AMFR and non-Hodgkin lymphoma: Compared with the healthy, patients with NK/T cell tumors had a significantly higher levels of IgG-EA (P = 0.03), and higher levels of IgA-EA and IgA-gp125 (P > 0.05), and a lower level of IgG-gp78 (P > 0.05); patients with NHL except for NK/T cell tumors had higher levels of IgA-EA and IgG-EBNA1 (P > 0.05).