The Study of Tusamitamab Ravtansine (IBI126) Combined With Sintilimab and Tusamitamab Ravtansine (IBI126) Combined With Sintilimab Plus Platinum-based Chemotherapy and Pemetrexed in Subjects With CEACAM5 Positive Expression Advanced/Metastatic Non-squamous Non-small-cell Lung Cancer (NSQ NSCLC)

Primary objective： ·To assess the antitumor activity of tusamitamab ravtansine in combination with sintilimab and tusamitamab ravtansine in combination with sintilimab, platinum-based chemotherapy and pemetrexed in the NSQ NSCLC population. Secondary objectives： To assess the safety and tolerability of tusamitamab ravtansine in combination with sintilimab and tusamitamab ravtansine in combination with sintilimab, platinum-based chemotherapy and pemetrexed in the NSQ NSCLC population. To assess the pharmacokinetic (PK) characteristic of tusamitamab ravtansine in combination with sintilimab and tusamitamab ravtansine in combination with sintilimab, platinum-based chemotherapy and pemetrexed in the NSQ NSCLC population.