RecruitingPhase 1Drug trialGD2-SADA:177Lu-DOTA Complex in Patients With Solid Tumors Known to Express GD2Patients with Small Cell Lung Cancer, High Risk Neuroblastoma, Sarcoma and Malignant Melanoma will be treated with GD2-SADA:177Lu-DOTA complex(The IMP is a two-step radioimmunotherapy, delivered as two separate products GD2-SADA and 177Lu-DOTA) to assess safety and tolerability