Risk factor distribution (anthropometrics, sunlight and environmental exposures) by HLA-DRB1*01:01 and AH 8.1 (HLA-A*01-B*08-DR*03-TNF-308A) among controls in the NCI-SEER NHL multicenter case-control study (adjusted for age, education, sex, race, study center). Here, TNF is linked to non-Hodgkin lymphoma.