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• W1994697003 abstract "Proliferation of tumor cells during radiotherapy may limit tumor control, especially in rapidly proliferating tumors such as head and neck carcinomas. We present a flow cytometric method for detection of PCNA in solid head and neck tumors and how these data correlate with outcome.Pretherapeutic biopsies of 20 inoperable patients with Stage IV squamous cell carcinoma were examined. Biparametric flow cytometry was done after anti-PCNA (PC10) and propidium iodine staining were performed. PCNA index (percentage PCNA positive cells), DNA index, and S phase fraction (SPF, euploid tumors only) were determined. The therapy consisted of an accelerated-hyperfractionated radiochemotherapy (66 Gy/5 weeks, concomitant boost of 1.6 Gy/day in weeks 4+5, Carboplatin 5 x 70 mg/m2 in weeks 1+5). The median follow-up time was 30 months.Fourteen patients suffered from disease progession and 12 died. Median actuarial, cause-specific survival, and disease-free survival (DFS) times were 17 and 9 months, respectively. PCNA indices ranged from 4 to 70% (median 9%); there were 7 aneuploid and 13 euploid tumors. SPF ranged from 4 to 14.5% (median 10.5%). Neither SPF nor ploidy had a significant influence on outcome. Patients were divided according to PCNA index in higher (n = 10) and lower (n = 10) than the median. Survival and DFS were 13 and 6 months for the group >9% and 20 and 15 months for the group <9%. The difference in DFS was significant (p = 0.03, log rank test).These results fall in line with other studies showing the influence of pretherapeutic proliferation on outcome after radiotherapy. Although the moderately accelerated therapy regimen certainly reduces the influence of proliferation on outcome, patients with faster proliferating tumors still have a worse outcome. DFS is the more relevant endpoint in this study because of effective salvage therapies, which influence survival." @default.
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• W1994697003 date "1997-03-01" @default.
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• W1994697003 title "Predictive value of the flow cytometric PCNA assay (proliferating cell nuclear antigen) in head and neck tumors after accelerated-hyperfractionated radiochemotherapy" @default.
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• W1994697003 doi "https://doi.org/10.1016/s0360-3016(97)00024-2" @default.
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