The potential of plantinum-DNA adduct determination in ex vivo treated tumor fragments for the prediction of sensitivity to cisplatin chemotherapy

Ann Oncol. 1999 Jan;10(1):97-103. doi: 10.1023/a:1008324803494.


Background: Response to cisplatin-therapy is assumed to be related to the formation of platinum (Pt)-DNA adducts. Measurement of these adducts prior to therapy could be of value to improve cisplatin based cancer therapy.

Materials and methods: We determined Pt-GG and Pt-AG adduct levels by use of 32P-postlabeling after ex vivo cisplatin treatment of fragments of head and neck squamous cell carcinoma (HNSCC) xenografts (five lines), and of tumor biopsies from patients with HNSCC (n = 8) and testicular cancer (n = 8).

Results: Adduct levels in fragments (3 x 3 x 3 mm) exposed to 10 to 80 microM cisplatin for one hour, showed positive correlations with the in vivo response to cisplatin treatment (P < 0.05), as well as with the xenograft adduct levels observed after in vivo cisplatin treatment (P < 0.02). After an additional five-hour drug-free incubation period the correlations were absent. When patient tumor fragments were exposed ex vivo to 80 microM cisplatin for one hour, adduct levels were similar in HNSCC and testicular cancer. Persistence of adducts was observed for testicular cancer in the additional drug-free period. The adduct levels in the samples of two HNSCC patients who received cisplatin chemotherapy were in line with the hypothesis that higher adduct levels are associated with a better response.

Conclusion: Our preliminary results show that analysis of DNA adducts following ex vivo drug treatment is a feasible approach towards a predictive assay, which warrants further investigation.

Publication types

  • Clinical Trial
  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Antineoplastic Agents / administration & dosage*
  • Carcinoma, Squamous Cell / drug therapy*
  • Cisplatin / administration & dosage*
  • Culture Techniques
  • DNA Adducts / analysis*
  • Drug Resistance, Neoplasm / genetics
  • Female
  • Head and Neck Neoplasms / drug therapy*
  • Humans
  • Male
  • Middle Aged
  • Predictive Value of Tests
  • Sensitivity and Specificity
  • Testicular Neoplasms / drug therapy*


  • Antineoplastic Agents
  • DNA Adducts
  • Cisplatin