How Accurate?
Asked to comment on the app, Richard Bleicher, MD, leader of the Breast Cancer Program at Fox Chase Cancer Center, Philadelphia, praised the effort and the goal but had some concerns.
“Several questions arise, most important of which is, How accurate is this, and how has this been validated, if at all ― especially as it is too soon to see the outcomes of patients affected in this pandemic?” he told Medscape Medical News.
“We are imposing delays on a broad scale because of the coronavirus, and we are getting continuously changing data as we test more patients. But both situations are novel and may not be accurately represented by the data being pulled, because the datasets use patients from a few years ago, and confounders in these datasets may not apply to this situation,” Bleicher continued.
Although acknowledging the “value in delineating the risk of dying from cancer vs the risk of dying from the SARS-CoV-2 pandemic,” Bleicher urged caution in using the tool to make individual patient decisions.
“We need to remember that the best of modeling ... can be wildly inaccurate and needs to be validated using patients having the circumstances in question. ... This won’t be possible until long after the pandemic is completed, and so the model’s accuracy remains unknown.”
That sentiment was echoed by Giampaolo Bianchini, MD, head of the Breast Cancer Group, Department of Medical Oncology, Ospedale San Raffaele, in Milan, Italy.
“Arbitrarily postponing and modifying treatment strategies including surgery, radiation therapy, and medical therapy without properly balancing the risk/benefit ratio may lead to significantly worse cancer-related outcomes, which largely exceed the actual risks for COVID,” he wrote in an email.
“The OncCOVID app is a remarkable attempt to fill the gap between perception and estimation,” he said. The app provides side by side the COVID-19 risk estimation and the consequences of arbitrary deviation from the standard of care, observed Bianchini.
However, he pointed out weaknesses, including the fact that the “data generated in literature are not always of high quality and do not take into consideration relevant characteristics of the disease and treatment benefit. It should for sure be used, but then also interpreted with caution.”
Another Italian group responded more positively.
“In our opinion, it could be a useful tool for clinicians,” wrote colleagues Alessio Cortelinni and Giampiero Porzio, both medical oncologists at San Salvatore Hospital and the University of L’Aquila, in Italy. “This Web app might assist clinicians in balancing the risk/benefit ratio of being treated and/or access to the outpatient cancer center for each kind of patient (both early and advanced stages), in order to make a more tailored counseling,” they wrote in an email. “Importantly, the Web app might help those clinicians who work ‘alone,’ in peripheral centers, without resources, colleagues, and multidisciplinary tumor boards on whom they can rely.”
Bleicher, who was involved in the COVID-19 Breast Cancer Consortium’s recommendations for prioritizing breast cancer treatment, summarized that the app “may end up being close or accurate, but we won’t know except in hindsight.”
This article first appeared on Medscape.com.
