Potential of endoscopy, biopsy and cytology in the diagnosis and management of patients with cancer.
D001706:Biopsy; D003581:Cytodiagnosis; D004724:Endoscopy; D005243:Feces; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis*; D006801:Humans; D009780:Occult Blood; D012812:Sigmoidoscopy