Toxoplasma gondii antibodies in cancer patients.

To determine Toxoplasma gondii antibodies in cancer patients, 267 cancer patients were studied using ELISA and higher positivity rates of T. gondii IgG were detected than the control. The positivity rates of T. gondii IgG in nasopharyngeal carcinoma, rectal cancer groups were significantly higher than the other cancer groups, but the differences in IgM positivity rates were not significant, demonstrating that there is a likely association between T. gondii infection and some kinds of cancer, especially nasopharyngeal carcinoma and rectal cancer.