Other studies have demonstrated an association between NHL and myeloperoxidase (MPO) and glutathione peroxidase (GPX1) polymorphisms; a correlation was seen between FL and MPO (642G > A) and between marginal zone B-cell lymphoma (MZL) and GPX1 (Ex1-226C > T) [145,146]. This evidence concerns the gene GPX1 and marginal zone lymphoma.