Second or third additional chemotherapy drug for non‐small cell lung cancer in patients with advanced disease
Abstract
Background
Randomized trials have demonstrated that adding a drug to a single‐agent or to a two‐agent regimen increased the tumor response rate in patients with advanced non‐small cell lung cancer (NSCLC), although its impact on survival remains controversial.
Objectives
To evaluate the clinical benefit of adding a drug to a single‐agent or two‐agent chemotherapy regimen in terms of tumor response rate, survival, and toxicity in patients with advanced NSCLC.
Search methods
There were no language restrictions. Searches of MEDLINE and EMBASE were performed using the search terms non‐small cell lung carcinoma/drug therapy, adenocarcinoma, large‐cell carcinoma, squamous‐cell carcinoma, lung, neoplasms, clinical trial phase III, and randomized trial. Manual searches were also performed to find conference proceedings published between January 1982 and June 2006.
Selection criteria
Data from all randomized controlled trials performed between 1980 and 2006 (published between January 1980 and June 2006) comparing a doublet regimen with a single‐agent regimen or comparing a triplet regimen with a doublet regimen in patients with advanced NSCLC.
Data collection and analysis
Two independent investigators reviewed the publications and extracted the data. Pooled odds ratios (ORs) for the objective tumor response rate, one‐year survival rate, and toxicity rate were calculated using the fixed‐effect model. Pooled median ratios (MRs) for median survival also were calculated using the fixed‐effect model. ORs and MRs lower than unity (< 1.0) indicate a benefit of a doublet regimen compared with a single‐agent regimen (or a triplet regimen compared with a doublet regimen).
Main results
Sixty‐five trials (13601 patients) were eligible. In the trials comparing a doublet regimen with a single‐agent regimen, a significant increase was observed in tumor response (OR 0.42, 95% confidence interval [CI] 0.37 to 0.47, P < 0.001) and one‐year survival (OR 0.80, 95% CI 0.70 to 0.91, P < 0.001) in favor of the doublet regimen. The median survival ratio was 0.83 (95% CI 0.79 to 0.89, P < 0.001). An increase also was observed in the tumor response rate (OR 0.66, 95% CI 0.58 to 0.75, P < 0.001) in favor of the triplet regimen, but not for one‐year survival (OR 1.01, 95% CI 0.85 to 1.21, P = 0.88). The median survival ratio was 1.00 (95% CI 0.94 to 1.06, P = 0.97).
Authors' conclusions
Adding a second drug improved tumor response and survival rate. Adding a third drug had a weaker effect on tumor response and no effect on survival.
PICOs
Plain language summary
Adding a second drug improved tumor response rate and survival rate in advanced non‐small cell lung cancer (NSCLC). Adding a third drug had a weaker effect on tumor response and no effect on survival
Randomized trials have demonstrated that adding a drug to a single‐agent or to a two‐drug regimen increased the tumor response in patients with NSCLC, although its impact on survival remains controversial. Sixty‐five trials (13601 patients) were eligible in this meta‐analysis. Adding a second drug to a single‐agent chemotherapy regimen significantly improved the objective tumor response rate and the survival. The addition of a third drug to a two‐agent chemotherapy regimen increased the objective tumor response rate, but with a weaker effect and a higher toxicity and without improving survival.
