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Lv, Jia‐Wei; Qi, Zhen‐Yu; Zhou, Guan‐Qun; He, Xiao‐Jun; Chen, Yu‐Pei; Mao, Yan‐Ping; Chen, Lei; Tang, Ling‐Long; Li, Wen‐Fei; Lin, Ai‐Hua; Ma, Jun; Sun, Ying
Cancer science, March 2018, Volume: 109, Issue: 3Journal Article
To clarify the optimal cumulative cisplatin dose (CCD) in locoregionally‐advanced nasopharyngel carcinoma (NPC) patients receiving induction chemotherapy (IC) plus concurrent chemoradiotherapy (CCRT). Using the NPC‐specific database from the established big‐data intelligence platform at Sun Yat‐Sen University Cancer Center, 583 non‐disseminated, locoregionally‐advanced NPC patients receiving IC plus CCRT were enrolled. Propensity score matching (PSM) analysis was conducted to control for confounding factors. The median CCD was 160 mg/m2 after IC (range, 40‐300 mg/m2); only 74 patients (12.7%) achieved CCD >200 mg/m2. Patients receiving >200 mg/m2 CCD did not show significantly improved 5‐year overall survival (OS) (HR = 1.19; 95% confidence intervals CI 0.69‐2.06, P = .53) and progression‐free survival (PFS) (HR = 1.03; 95% CI: 0.63‐1.68, P = .92) compared with patients receiving <200 mg/m2 CCD. Further investigations of the potential of median CCD (160 mg/m2) to yield survival benefits revealed that there were no significant differences in survival endpoints between patients receiving CCD >160 mg/m2 and CCD < 160 mg/m2 in both the original and PSM cohorts. In addition, subgroup analysis indicated a favorable PFS, but not OS, with higher cisplatin administration in patients with pretreatment Epstein–Barr virus deoxyribonucleic acid (EBV DNA) <1000 copies/mL (HR = 0.26, 95% CI: 0.07‐0.93, P = .03) and receiving <3 IC cycles (HR = 0.59, 95% CI 0.33‐1.07, P = .08). Our analysis of real world data provided references for the optimal CCD in locoregionally‐advanced NPC receiving additional IC. The causal relationship between 200 mg/m2 CCD and improved survival was not defined; 160 mg/m2 CCD might be enough. However, for patients with EBV DNA <1000 copy/mL and receiving <3 IC cycles, a higher dose might be necessary. Our analysis of real world data provided references for the optimal CCD in locoregionally‐advanced NPC receiving IC plus CCRT. The causal relationship between 200 mg/m2 CCD and improved survival was not defined; 160 mg/m2 CCD might be enough. However, for patients with EBV DNA < 1000 copy/mL, and receiving<3 IC cycles, higher dose might be necessary.
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