title: Development of drug resistance in a human epidermoid lung carcinoma xenograft line.
abstract: The development of resistance to vincristine, actinomycin D and cisplatin has been examined in a human epidermoid lung carcinoma xenograft line (HXL 55) growing in nude mice. Treatment of HXL 55 with 1 mg kg-1 vincristine or 0.5 mg kg-1 actinomycin D once in each in vivo passage resulted in a rapid reduction in tumour responsiveness to these drugs. A partial resistance was already acquired at the 2nd transplant generation. In contrast, a gradual decrease in therapeutic response was observed with 10 mg kg-1 cisplatin. Irradiation with a local dose of 10 Gy induced no resistance. The three induced drug-resistant sublines were characterized in terms of the time course of development of resistance, the degree of induced resistance, cross-resistance, growth rate and stability of the phenotype.
authors.affiliation: Institute of Experimental Pathology, German Cancer Research Center, Heidelberg.
authors.forename: J
authors.initials: J
authors.lastname: Mattern
authors.forename: M
authors.initials: M
authors.lastname: Bak
authors.forename: K H
authors.initials: KH
authors.lastname: Hoever
authors.forename: M
authors.initials: M
authors.lastname: Volm
mesh_terms: D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy*; D002945:Cisplatin / Q000627:therapeutic use; D003609:Dactinomycin / Q000627:therapeutic use; D004351:Drug Resistance; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy*; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D013997:Time Factors; D014183:Transplantation, Heterologous; D014750:Vincristine / Q000627:therapeutic use
chemical_list: D003609:Dactinomycin; D014750:Vincristine; D002945:Cisplatin