The expected duration of the study intervention for participants may vary based on progression date; median expected duration of study per participant is estimated 10 months (up to 1 month for screening, a median of 6 months for treatment, and a median of 3 months for end-of-treatment assessments and safety follow-up visit).
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.