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PubMed · 11899765

Chemosensitivity testing.

Abstract

Determining which chemotherapy treatment to administer to a patient with cancer is challenging because each patient's cancer is unique. Hundreds of different forms of cancer exist, and tumors of the same type or classification can have very different responses to the same, often standard, treatment. A scientifically-based analysis of how the chemotherapy options for an individual patient may affect that patient's specific tumor could benefit both the clinician and the patient. Chemosensitivity testing can provide this information. A Chemosensitivity assay is a laboratory test that is performed by isolating the cancer cells from a tumor specimen, exposing the cells to the desired chemotherapy agents, and evaluating the effectiveness of those agents. The results provide patient-specific tumor information.

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R Letwin. Chemosensitivity testing.. https://pubmed.ncbi.nlm.nih.gov/11899765/

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Chemosensitivity of prostatic tumour cell lines under conditions of G2 block abrogation.

Conventional chemotherapy has had very limited success in the control of hormone-refractory prostate cancer. Methylxanthine derivatives, such as pentoxifylline (PTX), are known to abrogate the G2 block and enhance the toxicity of ionising irradiation and chemotherapeutic agents. It is now also established that late addition of the cytotoxic drug after irradiation under conditions of G2 block abrogation sensitises human tumour cells for cytotoxins. Here we assess whether the chemosensitivity of prostate tumour cell lines can be enhanced by the application of a low dose of drug in conjunction with a G2 block abrogator. Prostate cell lines DU145, BM1604 and LNCaP were irradiated with 7 Gy 60Co gamma-irradiation. A sub-toxic (2 mM) dose of pentoxifylline and a cytotoxic drug were added at maximum expression of the G2 cell cycle block and cell survival was determined by colony assay. Cisplatin, etoposide and vinblastine were tested at a toxic dose of 10% (TD10). In the TP53 mutant cell lines, DU145 and BM1604, dose enhancement factors (EFs) were found to be in the region of 4.20 for cisplatin, 3.70 for vinblastine, and 3.20 for etoposide. In the TP53 wild-type cell line, LNCaP, the enhancement factors were low and in the region of 1.20 for cisplatin, vinblastine and etoposide. It is clear, therefore, that toxicity enhancement factors (EFs) are greater in the TP53 mutant cell lines, DU145 and BM1604, than in the TP53 wild-type cell line, LNCaP. The results indicate that a significant enhancement of drug toxicity can be obtained if the cytotoxic drug is given under conditions of G2 block abrogation. The sensitisation of prostate cancer cells to cytotoxic drugs is particularly high in radiation-resistant TP53 mutant tumour cells. Drugs which abrogate G2 block have the potential to enhance the therapeutic index and therefore reduce the toxicity of chemotherapy drugs.

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