但是，迄今为止尚无理想的肿瘤标记物。
However, still lack an ideal tumor marker of colorectal cancer.
血清CA12 5是迄今研究最广泛的肿瘤标记物之一。
Serum CA125 is one of the most widely studied tumor markers by now.
由于很少有健康的细胞制造这些酶，所以它们是一种可靠的肿瘤标记物。
Few healthy cells make these enzymes, so they are a reliable marker of tumours.
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