Lower gastrointestinal (GI) bleeding with different causes was studied with fiberoptic coloscopy in 022 patients,and the endoscopic features were discussed.Of the 922 cases,colonic polyps were identified in 354 cases (38.4%),and neoplastic polyps in 10 (5.36%).in which villous adenomas was the most common,accounting for 47%.Large intestinal cancers were diagnosed in 134 cases (14.5%) and inflammatory bowel disease in 50 cases (5.4%).The etiology of the bleeding also included infectious diseases in colon,such as tuberculosis,amebiasis,schistosomiasis,idiopathic solitary colonic ulcer.Rarer causes of the lower GI hemorrhage included di-verticulum,hemangioma and trichuriasis.

The expression of human epidermal growth factor (hEGF) and hEGF receptor (hEGF-R) was examined by 125I-labeled-hEGF binding analysis in 21 cases of colonic carcinomas. No significant difference was found in the values of hEGF binding among carcinoma, paracarcino-ma regions and regions far away from carcinoma, but the values in all of them were higher than that in normal colonic tissues (P

Objective:To investigate the relationship between the department where patients with nasopharyngeal carcinomas was first admitted and the delayed diagnoses(or misdiagnosis).Methods:The data of 1998 cases of nasopharyngeal carcinomas were collected and analyzed.Results:The department of otolaryngology and the radiation oncology have the high correction rates for the first diagnosis,but misdiagnosis rates in departments of surgical,internal medicine and traditional Chinese medicine were very poor.Conclusion:The clinical knowledge about nasopharyngeal carcinomas was the most important factor for the first diagnoses.