Increased sensitivity to platinum drugs of cancer cells with acquired resistance to trabectedin

B. Colmegna, S. Uboldi, R. Frapolli, S. A. Licandro, N. Panini, C. M. Galmarini, Nadia Badri, V. J. Spanswick, J. P. Bingham, Konstantinos Kiakos, E. Erba, J. A. Hartley, M. D'Incalci

Research output: Contribution to journalArticlepeer-review


Background:In order to investigate the mechanisms of acquired resistance to trabectedin, trabectedin-resistant human myxoid liposarcoma (402-91/T) and ovarian carcinoma (A2780/T) cell lines were derived and characterised in vitro and in vivo.Methods:Resistant cell lines were obtained by repeated exposures to trabectedin. Characterisation was performed by evaluating drug sensitivity, cell cycle perturbations, DNA damage and DNA repair protein expression. In vivo experiments were performed on A2780 and A2780/T xenografts.Results:402-91/T and A2780/T cells were six-fold resistant to trabectedin compared with parental cells. Resistant cells were found to be hypersensitive to UV light and did not express specific proteins involved in the nucleotide excision repair (NER) pathway: XPF and ERCC1 in 402-91/T and XPG in A2780/T. NER deficiency in trabectedin-resistant cells was associated with the absence of a G2/M arrest induced by trabectedin and with enhanced sensitivity (two-fold) to platinum drugs. In A2780/T, this collateral sensitivity, confirmed in vivo, was associated with an increased formation of DNA interstrand crosslinks.Conclusions:Our finding that resistance to trabectedin is associated with the loss of NER function, with a consequent increased sensitivity to platinum drugs, provides the rational for sequential use of these drugs in patients who have acquired resistance to trabectedin.

Original languageEnglish
Pages (from-to)1687-1693
Number of pages7
JournalBritish Journal of Cancer
Issue number12
Publication statusPublished - Dec 22 2015


  • cis-DDP
  • collateral sensitivity
  • DNA repair
  • ovarian cancer
  • resistance
  • Trabectedin

ASJC Scopus subject areas

  • Cancer Research
  • Oncology


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