“…In Japan, clinical studies of chemotherapeutic regimens including oral 5-FU derivatives date back many years, and as a consequence, unique regimens of postoperative chemotherapy have been developed in Japan. In particular, long-term, daily oral treatment with tegafur plus uracil (UFT) as postoperative adjuvant chemotherapy was recently shown to prolong survival in patients with gastric [4], colorectal [5], and lung [6] cancer. To assess the usefulness of postoperative chemotherapy with UFT in breast cancer, the Adjuvant Chemoendocrine Therapy for Breast Cancer (ACETBC) study, the first large clinical trial of its type to be conducted in Japan, was performed [7,8].…”