553 Background: Although the cardiotoxicity associated with 5-Fluorouracil (5-FU) or capecitabine administration has been well addressed in literature, there is still a lack of data from prospective clinical trials in Chinese population. The aim of this study was to evaluate the incidence, manifestations and predisposing factors for the cardiotoxicity in Chinese cancer patients treated 5-FU or capecitabine. Methods: A multicenter prospective observational study was performed in 527 patients with various solid tumors from 12 cancer centers in china . Of these patients, 196 received 5-FU-based and 331 received oral capecitabine-based chemotherapy as either first-line or adjuvant therapy. Outcome measures including electrocardiogram(ECG), myocardial enzymes, cardiac troponin(cTn), BNP and echocardio- graphy(UCG) etc. Univariate analysis and the logistic regression were performed for subgroup analysis and identification of the significant independent variables that are associated with cardiotoxicity of both agents. Results: In total, 161 of 527 patients (30.55%) experienced cardiotoxicity. The incidence of cardiotoxicity was 33.84% (112 out of 331) in the capecitabine-treated population, significantly higher than 25 %( 49 out of 196) in the 5-FU treated population (P = 0.0042). 110 out of 527 patients (20.87%) suffered arrhythmia, 105/527 (19.92%) developed ischemic changes, while 20/527(3.80%) heart failure and 6/527 (1.14%) myocardial infarction only. Among the factors evaluated with univariate analysis and the logistic regression, a history of cardiac disease, chemotherapy agent, duration of treatment and hypertension were significant with cardiotoxicity occurrence. The odds ratio were 15.447(with a history of cardiac history vs without), 2.118 (Capecitabine group vs 5-FU group), 1.079(5-8 vs 1-4 cycles) and 1.698 (with hypertension vs without) respectively. Conclusions: Cardiotoxicity induced by fluoropyrimidines in Chinese population may be underestimated in clinical practice.Possible risk factors are duration of treatment, chemotherapy agents, preexisting cardiac disease and hypertension.
572P Cardiotoxicity in Chinese cancer patients treated with 5- fluorouracil or capecitabine: A multicenter prospective observational study
