Predicitve factors of cisplatin (CDDP) discontinuation in concurrent chemoradiotherapy (CCRT) to locally advanced head and neck cancer patients

e17006 Background: CCRT is a standard therapy for locally advanced head and neck cancer patients, but some patients have intolerance to high dose density of CDDP. Predictive factors for CDDP discontinuation need to be investigated for making appropriate treatment decisions. Methods: We retrospectively analyzed nonmetastatic head and neck cancer patients treated with CCRT with CDDP (80 mg/m2 per 3 weeks) from November 2005 to April 2012 in our institute. Radiation therapy was performed as three-dimensional radiotherapy or intensity-modified radiotherapy (IMRT). Results: A total of 164 patients received CCRT, of which 89 (54 %) were Stage IV;. Primary sites were as follows; oral cavity 7, oropharynx 52, hypopharynx 53, larynx 14, nasopharynx 30, paranasal sinus/nasal cavity 3, and unknown primary 5. IMRT was performed to 54 (33 %) patients. Median follow-up time was 19 months (range 1-69 months); 1-year overall survival (OS) and progression free survival (PFS) were 90 % and 78 %. Non-Stage IV; and high creatinine clearance (>70 ml/min) were associated with longer OS in Cox proportional hazard model. As for CDDP treatment, 75 (46 %) patients completed 3 cycles of CDDP, 69 (42 %) patients received 2 cycles, and 20 (12 %) patients received only 1 cycle. The main reasons for CDDP discontinuation were infection (24 patients) and renal dysfunction (18 patients). In logistic regression analysis, male sex, younger age (< 61 years) and high body mass index (BMI) (>25) were associated with 3 cycles completion of CDDP statistically significantly (p = .002, odds ratio 6.622; p = .006, odds ratio 2.602; p = .035, odds ratio 2.655, respectively). Conclusions: In CCRT to head and neck cancer patients, infection and renal dysfunction were the main reasons for CDDP discontinuation. Sex, age and BMI could be predictive of CDDP completion/discontinuation.