Pitfalls in the early diagnosis of cancer.
D000230:Adenocarcinoma / Q000175:diagnosis; D000368:Aged; D001943:Breast Neoplasms / Q000175:diagnosis; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis; D005153:Facial Neoplasms / Q000175:diagnosis; D005260:Female; D006801:Humans; D008207:Lymphatic Metastasis; D008297:Male; D008722:Methods; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000175:diagnosis; D009369:Neoplasms / Q000175:diagnosis*; D012004:Rectal Neoplasms / Q000175:diagnosis; D013274:Stomach Neoplasms / Q000175:diagnosis; D013997:Time Factors