patient treated with ADC remains unknown. The objective of this retrospective dual-centric study is to determine whether there is an association between drug-related cutaneous AE and progression free survival in patients treated with EV.

Inclusion Criteria:

- All adult patients who have been treated with enfortumab vedotin at Hôpital Lyon Sud or Centre Léon Bérard and for whom follow-up data of at least 6 months are available are eligible for inclusion. To be included, patients must be willing and able to provide non-opposition consent for participation in this study and for the use of their medical data in this context.

Exclusion Criteria:

-Any medical, social, or psychiatric condition that might impair the patient's capacity to provide informed consent to participate in the study and to the use of their medical data is considered an exclusion criterion

Adult patients who have received enfortumab vedotin treatment at the Centre Léon Bérard or Hôpital Lyon Sud, and who do not object to the collection of their data.