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Objective  To explore the risk factors and predictive indexes of severe thrombocytopenia during concurrent radio-chemotherapy of nasopharyngeal carcinomas.    Methods  Retrospective analysis was performed from the hospitalized patients with nasopharyngeal carcinoma from August 2014 to July 2017, and induction chemotherapy and concurrent radio-chemotherapy were completed. According to the lowest platelet count during concurrent chemotherapy, patients were divided into observation and control groups. General information and laboratory examinations were recorded and analyzed by univariate analysis, multivariate regression analysis, and ROC curve analysis.    Results  Factors, including age, PLT, IBIL, APTT at first visit, WBC, RBC, HGB, PLT, NEUT, APTT, IBIL, FFA, Crea, and urea before radio-chemotherapy, which are significant in univariate analysis into multivariate regression analysis, were taken. It turned out that RBC (OR = 10.060, 95% CI 2.679–37.777, p = 0.001), PLT (OR = 1.020, 95% CI 1.006–1.034, p = 0.005), and IBIL (OR = 0.710, 95% CI 0.561–0.898, p = 0.004) are independent predictors of severe TP in NPC. ROC analysis showed that the AUC of RBC, IBIL, PLT, and AGE is 0.746 (p &amp;lt; 0.001), 0.735 (p &amp;lt; 0.001), 0.702 (p = 0.001), and 0.734 (p &amp;lt; 0.001). New variables called joint predictors were calculated by a regression equation (Y = 2.309 * RBC - 0.343 * IBIL + 0.02 * PLT - 10.007), the AUC of which is 0.8700 (p &amp;lt; 0.001); best truncation value is &amp;gt;5.87 mmol/l.    Conclusions  Lower RBC, PLT, and higher IBIL before concurrent radio-chemotherapy are independent risk factors causing severe TP during concurrent radio-chemotherapy of NPC. The RBC, PLT, and IBIL before concurrent radio-chemotherapy and joint predictor have a good predictive value to evaluate the risk of severe TP during concurrent radio-chemotherapy of NPC.

Risk Analysis of Severe Thrombocytopenia in Nasopharyngeal Carcinoma During Concurrent Radio-Chemotherapy