More recent research of Mezquita et al. tried to answer the question if there is any link between the genetic diversity of non-small-cell lung cancer and exposure to indoor radon, Although it was conducted in a small group of patients the research led to the conclusion that indoor radon concentrations exceeded those recommended by WHO, and despite the fact that there were no differences between groups with EGFR, ALK, and BRAF patients, the concentrations above the WHO recommendations were most common with ALK rearrangement and BRAF mutation [119]. This evidence concerns the gene ALK and non-small cell lung carcinoma.