The invention discloses the specificity marker 
protein TS / MEDP 
antibody preparation and the purpose. The 
molecular biology technology is utilized, and a new 
gene is cloned in a 
stomach cancer cell and is named as TS / MDEP. A polyclonal 
antibody for preventing the TS / MDEP is prepared, and a high specificity 
antibody is acquired through the antibody purification technology. The expression characteristics of the TS / MDEP 
gene in a tumor 
cell line and a tumor 
cell tissue are verified from the mRNA and 
protein level, the expression in 14 tumor cell lines including the tumor cell line is determined, the dependance of 
cell cycle is assumed, the excess expression exists in 
stomach cancer, 
breast cancer and 
cervical cancer tissues, no expression is in the corresponding normal tissues, and the expression exists in an 
embryo tissue. The high expression of the TS / MDEP in the 
embryo tissue with exuberant cell proliferation is validated, after growing up, the 
gene is closed, and the high expression exists in the 
tumor cells. The TS / MDEP has the seasonal specificity expression to clew the occurrence and the development of the 
cell cycle control abnormity caused by the high expression of the TS / MDEP. The obtained antibody for preventing the TS / MDEP can be used to monitor the 
cell cycle advancement and the clinical biological behavior of the gastroenteric tumor.