Node-Sparing Short-Course Radiotherapy Plus First-Line Therapy and PD-1 Inhibitor in Unresectable/Metastastic pMMR/MSS Gastric Cancer (MODIFI-GC)

Patients will receive node-sparing modified short-course radiotherapy, followed by standard first-line chemotherapy combined with a PD-1 inhibitor starting 2-5 days after radiotherapy. Treatment will continue until disease progression or the occurrence of unacceptable toxicity.

Patients will receive standard first-line chemotherapy combined with a PD-1 inhibitor. Treatment will continue until disease progression or the occurrence of unacceptable toxicity.