Sapanisertib and Metformin in Treating Patients With Advanced or Metastatic Relapsed or Refractory Cancers

PRIMARY OBJECTIVES: I. To evaluate the safety and tolerability and to determine maximum tolerated dose (MTD) of the combination of sapanisertib (TAK-228) with metformin in patients with advanced cancers refractory to standard therapy. SECONDARY OBJECTIVES: I. To assess the clinical tumor response of this combination. II. To characterize the pharmacokinetic (PK) profile of metformin and TAK-228. OUTLINE: This is a dose escalation study. Patients receive metformin orally (PO) 1-3 times daily on days 1-42 and sapanisertib PO daily on days 15-42 of cycle 1. Patients then receive metformin PO daily and sapanisertib PO daily on days 1-28 of cycle 2 and beyond. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up within 30 days.