AHR and non-Hodgkin lymphoma: In a large, population-based case–control study of 422 NHL cases and 459 controls, Ng et al. (2010) identified a significant interaction (p = 0.013) between a single nucleotide polymorphism (SNP) in the AhR gene and increasing quartiles of PCB-118, thus suggesting that AhR gene variants may modify the effect of PCBs on risk of NHL.