title: The effect of chemotherapy on osteosarcoma.
abstract: The aim of this study was to evaluate the effect of chemotherapy on osteosarcoma by comparing the histologic pattern of primary tumors with that of their metastases. Therefore the primary tumors and metastases in 11 patients were macroscopically and histologically classified according to the Enneking and Broder systems as well as our own method. Three of 11 patients developed metastases with a less malignant pattern, 8 patients developed metastases which were as malignant as the primary tumor. The chemotherapeutics used had either an insubstantial effect or none at all on the differentiation of immature tumorous structures in the metastases and treatment did not lead to the expected improvement. Only the patients in whom, according to our own system, the primary tumors were classified as less malignant, are still alive.
authors.affiliation: Department of Pathologic Anatomy and Orthopaedics, University Hospital St. Radboud, Nijmegen, The Netherlands.
authors.forename: H M
authors.initials: HM
authors.lastname: Klein Nagelvoort
authors.forename: K
authors.initials: K
authors.lastname: Kubat
authors.forename: J
authors.initials: J
authors.lastname: van Horn
mesh_terms: D000293:Adolescent; D000328:Adult; D001859:Bone Neoplasms / Q000188:drug therapy* / Q000473:pathology / Q000556:secondary; D002471:Cell Transformation, Neoplastic / Q000473:pathology; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D012516:Osteosarcoma / Q000188:drug therapy* / Q000473:pathology / Q000556:secondary; D011379:Prognosis