[Case of higher efficacy by chemoradiotherapy for anal canal cancer from left cervix metastases to lymph nodes].

Case. 61-year-old woman. She noticed a left neck tumor and had a checkup by a nearby doctor. Biopsy showed a squamous cell carcinoma. She was searched from head to foot, but the primary carcinoma could not be identified. It was referred to our hospital as a primary unidentified carcinoma. In examination, the anal region had phyma in a rectal examination, and biopsy revealed it to be a squamous cell carcinoma. For anal canal cancer cStage IV, we performed chemotherapies of S-1+CDDP and local radiotherapy. There was a contraction of a lymph gland, and CT four months later lower endoscopy did not show the apparent phyma. We have continued chemotherapies in an outpatient department sequentially, but the image shows no increase of lymph gland nor increase of the primary tumor for 20 months with no decrease in QOL of the patient. Chemoradiotherapy including S-1 was effective for this case of anal canal cancer distant metastasis for which no apparent cause has been established thus far.