Study objectives: The primary objective is to determine the efficacy of BEZ235 on Objective Response Rate (best response on study) according to RECIST 1.1 criteria The secondary objectives are: * To determine the progression free survival rate at 32 weeks in the included population * To assess the duration of response among responders * To evaluate time to response * To evaluate the time to progression * To assess the overall survival * To evaluate safety and tolerability of BEZ235 The exploratory objectives are: * To identify molecular and genomic profiles of PEComas and their potential relationship to clinical outcome by analyzing PIK3CA, Ras, Raf, TSC, AKT and PTEN alteration in tumor samples (archival or fresh pre-treatment tumor biopsy) and PIK3CA in circulating DNA. * To determine biomarkers relevant to BEZ235 activity by analyzing the expression of phosphoproteins p-AKT, p-S6, p-4EBP1 at screening and during treatment as well as biomarkers for the proliferation (Ki-67) and apoptosis (PARP) (only if fresh tissue (optional) is available). Study population: The patient population consists of patients 18 years old or older with progressive unresectable/advanced or metastatic malignant PEComas previously treated for unresectable/advanced/metastatic disease with 1 to 2 prior lines of chemotherapy. Patients must have adequate hematologic, renal, cardiac and hepatic functions and not be previously treated with a mTOR inhibitor. Number of patients: 16 to 33 patients Overview of study design: This is a prospective, multicenter, open-label, single arm, two-stage phase II study to investigate the efficacy and tolerability of BEZ235 in patients with progressive metastatic or unresectable/advanced malignant PEComas. The patient should have received 1 or 2 prior lines of chemotherapy. BEZ235 will be administered until disease progression. Sixteen patients will be enrolled into Stage 1 and observed for at least 32 weeks at which time an interim analysis will be performed (plus eventually 4-5 weeks for confirmation of responses occurring on or closely before this cut-off date). If the number of patients with a response (CR or PR) is 2 or less, the trial will be stopped for futility. If 3 or more patients experience a response enrollment will continue up to 33 patients (Stage 2). An Independent Data Monitoring Committee (IDMC) will be constituted for reviewing the interim analysis.
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Proportion of Patients with best Objective Response Rate (ORR)
Timeframe: From treatment start to end of follow-up, assessed up to 30 months