Participants With Dose Limiting Toxicities (DLT)

Part 1, Cohort 2: AMG 820 1100 mg + Pem 200 mg

Part 1 Cohort 2 includes participants with advanced solid tumors who were treated with 1100 mg AMG 820 plus 200 mg pembrolizumab (Pem) every three weeks (Q3W) to determine safety. Participants could be treated up to 24 months if treatment was tolerable and clinical benefit was observed.

Part 1, Cohort 1: AMG 820 1400 mg + Pem 200 mg

Part 1 Cohort 1 includes participants with advanced solid tumors who were treated with 1400 mg AMG 820 plus 200 mg pembrolizumab (Pem) every three weeks (Q3W) to determine safety. Participants could be treated up to 24 months if treatment was tolerable and clinical benefit was observed. If \>= 3 participants had dose limiting toxicities (DLTs), a second cohort was created with a lower AMG 820 dose + Pem 200 mg.

Part 2, Group 1: CRC MMR-proficient

Group 1 is comprised of participants with colorectal cancer (CRC) who are proficient in mismatch repair genes (MMR). AMG 820 was administered at the recommended dose of 1100 mg intravenously in combination with pembrolizumab 200 mg every 3 weeks (± 3 days). Each group in Part 2 was evaluated separately using a Simon 2-stage design. Treatment continued until confirmed disease progression per modified irRECIST, or intolerance of study treatment, or clinically significant deterioration of health status requiring discontinuation, whichever occurred first, or the subject withdrew consent.

Part 2, Group 2: Pancreatic Cancer

Group 2 is comprised of participants with advanced pancreatic cancer who are naïve to anti programmed-death 1 (PD-1), anti PD-ligand 1 (PD-L1), colony stimulating factor 1 (CSF-1) and colony stimulating factor 1 receptor (CSF-1R) therapies. AMG 820 was administered at the recommended dose of 1100 mg intravenously in combination with pembrolizumab 200 mg every 3 weeks (± 3 days). Each group in Part 2 was evaluated separately using a Simon 2-stage design. Treatment continued until confirmed disease progression per modified irRECIST, or intolerance of study treatment, or clinically significant deterioration of health status requiring discontinuation, whichever occurred first, or the subject withdrew consent.

Part 2, Group 3: NSCLC PD-L1 Low, Naïve

Group 3 is comprised of participants with non-small cell lung cancer (NSCLC) who have low (\< 50%) tumor PD-L1- expression and are naïve to anti-PD-1/PD-L1/CSF-1/CSF-1R agents. AMG 820 was administered at the recommended dose of 1100 mg intravenously in combination with pembrolizumab 200 mg every 3 weeks (± 3 days). Each group in Part 2 was evaluated separately using a Simon 2-stage design. Treatment continued until confirmed disease progression per modified irRECIST, or intolerance of study treatment, or clinically significant deterioration of health status requiring discontinuation, whichever occurred first, or the subject withdrew consent.

Part 2, Group 4a: Refractory / Relapsing NSCLC PD-L1 Low

Group 4a is comprised of participants who did not respond to or who relapsed during monotherapy with anti-PD-1/PD-L1 agents and are anti-CSF-1/CSF-1R naïve. These participants have low PD-L1 tumor expression (\<50%). AMG 820 was administered at the recommended dose of 1100 mg intravenously in combination with pembrolizumab 200 mg every 3 weeks (± 3 days). Each group in Part 2 was evaluated separately using a Simon 2-stage design. Treatment continued until confirmed disease progression per modified irRECIST, or intolerance of study treatment, or clinically significant deterioration of health status requiring discontinuation, whichever occurred first, or the subject withdrew consent.

Part 2, Group 4b: Refractory/Relapsing NSCLC PD-L1 High

Group 4b is comprised of participants who did not respond to or who relapsed during monotherapy with anti-PD-1/PD-L1 agents and are anti-CSF-1/CSF-1R naïve. These participants have high PD-L1 tumor expression (\>=50%). AMG 820 was administered at the recommended dose of 1100 mg intravenously in combination with pembrolizumab 200 mg every 3 weeks (± 3 days). Each group in Part 2 was evaluated separately using a Simon 2-stage design. Treatment continued until confirmed disease progression per modified irRECIST, or intolerance of study treatment, or clinically significant deterioration of health status requiring discontinuation, whichever occurred first, or the subject withdrew consent.

Analysis denominator · Participants