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Supplementation of oral clodronate to postoperative adjuvant treatment for breast cancer (BC) considerably improves overall and relapse-free survival rates. The paper gives the results of a long-term follow-up of patients during a prospective randomized controlled study.Subjects and methods. The study included patients with primary BC receiving clodronate in a dose of 1600 mg/day in combination with the conventional adjuvant therapy for BC.Results. An analysis of 290 of 302 patients indicated a significant increase in overall survival in the clodronate group at a median fol- low-up of 103±12 months; during 8.5 years after primary surgical treatment, 20.4% and 40.7% of patients died in the clodronate and control groups, respectively (p = 0.04). The clodronate group did not show a considerable reduction in the rate of metastatic lesions in the bone and visceral organs or an increase in the relapse-free period following 36- and 55-month follow-ups.Conclusions. The findings of better late overall survival rates confirm the results of earlier studies of oral clodronate in combination with the conventional adjuvant therapy for BC.