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A newly developed in vitro chemosensitivity test (nuclear damage assay): application to ovarian cancer
1Department of Obstetrics and Gynecology, Chiba University School of Medicine, Japan.
Abstract:
With a newly developed in vitro chemosensitivity test based on the morphological changes of nuclear damage (nuclear damage assay) described here, we were able to screen currently available anticancer drugs within 24 hr with a 100% success rate. In preclinical chemotherapy using four human ovarian epithelial tumor cell lines and their xenografts in nude mice, the in vitro/in vivo response (sensitive/sensitive and resistant/resistant) rate was 94%. The nuclear damage assay was used to determine the chemosensitivity in 49 patients (60 assays) with ovarian cancer. The response rate of the 13 patients with measurable tumors, 9 of whom showed resistance to CAP (cyclophosphamide, adriamycin, and cisplatin) therapy, was 46% when the patients were given various combination chemotherapy protocols consisting of more than one active agent selected from group A and B agents by the nuclear damage assay. The newly developed in vitro chemosensitivity test proved to be useful when selecting a second-line combination chemotherapy for patients with CAP-resistant ovarian cancer.
Insights
A novel nuclear damage assay rapidly screens anticancer drugs with 100% accuracy. This in vitro test accurately predicts patient response to chemotherapy, aiding treatment selection for ovarian cancer.
Area of Science:
- Oncology
- Pharmacology
- Biotechnology
Background:
- Ovarian cancer presents significant treatment challenges, often necessitating personalized chemotherapy approaches.
- Predicting individual patient response to chemotherapy remains a critical unmet need in clinical oncology.
Purpose of the Study:
- To introduce and validate a novel in vitro chemosensitivity test, the nuclear damage assay.
- To assess the efficacy of the nuclear damage assay in predicting anticancer drug response in ovarian cancer models and patients.
Main Methods:
- Development of an in vitro nuclear damage assay to evaluate drug-induced morphological changes.
- Preclinical evaluation using human ovarian cancer cell lines and xenografts in nude mice.
- Clinical application in 49 ovarian cancer patients to determine chemosensitivity and guide treatment selection.
Main Results:
- The nuclear damage assay achieved 100% success in screening available anticancer drugs within 24 hours.
- A 94% in vitro/in vivo response concordance was observed in preclinical models.
- In 13 ovarian cancer patients with measurable tumors, a 46% response rate was achieved with chemotherapy selected by the assay, particularly for CAP-resistant cases.
Conclusions:
- The nuclear damage assay is a rapid and accurate method for assessing anticancer drug efficacy.
- This assay demonstrates significant utility in guiding the selection of effective second-line combination chemotherapy for CAP-resistant ovarian cancer patients.