Calculation of the peritoneal cancer index (adapted from Jacquet et al.
METASTASES
After the confirmation of metastases on the frozen section and a PCI≤12, an intraperitoneal catheter will be inserted. If the PCI is higher than 12, the catheter will not be placed, and the patient will be excluded from the study. In this case, cytoreductive gastrectomy will not be performed, and the patient will be referred for palliative systemic chemotherapy.A fully implantable long-term catheter (long-term catheter type) will be used (After the implantation of the peritoneal catheter, IPC will start after 7 days of implantation up to 90 days. If, for some reason, the treatment is not started within 3 months, the catheter will be removed and the patient will be discontinued from the study.