Post-Authorization Long-Term Safety Study of LUTATHERA

Inclusion Criteria: * adult patients (fulfilling the definition of "age of majority" per local regulations), * with unresectable or metastatic, well-differentiated, somatostatin receptor positive GEP-NETs * and who were treated with Lutathera (regardless of the quantity and number of doses administered and whatever the reasons for ending). Exclusion Criteria: * Hypersensitivity to Lutathera (active substance or any of the excipients), * presence of established or suspected pregnancy or pregnancy not excluded, * presence of kidney failure with creatinine clearance \< 30 mL/min.