Study of Anti-CEACAM5 ADC M9140 in Participants With Advanced Solid Tumors (PROCEADE PanTumor)

The study follows a master protocol concept with several separate substudies in specific indications. * Substudy GC: The study duration per participant is on an average approximately 10 months. This includes a 28-day Screening period, infusion (approximately 1 hour) on Day 1 of every cycle, and Safety Follow-up Visit 30 (± 3) days after the last dose of M9140. * Substudy NSCLC: Study duration per participant is approximately 12 months. This includes a 28-day Screening period, infusion (approximately 1 hour) on Day 1 of every cycle, and Safety Follow-up Visit 30 (± 3) days after the last dose of M9140. * Substudy PDAC: Study duration per participant is on an average approximately 8 months. This includes a 28-day Screening period, infusion (approximately 1 hour) on Day 1 of every cycle, and Safety Follow-up Visit 30 (±3) days after the last dose of M9140.