GSTM1 and pulmonary arterial hypertension: Our findings related to polymorphisms in GSTM1 and PAH–DNA adduct formation are in contrast with one study (Rundle et al. 2003), while being consistent with others that report no significant difference in detectable PAH–DNA adducts based on GSTM1 status (Grinberg-Funes et al. 1994; Rothman et al. 1995; Weiserbs et al. 2003).