PURPOSE: Is retention of gammaH2AX foci useful as a biomarker for predicting the response of xenograft tumors to cisplatin with X-ray? Is a similar approach feasible using biopsies from patients with cervical cancer? EXPERIMENTAL DESIGN: Mice bearing SiHa, WiDr, or HCT116 xenograft tumors were exposed to cisplatin and/or three daily doses of 2 Gy. Tumors were excised 24 h after treatment and single cells were analyzed for clonogenic fraction and retention of gammaH2AX foci. Tumor biopsies were examined using 47 paraffin-embedded sections from untreated tumors and 24 sections from 8 patients undergoing radiochemotherapy for advanced cancer of the cervix. RESULTS: Residual gammaH2AX measured 24 h after cisplatin injection accurately predicted surviving fraction in SiHa and WiDr xenografts. When a clinically equivalent protocol using cisplatin and fractionated irradiation was employed, the fraction of xenograft cells lacking gammaH2AX ranked survival accurately but underestimated tumor cell kill. Residual gammaH2AX foci were detected in clinical samples; on average, only 25% of tumor nuclei exhibited one or more gammaH2AX foci before treatment and 74% after the start of treatment. CONCLUSION: gammaH2AX can provide useful information on the response of human tumors to the combination of cisplatin and radiation, but prediction becomes less accurate as more time elapses between treatment and tumor biopsy. Use of residual gammaH2AX as a biomarker for response is feasible when cell survival exceeds approximately 20%, but heterogeneity in endogenous and treatment-induced gammaH2AX must be considered.
PURPOSE: Is retention of gammaH2AX foci useful as a biomarker for predicting the response of xenograft tumors to cisplatin with X-ray? Is a similar approach feasible using biopsies from patients with cervical cancer? EXPERIMENTAL DESIGN:Mice bearing SiHa, WiDr, or HCT116 xenograft tumors were exposed to cisplatin and/or three daily doses of 2 Gy. Tumors were excised 24 h after treatment and single cells were analyzed for clonogenic fraction and retention of gammaH2AX foci. Tumor biopsies were examined using 47 paraffin-embedded sections from untreated tumors and 24 sections from 8 patients undergoing radiochemotherapy for advanced cancer of the cervix. RESULTS: Residual gammaH2AX measured 24 h after cisplatin injection accurately predicted surviving fraction in SiHa and WiDr xenografts. When a clinically equivalent protocol using cisplatin and fractionated irradiation was employed, the fraction of xenograft cells lacking gammaH2AX ranked survival accurately but underestimated tumor cell kill. Residual gammaH2AX foci were detected in clinical samples; on average, only 25% of tumor nuclei exhibited one or more gammaH2AX foci before treatment and 74% after the start of treatment. CONCLUSION:gammaH2AX can provide useful information on the response of humantumors to the combination of cisplatin and radiation, but prediction becomes less accurate as more time elapses between treatment and tumor biopsy. Use of residual gammaH2AX as a biomarker for response is feasible when cell survival exceeds approximately 20%, but heterogeneity in endogenous and treatment-induced gammaH2AX must be considered.
Authors: Robert J Kinders; Melinda Hollingshead; Scott Lawrence; Jiuping Ji; Brian Tabb; William M Bonner; Yves Pommier; Larry Rubinstein; Yvonne A Evrard; Ralph E Parchment; Joseph Tomaszewski; James H Doroshow Journal: Clin Cancer Res Date: 2010-10-05 Impact factor: 12.531
Authors: Moritz Birkelbach; Natalie Ferraiolo; Liliana Gheorghiu; Heike N Pfäffle; Benedict Daly; Michael I Ebright; Cheryl Spencer; Carl O'Hara; Johnathan R Whetstine; Cyril H Benes; Lecia V Sequist; Lee Zou; Jochen Dahm-Daphi; Lisa A Kachnic; Henning Willers Journal: J Thorac Oncol Date: 2013-03 Impact factor: 15.609
Authors: Bart Cornelissen; Veerle Kersemans; Sonali Darbar; James Thompson; Ketan Shah; Kate Sleeth; Mark A Hill; Katherine A Vallis Journal: Cancer Res Date: 2011-05-17 Impact factor: 12.701