[A case of transverse colon cancer with left supraclavicular lymph node metastasis and paraaortic lymph node metastases responding to TS-1].

: A 61-year-old man was seen at our hospital because he noticed a mass on the left side of his neck. After examinations, he was diagnosed as transverse colon cancer with the left supraclavicular lymph node metastasis and paraaortic lymph node metastases. Rt. hemicolectomy was performed for the transverse colon cancer. At 15 days after operation, TS-1 chemotherapy was started (each treatment course consisted of daily oral administration of 100 mg TS-1 for 4 weeks followed by 2 drug-free weeks). After the first course, the left supraclavicular lymph node had shrunk markedly in physical findings. After the second course, both the left supraclavicular lymph node metastasis and paraaortic lymph node metastases had disappeared in CT findings. A complete remission was observed after the second course, and was maintained thereafter. The serum level of CA 19-9 decreased from 62 U/ml under the normal value after the second course, and was kept under this normal value. Leukopenia and eruption (grade 2) were the only observed adverse effects. This patient continues to undergo outpatient treatment with good QOL.