This study investigates the effectiveness of combining an investigational medication with carboplatin for treating small cell lung cancer. Small cell lung cancer is a type of cancer that usually starts in the breathing tubes and spreads quickly. The study aims to compare this combination to the usual treatment methods to see which is more effective.

Participants in the study will receive either the investigational medication with carboplatin or the standard treatment. The study will involve regular monitoring and assessments to understand the effects and safety of the treatments.

• Who can participate: Participants must not have had more than one prior chemotherapy treatment; previous immunotherapy is allowed. Male and female participants capable of having children must use effective birth control during and after the study.
• Study details: Participants will be divided into study arms to receive either the investigational medication with carboplatin or the standard treatment, with regular monitoring to assess effects and safety.