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肿瘤是多细胞动物体细胞增殖和分化障碍的一种表现。从分子生物学及细胞学角度,肿瘤是体细胞基因调控的损伤或突然变异的结果;从病理学角度,肿瘤是体细胞的增殖和分化异常现象,呈现限制的增殖和不成熟的分化。胃癌不但是胃粘膜上皮细胞(腺上皮及表面上皮)的异常增殖和异常分化,或增殖与分化不协调的结果,而且经常变化的。不同的胃癌病人,或同一病人的不
Tumors are a manifestation of somatic cell proliferation and differentiation disorders in multicellular animals. From the perspective of molecular biology and cytology, tumors are the result of injury or sudden mutation of somatic cell gene regulation; from the perspective of pathology, tumors are abnormal phenomena of proliferation and differentiation of somatic cells, showing limited proliferation and immature differentiation. Gastric cancer is not only a result of abnormal proliferation and abnormal differentiation of gastric epithelial cells (glandular epithelium and surface epithelium), but also results in incoordination of proliferation and differentiation, and often changes. Different gastric cancer patients, or the same patient