precancerous

形容词 precancerous:

1. of or relating to a growth that is not malignant but is likely to become so if not treated

pre.can.cer.ous

adj.（形容词）
Of, relating to, or being a condition that typically precedes or develops into a cancer:
癌症前期的，可能癌变的：癌症前的或发展成癌症之前的状况的，与之有关的或处于其中的：
例句：
a precancerous growth.
癌症前期的恶化