Blackpantherz, I remember reading about the study done at the Univ of Birmingham. They used dr-70 and several other markers combined for colon cancer.
The result of the study proved that the combination was better than CEA alone but it was NOT a clinically useful test.
If you are attempting to say that the test was useful, I suggest you read the results of the study.
"RESULTS:
Class prediction models based on CEA, DR-70 and sCD26 produced a modest increase in detection accuracy over CEA alone, particularly for early stage cancers. The sensitivity and specificity required for a clinically useful test was not reached."