Study of Efficacy and Safety of PDR001 in Patients With Advanced or Metastatic, Well-differentiated, Non-functional Neuroendocrine Tumors of Pancreatic, Gastrointestinal (GI), or Thoracic Origin or Poorly-differentiated Gastroenteropancreatic Neuroendocrine Carcinoma (GEP-NEC)

ORR is defined as the proportion of patients with best overall response (BOR) of complete response (CR) or partial response (PR), according to BIRC radiological assessment by RECIST 1.1.

CR: disappearance of all non-nodal target lesions. In addition, any pathological lymph nodes assigned as target lesions must have a reduction in short axis to < 10 mm.

PR: at least a 30% decrease in the sum of diameter of all target lesions, taking as reference the baseline sum of diameters.

DOR is defined as the time between the date of first documented response (CR or PR) and the date of first documented disease progression by RECIST 1.1 and as per BIRC or death due to underlying cancer. For DOR analysis, participants continuing without progression or death due to underlying cancer were censored at the date of their last adequate tumor assessment. An adequate tumour assessment is a tumour assessment with an overall response other than unknown.

CR: disappearance of all non-nodal target lesions. In addition, any pathological lymph nodes assigned as target lesions must have a reduction in short axis to < 10 mm.

PR: at least a 30% decrease in the sum of diameter of all target lesions, taking as reference the baseline sum of diameters.

Disease control rate is defined as the proportion of patients with best overall response of CR, PR or stable disease (SD) according to RECIST 1.1 criteria and as per BIRC.

CR: disappearance of all non-nodal target lesions. In addition, any pathological lymph nodes assigned as target lesions must have a reduction in short axis to < 10 mm.

PR: at least a 30% decrease in the sum of diameter of all target lesions, taking as reference the baseline sum of diameters.

SD: neither sufficient shrinkage to qualify for PR or CR nor an increase in lesions which would qualify for progressive disease.

TTR is defined as the time from the date of start of treatment to the first documented response of either CR or PR, which must be subsequently confirmed. TTR was evaluated according to RECIST 1.1 and as per BIRC.

CR: disappearance of all non-nodal target lesions. In addition, any pathological lymph nodes assigned as target lesions must have a reduction in short axis to < 10 mm.

PR: at least a 30% decrease in the sum of diameter of all target lesions, taking as reference the baseline sum of diameters.

PFS is defined as the time from the date of first dose to the date of the first documented radiological progression or death due to any cause. PFS was evaluated according to RECIST 1.1 and as per BIRC. For participants who had not progressed or died at the analysis cut-off date, PFS was censored at the date of the last adequate tumor evaluation date. An adequate tumour assessment is a tumour assessment with an overall response other than unknown.

irORR is the proportion of patients with a best overall response of immune related Complete Response (irCR) or immune related partial response (irPR), according to BIRC assessment by irRECIST.

irCR: Complete disappearance of all measurable and non-measurable lesions. In addition, any pathological lymph nodes must have a reduction in short axis to < 10 mm.

irPR: At least 30% decrease in the total measurable tumor burden (TMTB) compared to baseline and not qualifying for irCR or immune related progressive disease (irPD).

irDOR is defined as the time from first documentation of irCR or irPR until the time of first documentation of progression per irRECIST based on BIRC assessment. Participants continuing without progression or death due to underlying cancer were censored at the date of their last adequate tumor assessment. An adequate tumour assessment is a tumour assessment with an overall response other than unknown for irRECIST.

irCR: Complete disappearance of all measurable and non-measurable lesions. In addition, any pathological lymph nodes must have a reduction in short axis to < 10 mm.

irPR: At least 30% decrease in the TMTB compared to baseline and not qualifying for irPD or irCR

irTTR is defined as the time between date of start of treatment until first documented response (confirmed irCR or irPR) by irRECIST and as per BIRC.

irCR: Complete disappearance of all measurable and non-measurable lesions. In addition, any pathological lymph nodes must have a reduction in short axis to < 10 mm.

irPR: At least 30% decrease in the TMTB compared to baseline and not qualifying for irPD or irCR.

irDCR is defined as the proportion of patients with a best overall response of irCR or irPR or immune related stable disease (irSD) according to irRECIST and as per BIRC.

irCR: Complete disappearance of all measurable and non-measurable lesions. In addition, any pathological lymph nodes must have a reduction in short axis to < 10 mm.

irPR: At least 30% decrease in the TMTB compared to baseline and not qualifying for irPD or irCR.

irSD: Neither a sufficient shrinkage to qualify for irPR or irCR, nor an increase in lesions, or a clear and unequivocal progression of existing nontarget or new non-measurable lesions that would qualify for irPD.

irPFS is defined as the time from date of start of treatment to the date of event defined as the first documented assessment of immune related progression that is confirmed or death due to any cause. If a patient has not had an event, immune related progression-free survival was censored at the date of last adequate tumor assessment. An adequate tumor assessment is a tumor assessment with overall response other than unknown for irRECIST.

OS is defined as the time from the start of treatment date to the date of death, due to any cause. If a patient was not known to have died, then OS was censored at the latest date the patient was known to be alive.

Blood samples were collected for assessment of CgA level. Change from Baseline at a particular visit was calculated as the CgA level at that visit minus Baseline.

Blood samples were collected for assessment of NSE level. Change from Baseline at a particular visit was calculated as the NSE level at that visit minus Baseline.

Blood samples will be taken to evaluate the pharmacokinetics by assessing plasma concentration of PDR001 at selected time points

The EORTC QLQ-C30 is a patient completed 30 item questionnaire that is composed of both multi-item scales and single-item measures. These include five functional scales, three symptom scales, six single items and a global health status/QoL scale. Global health status/QoL response options are 1 to 4. Scores were averaged and transformed to 0 to 100. Higher scores indicate better functioning.

Change from Baseline was calculated by subtracting Baseline value from the selected visit value. A positive change from Baseline indicates improvement.

The EQ-5D-5L descriptive system provides a profile of the participant's health state in 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each of these dimensions, the participant self-assigned a score: from 1 (no problems) to 5 (extreme problems). The 5 digit health states obtained for each dimension was converted into a single mean index value based on the EQ-5D crosswalk value set for the UK using the time trade-off method. This index ranges from -0.594 (worst health) to 1.0 (best health). Change from Baseline was calculated by subtracting Baseline value from the selected visit value. A positive change from baseline indicates improvement.

ADA prevalence at baseline was calculated as the proportion of participants who had an ADA positive result at baseline

ADA incidence on treatment was calculated as the proportion of participants who were treatment-induced ADA positive (post-baseline ADA positive with ADA-negative sample at baseline) and treatment-boosted ADA positive (post-baseline ADA positive with titer that is at least the fold titer change greater than the ADA-positive baseline titer)