Abstract：chest cancers were detected for the specific antibody IgG,IgM and circulating antigen (CAg) of Toxoplasma gonddi,the beneral infection rate was 34 4%,the infection rate(38 46%,20/52)was the highest in lung cancers.The infection rate in chest cancer who breeded cats was higher than those who didn't,it showed that breeding cats was an important factor in chest lung cancers who infected Toxoplasma. \ \
