Commentary regarding "Residential radon and small cell lung cancer. A systematic review".

Rodríguez-Martínez et al. proposed a systematic review of residential radon and small cell lung cancer. Although this is a noteworthy project, it must utilize the complete set of radon data and provide a rigorous analysis of these data. The authors utilized a selected set of radon data, and do not utilize rigorous statistical methods in relating the effects of radon and small cell lung cancer. These limitations detract from the conclusions of the systematic review.