Effect of Bleomycin Administration on the Development of Pulmonary Toxicity in Patients With Metastatic Germ Cell Tumors Receiving First-Line Chemotherapy: A Meta-Analysis of Randomized Studies
In a trial-level meta-analysis of randomized studies, bleomycin administration was independently significantly associated with the development of pulmonary toxicity in patients with metastatic germ cell tumors receiving first-line chemotherapy. This effect was mainly seen with respect to all-Grade pulmonary toxicity. This study provided a further argument in favor of reducing the burden of curative chemotherapy in these highly curable malignancies.Background:
Limited information is available about the effect of bleomycin administration on the development of pulmonary toxicity in metastatic germ cell tumors (GCT).Patients and Methods:
A literature search was conducted to identify randomized trials of first-line chemotherapy for GCT. We conducted univariate and multivariate analyses using random effects models to evaluate the predictive role of bleomycin administration in the development of all Grade and Grade 3 to 4 (G3-4) pulmonary toxicity. The results were adjusted for length of follow-up, prognostic risk group, year of treatment, presence of lung metastases, and primary mediastinal GCT.Results:
Fifty-three study arms of 25 phase II and III trials encompassing 6498 patients were selected: 40 that used bleomycin (n = 5093) and 13 that did not (n = 1405). The pooled probability of all-Grade pulmonary toxicity in the bleomycin and nonbleomycin arms was 11.7% (95% confidence interval [CI], 8.4%-16.0%) and 1.7% (95% CI, 0.7%-4.2%), respectively. Univariate analysis indicated that bleomycin administration was associated with the incidence of all-Grade (odds ratio [OR], 7.57; 95% CI, 2.84-20.18; Wald test P < .001) and G3-4 pulmonary toxicity (OR, 5.19; 95% CI, 1.57-17.16; P = .007). Multivariate analysis showed a significant association of bleomycin administration with the incidence of all-Grade pulmonary toxicity (OR, 4.14; 95% CI, 1.36-12.59; P = .012) and a trend toward significance for G3-4 toxicity (OR, 2.24; 95% CI, 0.91-5.51; P = .080).Conclusion:
We quantified the bleomycin-associated effect on the development of pulmonary toxicity in patients with GCT who received first-line chemotherapy. This information might be useful for planning clinical trials aimed at reducing chemotherapy as well as to inform patients in the clinic.