Second, serological biomarkers associated with cervical cancer, such as carbohydrate antigen 125 (CA125), carbohydrate antigen 153 (CA153), carbohydrate antigen 199 (CA199) and carcinoembryonic antigen (CEA), were not used to build predictive models due to too much missing data. The gene discussed is CEACAM5; the disease is cervical carcinoma.