In the present article, single immu nodiffussion and BA-EI ISA were employed io detect the serum IgG, IgA, IgM and IgE level of 192 patients with malignant tumours ( gastric carcinoma, lung cancel, breast cancer and malignant lymphoma ). The results showed that all the patients were associated with an increase in the IgG, IgA and IgE, especially with a noted increase in IgG and IgE. The IgG level was incre...