Xinji Zhang1, Jiajie Zang1, Jinfang Xu1, Chong Bai2, Yingyi Qin1, Ke Liu3, Cheng Wu1, Meijing Wu1, Qian He1, Shanshan Zhang4, Lixin Wei4, Jia He5. 1. Department of Health Statistics, Second Military Medical University, Shanghai, China. 2. Respiratory Department, Changhai Hospital, Second Military Medical University, Shanghai, China. 3. Department of Medical Oncology, Changzheng Hospital, Second Military Medical University, Shanghai, China. 4. Tumor Immunology and Gene Therapy Center, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai, China. 5. Department of Health Statistics, Second Military Medical University, Shanghai, China. Electronic address: hejia63@yahoo.com.
Abstract
BACKGROUND: Maintenance therapy for patients with non-small cell lung cancer (NSCLC) has gained extensive interest. Varying results for this treatment underpin the need for a synthesis of evidence. METHODS: Trials investigating maintenance therapy with either a continuous or a switch strategy for patients with nonprogressing NSCLC compared with placebo or observation were identified. The primary outcome was overall survival (OS), and secondary outcomes included progression-free survival (PFS) and toxicity. RESULTS: Eight trials of 3,736 patients were included in the analysis. Switch maintenance therapy substantially improved OS compared with placebo or observation (hazard ratio [HR], 0.85; 95% CI, 0.79-0.92; P < .001). A similar trend of improved OS was found in continuous maintenance therapy, despite lacking statistical significance (HR, 0.88; 95% CI, 0.74-1.04; P = .124). The interaction test suggested that the difference in OS between the two maintenance strategies was not statistically significant (P = .777). Clinically substantial and statistically significant improvement in PFS was found with both maintenance strategies (switch maintenance therapy HR, 0.67; 95% CI, 0.57-0.78; continuous maintenance therapy HR, 0.53; 95% CI, 0.43-0.65; interaction P = .128). Subgroup analyses revealed no statistically significant differences in OS or PFS between switch maintenance therapy with cytotoxic agents and that with tyrosine kinase inhibitor agents. Toxicity was greater in maintenance therapy. CONCLUSIONS: Maintenance therapy with either a continuous or a switch strategy significantly increases OS and PFS compared with placebo or observation. However, the benefits must be balanced against toxicity.
BACKGROUND: Maintenance therapy for patients with non-small cell lung cancer (NSCLC) has gained extensive interest. Varying results for this treatment underpin the need for a synthesis of evidence. METHODS: Trials investigating maintenance therapy with either a continuous or a switch strategy for patients with nonprogressing NSCLC compared with placebo or observation were identified. The primary outcome was overall survival (OS), and secondary outcomes included progression-free survival (PFS) and toxicity. RESULTS: Eight trials of 3,736 patients were included in the analysis. Switch maintenance therapy substantially improved OS compared with placebo or observation (hazard ratio [HR], 0.85; 95% CI, 0.79-0.92; P < .001). A similar trend of improved OS was found in continuous maintenance therapy, despite lacking statistical significance (HR, 0.88; 95% CI, 0.74-1.04; P = .124). The interaction test suggested that the difference in OS between the two maintenance strategies was not statistically significant (P = .777). Clinically substantial and statistically significant improvement in PFS was found with both maintenance strategies (switch maintenance therapy HR, 0.67; 95% CI, 0.57-0.78; continuous maintenance therapy HR, 0.53; 95% CI, 0.43-0.65; interaction P = .128). Subgroup analyses revealed no statistically significant differences in OS or PFS between switch maintenance therapy with cytotoxic agents and that with tyrosine kinase inhibitor agents. Toxicity was greater in maintenance therapy. CONCLUSIONS: Maintenance therapy with either a continuous or a switch strategy significantly increases OS and PFS compared with placebo or observation. However, the benefits must be balanced against toxicity.
Authors: Madhusmita Behera; Taofeek K Owonikoko; Zhengjia Chen; Scott A Kono; Fadlo R Khuri; Chandra P Belani; Suresh S Ramalingam Journal: Lung Cancer Date: 2012-04-28 Impact factor: 5.705