U.K. Monitoring Project
Not all studies, however, have found that COVID-19 infection is significantly more severe in children with cancer. In a 2020 report from the U.K. Paediatric Coronavirus Cancer Monitoring Project, researchers evaluated all children in the United Kingdom under the age of 16 diagnosed with COVID and cancer.
“[Given that] we had complete coverage of every center in the U.K. that cares for children with cancer, we are confident that we picked up at least all the severe or critical cases,” lead author Gerard Millen, MD, honorary clinical research fellow, University of Birmingham (England), said in an interview.
Between March 2020 and July 2020, Dr. Millen and colleagues identified 54 positive cases of COVID-19, 15 (28%) of which were asymptomatic, 34 (63%) mild, and 4 (7.4%) severe or critical – more in line with the incidence of severe illness reported in the general pediatric population.
“Thankfully, we had no children with cancer in the U.K. who died from COVID-19,” Dr. Millen noted. “Overall, in the U.K., we have taken the approach that the majority of children with cancer in this country are at very low risk from COVID-19 and that we do not have good evidence to modify their treatment.”
Dr. Millen pointed out that the data in the U.K. study were “remarkably similar” to those from the high-income countries in the global St. Jude/SIOP cohort, where 7.4% of patients in that cohort had severe or critical disease, compared with 7.4% of patients from their own U.K. cohort.
“I think many of the key differences between the two cohorts reflect the fact that access to treatment in many low- to middle-income countries is more challenging with many factors contributing to overall poorer outcomes for both cancer and noncancer metrics,” Dr. Millen said.
Both the U.K. and registry studies were performed prior to vaccinations becoming available to older children, and before the emergence of certain variants, including the Delta variant, which is responsible for the most recent surge of COVID-19 infections around the world.
Data on COVID-19 vaccination in children with cancer are limited but promising so far.
As for whether the Delta variant might affect outcomes for children with cancer and COVID-19, Dr. Mukkada could only speculate, but she noted that “what we are hearing anecdotally about the [Delta] disease being more severe, even in patients who don’t have cancer, is leading us to say that we can’t close the registry yet. We are still actively enrolling children.”
The study was funded by the American Lebanese Syrian Associated Charities and the National Cancer Institute. The study authors and Dr. Millen disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.