J Cancer 2017; 8(13):2614-2625. doi:10.7150/jca.17847

Research Paper

Profiling chemotherapy-associated myelotoxicity among Chinese gastric cancer population receiving cytotoxic conventional regimens: epidemiological features, timing, predictors and clinical impacts

Ci Zhu1, Yan Wang1, Xicheng Wang2, Chunmei Bai3, Dan Su4, Bing Cao5, Jianming Xu1✉

1. Beijing 307 People's Liberation Army Hospital Cancer Centre, Beijing, China
2. Department of Gastrointestinal Oncology, Beijing Cancer Hospital, Beijing, China
3. Department of Gastrointestinal Oncology, Peking Union Medical College Hospital, Beijing, China
4. Oncology Department, No. Chinese PLA General Hospital, Beijing, China
5. Department of Medical Oncology, Fudan University Shanghai Cancer Center, Shanghai, China

Abstract

Objectives: We aim to evaluate the epidemiological features, timing, predictors and clinical impacts of chemotherapy-associated myelotoxicity in Chinese gastric cancer population receiving six established cytotoxic conventional regimens (CF/XP, EC(O)F/EC(O)X, DC(O)F/DC(O)X, PC(O)F/PC(O)X, FOLFOX4, or mFOLFOX7/XELOX).

Patients and methods: A 4-year multicenter, prospective, observational study was conducted in multiple hospitals/institutes spanning three major regions in China. A total of 1,285 patients with gastric cancer, treated with six selected regimens between 2010 and 2014 were included. Kaplan-meier analysis was applied to estimate the time to develop myelotoxicity events for each regimen. Multivariable logistic regression model was built to identify predictors associated with chemotherapy-induced myelotoxicity, evaluating detailed specific factors of patients, disease and treatment patterns.

Results: Triplet regimens were associated with more moderate-to-severe myelotoxicity events than doublet regimens. DC(O)F/DC(O)X group presented with moderate-to-severe anaemia, thrombocytopenia, and leukopenia earlier than other regimen groups, with median time of 3.5, 4.8 and 3.3 cycles, respectively. PC(O)F/PC(O)X group had a shortest time to develop Moderate-to-Severe neutropenia (median time, 3.3 cycles). Multivariate analysis identified several independent predictors for moderate-to-severe myelotoxicity, including: baseline Hb<12.0 g/dL, male gender, KPS<80, previously treated with surgery, tumor located at gastroesophageal junction(GEJ), DC(O)F/DC(O)X regimen, palliative intent, triplet combination therapy and No. of cycles received≥4. Dose reductions≥20% occurred in 16.7% of patients and treatment delays≥7 days presented in 21.1% of patients, resulting in patients receiving an actual average Relative Dose Intensity (RDI) of 0.733.

Conclusions: Myelotoxicity events were frequently observed within the gastric cancer population undertaking multicycle polychemotherapy. Predictive models based on risk factors identified for moderate-to-severe myelotoxicity should enable the targeted use of appropriate supportive care in an effort to facilitate the delivery of full chemotherapy doses on schedule.

Keywords: gastric cancer, anaemia, thrombocytopenia, neutropenia, leukopenia

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How to cite this article:
Zhu C, Wang Y, Wang X, Bai C, Su D, Cao B, Xu J. Profiling chemotherapy-associated myelotoxicity among Chinese gastric cancer population receiving cytotoxic conventional regimens: epidemiological features, timing, predictors and clinical impacts. J Cancer 2017; 8(13):2614-2625. doi:10.7150/jca.17847. Available from http://www.jcancer.org/v08p2614.htm