A 33-year-old patient with a pregnancy of 25 weeks was hospitalized in the oncological dispensary with complaints of aching pains in the epigastrium, which increased after eating, nausea, vomiting with eaten food, hemoptysis, heartburn. On the basis of complaints, anamnesis, objective data and performed instrumental, histological examinations, a clinical diagnosis was made: “Pregnancy of 28 weeks. Chronic decompensated placental insufficiency with a disturbance of utero-placental and fetal-placental blood flow of the second degree. Intrauterine growth retardation of the second degree. Subtotal gastric cancer T4N3M0 stage IIIC. Clinical group 2, pathohistological examination (PHE) — ulcerated colloid carcinoma, immunohistochemical examination — Her2 (+++), complicated by Forest bleeding (F1b)”. At the term of 28 weeks of gestation period, an operation was performed in the oncological dispensary: caesarean section, amputation of the uterus with appendages, ligation of the gastric vessels, formation of a nutritious enterostomy. Final diagnosis: Pregnancy of 28 weeks. Chronic decompensated placental insufficiency with a disturbance of utero-placental and fetal-placental blood flow of the second degree. Intrauterine growth retardation of the second degree. Total stomach cancer (PHE — colloid carcinoma) T4bN3M1 (per) PCI 28, stage IV. Clinical group 2. Complication: gastric bleeding that took place. Decompensated stenosis of the stomach. Anemia of moderate severity. Subsequently, the patient received five courses of chemotherapy. The patient died 20 weeks after the operation due to the progression of the disease: development of metastases to the lungs and the liver, cancerous cachexia. Her daughter is healthy, developing according to her age.