NT-I7 (Efineptakin Alfa) in Combination With Pembrolizumab in Participants With Advanced Solid Tumors

This is a multicenter, open-label Phase 1b/2a study of NT-I7 in combination with pembrolizumab. The study consists of a dose escalation phase (Phase 1b) followed by a dose expansion phase (Phase 2a) and a Biomarker Cohort. The Phase 1b is designed to assess the safety and tolerability, including determination of the Maximum Tolerated Dose (MTD) and/or the Recommended Phase 2 Dose (RP2D) of NT-I7. The main purpose of Phase 2a of this study is to assess the preliminary antitumor activity of NT-I7 in combination with pembrolizumab in participants with relapsed/refractory * checkpoint inhibitor (CPI)-treated Triple Negative Breast Cancer (TNBC), Non-small Cell Lung Cancer (NSCLC), and Small Cell Lung Cancer (SCLC) * checkpoint inhibitor (CPI)-naïve Microsatellite Stable Colorectal Cancer (MSS-CRC), and Pancreatic Cancer (PC) The Biomarker Cohort is designed to assess the correlation between tumor infiltrating lymphocytes (TILs) and clinical benefits of NT-I7 in combination with pembrolizumab in participants with CPI naïve R/R Ovarian Cancer (OC).