title: Chemotherapy of metastatic testicular germ cell tumors: relationship of histologic response to size reduction and changes in tumor markers.
abstract: BACKGROUND
  Although testicular germ cell tumor is one of the most curable cancers, approximately 20% of advanced cases remain incurable. In this study we investigate factors that may predict a poor response to standard chemotherapeutic regimens and thus allow earlier initiation of more aggressive measures.
  
  
  METHODS
  We analyzed the records of 19 patients with metastatic testicular germ cell tumors (8 seminomas and 11 nonseminomas). Sixteen patients underwent surgical exploration for residual tumors following chemotherapy, and the histological findings on the resulting specimens were correlated with reductions in tumor size observed on computed tomography and with changes in tumor marker levels.
  
  
  RESULTS
  Complete necrosis was obtained in 10 of 12 lesions that shrank by at least 80%, while continued existence of teratoma or cancer was confirmed in 9 of 11 lesions with smaller size reductions. An initial human chorionic gonadotropin-beta subunit (HCG-beta) level more than 100 times the upper limit of normal appeared to predict poor histological response (teratoma/cancer) to chemotherapy. Slow fall (prolonged half-life) of tumor markers during chemotherapy also correlated with poor histological response.
  
  
  CONCLUSIONS
  Factors which predict poor histological response of tumors to chemotherapy include size reduction less than 80%, initial HCG-beta levels more than 100 times the upper limit of normal, and prolonged half-life of tumor markers (placental alkaline phosphatase, alpha-fetoprotein and HCG-beta).
authors.affiliation: Department of Urology, Kanazawa University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Koshida
authors.forename: Y
authors.initials: Y
authors.lastname: Kadono
authors.forename: H
authors.initials: H
authors.lastname: Konaka
authors.forename: Y
authors.initials: Y
authors.lastname: Kitagawa
authors.forename: T
authors.initials: T
authors.lastname: Imao
authors.forename: T
authors.initials: T
authors.lastname: Kobayashi
authors.forename: K
authors.initials: K
authors.lastname: Kunimi
authors.forename: T
authors.initials: T
authors.lastname: Uchibayashi
authors.forename: M
authors.initials: M
authors.lastname: Namiki
mesh_terms: D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D014408:Biomarkers, Tumor / Q000097:blood; D018997:Chorionic Gonadotropin, beta Subunit, Human / Q000097:blood; D003131:Combined Modality Therapy; D004354:Drug Screening Assays, Antitumor; D018237:Germinoma / Q000188:drug therapy* / Q000473:pathology / Q000556:secondary*; D006207:Half-Life; D006801:Humans; D008175:Lung Neoplasms / Q000556:secondary; D008207:Lymphatic Metastasis; D008297:Male; D013736:Testicular Neoplasms / Q000188:drug therapy* / Q000473:pathology; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor; D018997:Chorionic Gonadotropin, beta Subunit, Human