Quimioterapia: acesso aberto
Acesso livre
ISSN: 2167-7700
ISSN: 2167-7700
Bei Zhang, Wenzhuo He, Feifei Zhou, Guifang Guo, Chang Jiang, Chenxi Yin, Xuxian Chen, Huijuan Qiu, Yuming Rong and Liangping Xia
Background: The effectiveness of Bevacizumab has been demonstrated for the treatment of metastatic colorectal cancer. However, the minimum number of bevacizumab cycles needed to improve overall survival is unknown. In addition, anti-angiogenic treatment has been shown in preclinical studies to accelerate metastasis. To investigate these two issues, we performed a retrospective case-control study in Chinese patients with metastatic colorectal cancer. Methods: Patients initially diagnosed as metastatic colorectal cancer at the Sun Yat-sen University Cancer Center from 2004 to 2010 were recruited. All patients treated with bevacizumab served as experimental group; patients not treated with bevacizumab were control group. The primary endpoints were overall survival and the incidence of new metastatic lesions in the liver and other organs. Results: Patients received more than 4 cycles of bevacizumab showed a significantly prolonged overall survival than patients in the control group. The median overall survival was 31.53 months (95% CI, 23.22-39.85 months) and 19.70 months (95% CI, 16.61-22.79 months; P=0.031) for the experimental and control groups, respectively. The patients receiving bevacizumab more than 3 times showed an increased risk compared to the patients in control group of developing new metastatic lesions in the liver (17/23 versus 25/55, respectively, P=0.022) and other organs (14/23 versus 19/55, respectively, P=0.032). Conclusion: More than 4 doses of bevacizumab were required to improve overall survival in metastatic colorectal cancer; a potentially accelerated metastasis rate was observed after more than 3 doses of bevacizumab. However, studies with larger patient sample sizes are urgently needed to validate our findings.