【摘 要】
：
Current investigation for patients with colorectal symptoms without overt rectal bleeding is undertaken by colonoscopy or by flexible sigrnoidoscopy and barium enema.A large majority of patients do no
【机 构】
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Department of Surgery University Hospital Aintree UK
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Current investigation for patients with colorectal symptoms without overt rectal bleeding is undertaken by colonoscopy or by flexible sigrnoidoscopy and barium enema.A large majority of patients do not have colorectal cancer.There exists no instant, objective measure to discriminate patients who are likely to have colorectal cancer and therefore require expedient investigation.
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