HLA-DRB1 and non-Hodgkin lymphoma: The risk estimates for family history of NHL were generally similar but statistically significant for HLA-DRB1*01:01 (OR = 2.81, 95% CI = 1.12–7.05) but not AH 8.1 (OR = 2.35, 95% CI = 0.81–6.82).