A 74-year-old man presented to our hospital because of anorexia. Upper gastrointestinal endoscopy revealed type 3 gastric cancer. Further examination disclosed metastasis to the perigastric lymph nodes and to the liver, and a diagnosis of non- resectable advanced gastric cancer(cT4N2H1P0M0)in cStage Ⅳ was made. A total of 4 courses of S-1 plus oxaliplatin therapy(80 mg/body/day and 100 mg/m2/cycle, respectively, for 2 weeks followed by a 1-week rest)were administered as the primary chemotherapy. Then, another metastasis to the abdominal lymph nodes and increased liver metastasis were found; thus, the patient's condition was rated as progressive disease(PD). Secondary chemotherapy comprising 10 courses of weekly nab-paclitaxel(nab-PTX)plus ramucirumab(RAM)therapy(100 mg/m2 on days 1, 8, and 15 and 8 mg/kg on days 1 and 15, respectively, every 4 weeks)were administered. Although temporary reductions in the perigastric lymph node metastasis and liver metastasis as compared with the baseline were observed, another metastasis to the abdominal lymph nodes occurred subsequently, resulting in PD. As tertiary chemotherapy, nivolumab therapy(240 mg/body, every 3 weeks) was repeated up to a total of 30 courses over 13 months. This therapy was markedly effective, achieving a near complete response. The patient is currently being followed up as an outpatient.
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