AgNORs as an early marker of sensitivity to radiotherapy in gynecologic cancer |
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Authors: | Heber Elisa Schwint Amanda E Sartor Beatriz Nishihama Susana Sánchez Osvaldo Brosto Miguel Itoiz María Elina |
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Affiliation: | Department of Radiobiology, National Atomic Energy Commission, Avenida del Libertador 8250 (1429), Buenos Aires, Argentina. |
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Abstract: | OBJECTIVE: To evaluate the changes induced in silver-stained nucleolar organizer regions (AgNORs) by the first fraction of a radiotherapy protocol for gynecologic cancer on exfoliated cytologic samples to predict the therapeutic success of the full protocol. STUDY DESIGN: Thirteen gynecologic cancer patients who were scheduled for radiotherapy were included in the study. Cell smears were taken from the affected area before and after the first fraction of a radiotherapy protocol and silver stained for AgNORs. AgNORs per nucleus were counted under a light microscope. Local disease control by the full radiotherapy protocol was assessed at one year by the Papanicolaou technique. RESULTS: Local success of radiotherapy was greater for lesions with higher pretreatment AgNOR counts and for lesions that underwent a greater percentage reduction in AgNOR counts after the first fraction. We correlated local success of the full radiotherapy protocol with a predictive index based on AgNOR counts obtained before and after the first fraction. CONCLUSION: A predictive index based on AgNOR counts can predict, as early as after the first fraction, the local control of disease by a full radiotherapy protocol. Knowledge of the probability of success long before the protocol is completed would allow reevaluation of therapeutic options. |
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