title: Comparison of the combined action of oxaliplatin or cisplatin and radiation in cervical and lung cancer cells.
abstract: OBJECTIVE
  To test the combined effects of oxaliplatin and radiation versus cisplatin and radiation using human cervical and lung cancer cell lines.
  
  
  METHODS
  CaSki cervical cancer cells, and A549 lung cancer cells were cultured under standard conditions. Cells were treated with escalating doses of gamma-irradiation (0-6 Gy), and with oxali- and cisplatin for 2 h or 24 h, or a combination of both. Cell survival was measured by a colony-forming assay. Survival curves were fitted to the data using the linear quadratic model. Sensitizer enhancement ratios (SER) were calculated at the 37% survival level, and isobologram analysis was applied to test for the drug-radiation interactions.
  
  
  RESULTS
  Oxaliplatin as well as cisplatin alone were cytotoxic in both cell lines. In CaSki cells, oxaliplatin and cisplatin significantly increased radiation toxicity. In A549 cells no increase of radiation toxicity was observed after treatment with cisplatin, however, isobologram analysis revealed supra-additive interaction between oxaliplatin and radiation in A549 cells.
  
  
  CONCLUSIONS
  Oxaliplatin had the same effectiveness on tumor cells as cisplatin and induced enhanced radiation toxicity in lung cancer cells, where cisplatin was not able to achieve radiosensitization.
authors.affiliation: Georg-August-Universität Göttingen-Bereich Humanmedizin-, Klinik für Strahlentherapie und Radioonkologie, Göttingen, Germany. mfraenk@med.uni-goettingen.de
authors.forename: Margret
authors.initials: M
authors.lastname: Rave-Fränk
authors.forename: Heinz
authors.initials: H
authors.lastname: Schmidberger
authors.forename: Hans
authors.initials: H
authors.lastname: Christiansen
authors.forename: Christine
authors.initials: C
authors.lastname: Boll
authors.forename: Jörg
authors.initials: J
authors.lastname: Lehmann
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Weiss
mesh_terms: D000970:Antineoplastic Agents / Q000627:therapeutic use*; D002945:Cisplatin / Q000627:therapeutic use*; D003131:Combined Modality Therapy; D004305:Dose-Response Relationship, Drug; D004307:Dose-Response Relationship, Radiation; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology / Q000628:therapy*; D009944:Organoplatinum Compounds / Q000627:therapeutic use*; D000077150:Oxaliplatin; D011838:Radiation-Sensitizing Agents / Q000627:therapeutic use; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000528:radiation effects; D002583:Uterine Cervical Neoplasms / Q000473:pathology / Q000628:therapy*
chemical_list: D000970:Antineoplastic Agents; D009944:Organoplatinum Compounds; D011838:Radiation-Sensitizing Agents; D000077150:Oxaliplatin; D002945:Cisplatin