While the initial protocol had much more frequent blood draws, clinic visits, imaging, and higher radiation doses compared to the current protocol, particularly after the 2-year time point, the consequences of that reduction have never before been analyzed.
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Overall, they identified 710 patients with seminoma and 552 patients with non-seminoma patients who underwent AS, with median follow-up of 6.76 and 5.21 years, respectively. During that time frame, the number of computed tomography (CT) scans decreased from 11 to five (non-seminoma patients) and from 20 to 10 (seminoma), while chest X-rays decreased from 27 to 0 (non-seminoma) and from 13 to 4 (seminoma).
In terms of cancer outcomes, the relapse rate decreased over time, with no increase in stage or treatment burden at relapse. This was likely due to improved patient selection for AS patients, due to better staging studies. For seminoma, there appeared to be a decrease in N, M, and S stages at the time of relapse. For patients on the most recent protocols, of the patients with relapse, 100% of seminoma and 82.6% of non-seminoma patients were cured with monotherapy only.
Overall, this study reaffirms that a more limited protocol based on better understanding of disease progression has not sacrificed oncologic care, but has reduced patient burden. Patients that did relapse on the new protocols were able to be salvaged safely.
Presented By: Matthew Da Silva, BMSc, Faculty of Medicine, University of Toronto, Toronto, Ontario
Co-Authors: Michael A. Jewett, Padraig Warde, Eshetu Atenafu, Lynn Anson-Cartwright, Aaron Hansen, Peter Chung, Philippe Bedard, Joan Sweet, Martin O'Malley, Robert J. Hamilton
Institution: University of Toronto
Written By: Thenappan Chandrasekar, MD, Clinical Fellow, University of Toronto Twitter: @tchandra_uromd at the 72nd Canadian Urological Association Annual Meeting - June 24 - 27, 2017 - Toronto, Ontario, Canada