title: The undifferentiated malignant tumor, a continuing challenge.
authors.affiliation: University Hospital, New York University Medical Center, NY 10016.
authors.forename: H
authors.initials: H
authors.lastname: Feiner
mesh_terms: D002471:Cell Transformation, Neoplastic / Q000473:pathology*; D006801:Humans; D009369:Neoplasms / Q000175:diagnosis / Q000473:pathology*