Durvalumab (MEDI4736) Plus Tremelimumab for Advanced Neuroendocrine Neoplasms of Gastroenteropancreatic or Lung Origin

Inclusion Criteria

• Written informed consent obtained from the subject prior to performing any protocol-related procedures.
• Age >18 years at time of study entry.
• Subjects must have histologically confirmed diagnosis of one of the following advanced/metastatic neuroendocrine tumor types:
• Cohort 1: Well-moderately differentiated neuroendocrine tumors of the lung ( mitotic count ≤10 mitoses x 10 HPF), also known as typical and atypical lung carcinoids, that have progressed to prior somatostatin analog therapy and/or one prior targeted therapy or chemotherapy (only one prior systemic therapy, with the exception of patients that have been treated with somatostatin analogues and other systemic treatment, when two prior treatments are allowed).
• Cohort 2: Well-moderately differentiated G1/G2 (WHO grade 1 and 2) gastrointestinal neuroendocrine tumors after progression to somatostatin analogs and one targeted therapy (prior targeted therapy could be everolimus or a multikinase inhibitor). Prior therapies with interferon alpha-2b or radionucleotide therapy are allowed.
• Cohort 3: Well-moderately differentiated neuroendocrine tumors G1/G2 (WHO grade 1 and 2) from pancreatic origin after progression to standard therapies (chemotherapy, somatostatin analogs and target therapy); patients must be treated with at least two prior systemic treatment lines and a maximum of four previous treatment lines.
• Cohort 4: Neuroendocrine neoplasms (WHO grade 3) of gastroenteropancreatic origin of unknown primary site (excluding lung primary tumors) after progression to first-line chemotherapy with a platinum based regimen.
• For patients included in cohorts 1, 2 and 3: WHO Classification G1/G2 (mitotic count ≤10 mitoses x 10 HPF) lung typical and atypical carcinoids for cohort 1, G1/G2 (Ki67≤20% and mitotic count ≤20 mitoses x 10 HPF) gastrointestinal for cohort 2 (including stomach, small intestine and colorectal origins), G1/G2 (Ki67≤20% and mitotic count ≤20 mitoses x 10 HPF) pancreatic for cohort 3.
• For patients included in cohort 4: WHO classification G3 (Ki67>20% or mitotic count >20 mitoses x 10 HPF) gastroenteropancreatic neuroendocrine carcinomas (NEC) or liver metastases of G3 NEC of unknown primary site.
• Subjects must have evidence of measurable disease meeting the following criteria:
• In case of more than one target lesion, it should be identified at least 1 lesion of ≥ 1.0 cm in the longest diameter for a non lymph node, or ≥ 1.5 cm in the short-axis diameter for a lymph node, which is serially measurable according to RECIST 1.1 using computerized tomography/magnetic resonance imaging (CT/MRI). If there is only one target lesion and it is a non-lymph node, it should have a longest diameter of ≥ 1.5 cm.
• Lesions that have had external beam radiotherapy (EBRT) or loco-regional therapies such as radiofrequency (RF) ablation or liver embolization must show evidence of progressive disease based on RECIST 1.1 to be deemed a target lesion.
• Subjects must show evidence of disease progression by radiologic image techniques within 12 months (an additional month will be allowed to accommodate actual dates of performance of scans, i.e., within ≤ 13 months) prior to signing informed consent, according to RECIST 1.1 .
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
• Life expectancy of at least 12 weeks.
• Adequate normal organ and marrow function as defined below: Haemoglobin ≥ 9.0 g/dL; Absolute neutrophil count (ANC) ≥ 1.5 x 109/L (> 1500 per mm3); Platelet count ≥ 100 x 109/L (>100,000 per mm3).
• Serum bilirubin ≤ 1.5 x institutional upper limit of normal (ULN). This will not apply to subjects with confirmed Gilbert's syndrome (persistent or recurrent hyperbilirubinemia that is predominantly unconjugated in the absence of hemolysis or hepatic pathology), who will be allowed only in consultation with their physician.
• AST (SGOT)/ALT (SGPT) ≤ 2.5 x institutional upper limit of normal u