Efficacy and Safety Study in Pancreatic or Midgut Neuroendocrine Tumours Having Progressed Radiologically While Previously Treated With Lanreotide Autogel® 120 mg

Inclusion Criteria: * Histopathologically confirmed, grade 1 or 2, metastatic or locally advanced, unresectable pNET (pNET cohort) or midgut NET (midgut cohort) with or without hormone related syndromes, with a proliferation index (Ki67) ≤20%. * Positive somatostatin receptors type 2 * Progression as assessed by an independent central reviewer according to RECIST v1.0 while receiving first line treatment with lanreotide Autogel® at a standard dose of 120 mg every 28 days for at least 24 weeks Exclusion Criteria: * Grade 3 or rapidly progressive (within 12 weeks) NET * Any NET other than pancreatic and midgut * Previous treatment with any antitumour agent for NET other than lanreotide Autogel® 120 mg every 28 days. Exception made of prior treatment with Octreotide at standard dose stopped for other reason than disease progression. * Symptomatic gallbladder lithiasis at screening echography or history of cholelithiasis with no cholecystectomy since then.