癌前疾病与癌前病变是两个相互有关,而又各自独立的不同的病变。前者为一种独立疾病,这种疾病在某种因素作用下,可以变成癌症,如溃疡病、着色性干皮病等。而癌前病变并不构成一种独立的疾病,常常为疾病发展过程中的一个阶段,它常是一种不稳定状态,在某些因素持续作用之下,可变成恶性肿瘤。相反,如果某种因素去除之,又可能恢复到正常状态, Precancerous lesions and precancerous lesions are two related to each other, but different independent of the lesion. The former is an independent disease, the disease under the influence of certain factors, can become cancer, such as ulcer disease, coloring of dry skin disease. However, precancerous lesions do not constitute an independent disease and are often a stage in the development of the disease. They are often an unstable condition that can become a malignant tumor under the continuous action of certain factors. On the contrary, if a certain factor is removed, it may return to normal state,