Study in Children and Adolescents of 177Lu-DOTATATE (Lutathera®) Combined with the PARP Inhibitor Olaparib for the Treatment of Recurrent or Relapsed Solid Tumours Expressing Somatostatin Receptor (SSTR) (LuPARPed).

7Lu-DOTATATE will be administered intravenously, on day 1, every 8 weeks, at a fixed dose of 200 mCi (7.4 GBq) for children \>= 12 years old infused intravenously over a period of 30 minutes. For children younger than 12 years old, the dose that will be administered is 200 MBq per kilogram of body weight (maximum 7.4 GBq) infused intravenously over a period of 30 minutes. Concomitant to 177Lu-DOTATATE, patients will receive IV fluids and an IV infusion of amino acid solution for renal protection23. Patients will receive four infusions every 8 weeks (maximum cumulative radioactivity, 29.6 GBq \[800 mCi\]). Olaparib will be administered PO, BID, days 2-29, every 8 weeks at a fixed dose of 187.5mg/m2 twice daily (BID).