Osteonecrosis of the jaw (ONJ) in cancer patients (pts) treated with bisphosphonates (B): Results of a monoinstitutional monitoring program

Abstract

19601 Background: B reduce bone metastases complications. ONJ is a serious adverse event during B treatment. Therefore, it's necessary to identify some procedures to reduce ONJ injures in a monitoring program. Patients and Methods: We retrospectively reviewed how an active program of prevention based on clinical oral cavity examination, dentists and pts education might improve ONJ outcome in pts receiving pamidronate (P) 90 mg monthly or zoledronate (Z) 4 mg monthly. Results: from October 2003 to October 2006, 154 consecutive pts were treated; 95 females, 59 males; primary tumors: 66 breast, 28 prostate, 26 lung, 9 myeloma, 4 NHL, 21 other. In June 2005 the monitoring program started on all our pts. ONJ was diagnosed in 15/154 (9.7%) pts, 8 before and 7 after June 2005; all pts were treated with Z (total 2,987 courses, range 8–43; median courses/pt 19.4) and 4 pts pretreated also with P (total 124 courses, range 12–43, median courses/pt 31. Tumors: 7 breast, 1 kidney, 2 lung, 1 head-neck, 1 thyroid, 1 NHL, 1 prostate, 1 sarcoma. Concomitant therapies: 14 pts chemotherapy; 7 hormonotherapy; 2 head-neck radiotherapy; 5 steroids. Significant anamnesis: 9 recent dentoalveolar procedures, 4 diabetes. First symptoms: multiple recurrent alveolar abscesses 9, pain 3, dental mobility 1, paresthesia of the lower lip 1, exposed bone 1. Main treatments were: antibiotics and antifungals 11, curettages 3, surgical resections 4 (1 partial maxillectomy, complicated by septic shock and oronasal communication, 2 partial mandibulectomies, 1 segmental mandibular resection). These last 4 pts, that had the worst prognosis, were diagnosed before starting the monitoring program, and they had been treated with aggressive dental procedures at the exordium. 7 new ONJ cases, diagnosed after June 2005 were successfully treated without aggressive dentist interventions, achieving a good control. Conclusions: We remark that ONJ B related is a frequent adverse event (9.7%), especially with Z. A monitoring program based on non- surgical treatment and patients and physicians education may improve its management. No significant financial relationships to disclose.