Head-to-head comparison of tyrosine kinase inhibitors in renal cell carcinoma using patient-derived cell culture.

BACKGROUND

Metastatic renal cell carcinoma (RCC) is often treated with a combination of immunotherapy and tyrosine kinase inhibitors (TKIs). Patient-derived RCC cells were cultured and inter-individual differences to treatment with a panel of TKIs were evaluated.

METHODS

Tumor tissue was collected during nephrectomy. Cells were cultured and treated with a panel of clinically relevant TKIs (sunitinib, cabozantinib, pazopanib, axitinib) at concentrations of 5 µM for 48-72 hours. Cell viability was evaluated using MTT assays. One-sided T-tests were used to evaluate results.

RESULTS

Patient-derived cancer cells were able to be grown beyond 10 passages from 12/38 samples collected (27%). Four patient-derived samples were tested against the TKI panel. No substantial difference between drugs was seen for two samples. In one sample, there was a clear superior response to sunitinib (48% mean viability, vs >75% for the other drugs). For the final sample, sunitinib, cabozantinib, and axitinib demonstrated a superior response compared with pazopanib (71%, 77%, 70%, and 85% mean viability, respectively).

CONCLUSIONS

Inter-individual variability in the responses of patient-derived RCC cultures to TKIs was seen, which may have biological and clinical significance. Future directions could build on this work to develop personalized cancer susceptibility profiles, with potential for translation into a clinical trial.