We retrospectively evaluated the results of the concurrent combination therapy of selective continuous intraarterial chemotherapy and radiotherapy in 39 patients with locally advanced cancer of the tongue and tongue base between September 1992 and January 2000. Thirty patients were fresh cases (stage II, 10 patients; stage III, 15; stage IV, five) and nine were recurrent cases. The primary lesion was present in the mobile tongue in 33 patients and the tongue base in six. External irradiation (median dose, 48.6 Gy) was performed in all patients, and interstitial brachytherapy using an Au grain or Cs needle (median dose, 50 Gy) in 21. In intraarterial chemotherapy, a catheter was selectively inserted into the lingual artery via the superficial temporal artery, and carboplatin (CBDCA) was continuously infused (median dose, 460 mg/m(2)) concurrently with radiotherapy. In 13 patients with cervical lymph node metastasis, two courses of systemic chemotherapy with 5-FU (700 mg/m(2) x 5 days) and cisplatin (40-50 mg/m(2)x2 days) or its analog was also performed. In 37 (94.9%) of the 39 patients in whom this combination therapy was completed, the response rate was 94.6%. The 3-year local control rate, progression-free survival rate, and overall survival rate by Kaplan-Meier's method were 79.2, 53.2, and 58.9%, respectively. This combination therapy was effective for locally advanced cancer of the tongue and tongue base without causing severe adverse side effects, and a local control rate comparable to that by surgery can be expected.