癌前病变是指机体组织器官中某些可能演变成癌的病理变化。当物理、化学、生物等因素不停地刺激机体中的任何一个部位,经过一定时间以后,病变中的一部分细胞就可能演变成为癌细胞。如胃炎、胃溃疡与胃癌、食道炎与食管癌,肝炎、肝硬化与肝癌,子宫颈炎与子宫颈癌等等。因此,积极预防与治疗癌前病变,对预防肿瘤的发生有重要意义。下面介绍几种常见的癌前病变。 1.皮肤及粘膜的前病变较为多见,且容易发现。还常见的有白斑、慢性溃疡、瘘管、黑痣、皮肤角化症等。白斑好发在口腔、外阴、子宫颈等处。表现为上皮增厚、粗糙,呈灰白色。若出现糜烂,则可能已经癌变。皮肤慢性溃疡,持续三个月以上不愈者,就有可能癌变。疤痕发痒,破溃,经久不愈,该彻底处治。瘘管不愈者,应及早切除,皮肤黑痣出现发痒、破溃、迅速长大等,应及时切除,否则有变成恶性黑色素瘤的可能。皮肤角化症常发生在老年人面部、手背等露部位,呈皮肤粗 Precancerous lesions refer to the pathological changes that some tissues and organs may evolve into cancers. When physical, chemical, biological and other factors continue to stimulate any part of the body, after a certain period of time, the lesion in a part of the cells may evolve into cancer cells. Such as gastritis, gastric ulcer and gastric cancer, esophagitis and esophageal cancer, hepatitis, cirrhosis and liver cancer, cervicitis and cervical cancer and so on. Therefore, active prevention and treatment of precancerous lesions, the prevention of tumor occurrence of great significance. Here are some common precancerous lesions. 1. Skin and mucosal anterior lesions are more common, and easy to find. Also common white spots, chronic ulcers, fistula, mole, skin keratosis and so on. Wrinkles occur in the mouth, vulva, cervix and other places. The performance of epithelial thickening, rough, gray white. If erosion occurs, it may have become cancerous. Chronic skin ulcers, who sustained more than three months, may have cancer. Scar itching, ulceration, prolonged healing, the thorough treatment. Fistula nonunion, should be removed as soon as possible, the skin mole appears itchy, rupture, rapid growth, etc., should be promptly removed, or have the potential to become malignant melanoma. Skin keratosis often occurs in the elderly face, back and other exposed parts of the skin rough