NOS2 and diffuse large B-cell lymphoma: Considering only the intake of red vegetables, it was observed that SNPs NOS1 (rs11068446) (CT or TT), NOS1 (rs3782221) (AG or AA), NOS1 (rs7298903) (CT or CC) and NOS2A (rs3729508) (CT or TT) resulted in a 1.7–2.2-fold of DLBCL in the low red vegetable consumption group, while the high consumption group had a 30–60% reduced risk of DLBCL.