To evaluate the anti-tumor activity of NKTR-214 in combination with nivolumab by assessing the ORR by Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1) per blinded independent central review (BICR) in patients whose tumors have low programmed cell death ligand 1 (PD-L1) expression. ORR was defined as the percentage of patients with confirmed objective response of Complete Response (CR) or Partial Response (PR) on or before the first progressive disease and any subsequent anticancer therapy.

CR is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) had to have reduction in short axis to <10 mm. PR is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.

The primary endpoint of ORR per RECIST 1.1 by BICR was evaluated in the Treated PD-L1 Low Population (123 patients).

The Treated Population included 188 patients who were enrolled and received at least one full (or partial dose) of NKTR-214 or nivolumab.

PD-L1 Low: Patients in the Treated Population whose tumors had low PD-L1 expression (defined as Combined Positive Score [CPS] < 10). From the 188 patients, 123 had tumors with low PD-L1 expression.

To evaluate the anti-tumor activity of NKTR-214 in combination with nivolumab by assessing the ORR by Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1) per blinded independent central review (BICR) in all treated patients. ORR was defined as the percentage of patients with confirmed objective response of Complete Response (CR) or Partial Response (PR) on or before the first progressive disease and any subsequent anticancer therapy.

CR is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) had to have reduction in short axis to <10 mm. PR is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.

The secondary endpoint of ORR per RECIST 1.1 by BICR was evaluated in the Treated Population (188 patients).

To evaluate the effect of NKTR 214 in combination with nivolumab by assessing DOR by Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1) per blinded independent central review (BICR) in all treated patients and patients whose tumors have low PD-L1 expression.

DOR is defined for patients who have a confirmed Complete Response (CR) or Partial Response (PR) as the date from first documented CR or PR per RECIST 1.1 to the date of documentation of disease progression as assessed by BICR or death due to any cause, whichever is earlier. Patients who do not have disease progression or die will be censored on the date of their last evaluable tumor assessment.

All Treated Population who had a confirmed Complete Response (CR) or Partial Response (PR) per RECIST 1.1.

Treated PD-L1 Low: Patients in the Treated Population whose tumors had low PD-L1 expression (defined as Combined Positive Score [CPS] < 10).

To evaluate the anti-tumor activity of NKTR-214 in combination with nivolumab by assessing the ORR by Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1) by Investigator Assessment in All Treated Patients and Patients Whose Tumors Have Low Programmed Cell Death Ligand (PD-L1) Expression.

ORR was defined as the percentage of patients with confirmed objective response of Complete Response (CR) or Partial Response (PR) on or before the first progressive disease and any subsequent anticancer therapy.

The All Treated Population included 188 patients who were enrolled and received at least one full (or partial dose) of NKTR-214 or nivolumab.

Treated PD-L1 Low: Patients in the Treated Population whose tumors had low PD-L1 expression (defined as Combined Positive Score [CPS] < 10). From the 188 patients, 123 had tumors with low PD-L1 expression.

To evaluate the effect of NKTR 214 in combination with nivolumab by assessing DOR by Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1) by Investigator Assessment in all treated patients and patients whose tumors have low PD-L1 expression.

DOR is defined for patients who have a confirmed Complete Response (CR) or Partial Response (PR) as the date from first documented CR or PR per RECIST 1.1 to the date of documentation of disease progression as assessed by BICR or death due to any cause, whichever is earlier. Patients who do not have disease progression or die will be censored on the date of their last evaluable tumor assessment.

All Treated Population who had a confirmed Complete Response (CR) or Partial Response (PR) per RECIST 1.1.

Treated PD-L1 Low: Patients in the Treated Population whose tumors had low PD-L1 expression (defined as Combined Positive Score [CPS] < 10).