the present study , carried out on a series of 376 patients affected by gastrointestinal tumors of which 79 were of the stomach ( 9 with hepatic metastases ) , 133 of the colon and higher sigmoid ( 25 with hepatic metastases ) , and 164 of the lower sigmoid and rectum ( 29 with hepatic metastases ) , proposed to establish by use of a statistical method the optimal threshold of the cea test that would give the best diagnostic specificity of the combined cea test and liver scan without any relevant loss of sensitivity .
C0009368
colon
C0227391
sigmoid