[Evaluation of the tests for investigation of occult blood in the feces in malignant neoplasms of the upper portion of the digestive tract].
D004938:Esophageal Neoplasms; D005243:Feces; D006801:Humans; D009369:Neoplasms; D009780:Occult Blood; D013274:Stomach Neoplasms / Q000175:diagnosis*
ESOPHAGUS/neoplasms; STOMACH NEOPLASMS/diagnosis