- Risk of non-Hodgkin lymphoma associated with polymorphisms in folate-metabolizing genes. Lightfoot, T.J., Skibola, C.F., Willett, E.V., Skibola, D.R., Allan, J.M., Coppede, F., Adamson, P.J., Morgan, G.J., Roman, E., Smith, M.T. Cancer Epidemiol. Biomarkers Prev. (2005)