Biomarker Analysis of HIPEC Combined With PD1/PDL1 Inhibitor for Gastric Cancer With Peritoneal Metastasis

All patients will be treated with standard of conversion treatment with HIPEC combined PD1/PDL1 inhibitor. After obtaining written informed consent, participants will have serial blood, tumor tissue collection. The blood collection (10 ml) should coincide with routine clinical blood draw to minimize participant discomfort if possible. No additional procedures will be performed other than phlebotomy. Participants will remain on the study for as long as they are being followed or treated at Affiliated Cancer Hospital \& Institute of Guangzhou Medical University. Participants can withdraw from the study at any time.