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Cancer patients on chemotherapy likely not fully protected by COVID-19 vaccine, study finds

Hina ZahidWritten by Hina Zahid Published On 2021-10-11T09:00:02+05:30  |  Updated On 2021-10-11T09:00:24+05:30
Cancer patients on chemotherapy likely not fully protected by COVID-19 vaccine, study finds
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The COVID-19 pandemic has been an especially stressful time for cancer patients undergoing chemotherapy, which attacks not only the cancer, but also the immune cells needed to defend the body from infections. New research at the University of Arizona Health Sciences found that patients undergoing active chemotherapy had a lower immune response to two doses of the COVID-19 vaccine, but a...

The COVID-19 pandemic has been an especially stressful time for cancer patients undergoing chemotherapy, which attacks not only the cancer, but also the immune cells needed to defend the body from infections. New research at the University of Arizona Health Sciences found that patients undergoing active chemotherapy had a lower immune response to two doses of the COVID-19 vaccine, but a third dose increased response.

"We wanted to make sure we understand the level of protection the COVID-19 vaccines are offering our cancer patients, especially as restrictions were being eased and more contagious variants were starting to spread," said Rachna Shroff, MD, MS, chief of Gastrointestinal Medical Oncology at the UArizona Cancer Center and director of the Cancer Center Clinical Trials Office.

To answer this question, Dr. Shroff and a team of UArizona Health Sciences researchers looked at 53 Cancer Center patients on immunosuppressive active cancer therapy, such as chemotherapy. They compared the immune response following the first and second dose of the Pfizer-BioNTech COVID-19 vaccine with that of 50 healthy adults. Their results were published online in the journal Nature Medicine.

After two vaccine doses, most of the cancer patients showed some immune response to the vaccine, meaning they had antibodies for SARS-CoV-2, the virus that causes COVID-19.

"We were pleasantly surprised," said Deepta Bhattacharya, PhD, professor of immunobiology in the College of Medicine – Tucson and a member of the Cancer Center and BIO5 Institute. "We looked at antibodies, B cells and T cells, which make up the body's defense system, and found the vaccine is likely to be at least partially protective for most people on chemotherapy."

However, the immune response was much lower than in healthy adults, and a few of the patients had no response to the COVID-19 vaccine. This translates to less protection against SARS-CoV-2, especially the delta variant that is now the dominant strain in the United States.

Twenty patients returned for a third shot, which boosted the immune response for most. The overall group immune response after the third shot reached levels similar to those of people who were not on chemotherapy after two doses.

The interdisciplinary research team was formed not long after the Pfizer-BioNTech vaccine was approved in late 2020. To get the clearest answer possible, they focused on patients with solid tumors, such as breast or gastrointestinal cancer, and excluded people on immunotherapy.

"The fact that we could answer this question in such a short time speaks to what can happen when you leverage the varied expertise we have within UArizona Health Sciences," said Dr. Shroff, who also is a member of the BIO5 Institute. "Cancer Center clinicians went above and beyond to enroll their patients in the study because we all had a unified goal to protect our patients."

Coauthors include: Pavani Chalasani, MD, MPH, associate professor of medicine in the Cancer Center; Bonnie LaFleur, biostatistics research professor in the BIO5 Institute; Michael D. Dake, MD, senior vice president of UArizona Health Sciences; Aaron J. Scott, MD, associate professor of medicine; Janko Nikolich-Žugich, MD, PhD, head of the Department of Immunobiology; Michael Worobey, DPhil, head of the Department of Ecology and Evolutionary Biology; Ryan Sprissler, PhD, manager of the University of Arizona Genetics Core; research assistant professor Mladen Jergovic, PhD; associate research scientist Jennifer L Uhrlaub; postdoctoral researcher Marta V. Schoenle, PhD; graduate students Grace Quirk and Tyler J. Ripperger; research assistant Shelby Dalgai; research specialist Alexander Wolf; clinical research coordinator Hytham Hammad; Cancer Center program manager Daniel Pennington; research nurse Amy Carrier, RN; and research technician Ran Wei.

https://www.nature.com/articles/s41591-021-01542-z

chemotherapy covid 19 vaccine nature medicine 
Hina Zahid
Hina Zahid

    Hina Zahid Joined Medical Dialogue in 2017 with a passion to work as a Reporter. She coordinates with various national and international journals and association and covers all the stories related to Medical guidelines, Medical Journals, rare medical surgeries as well as all the updates in the medical field. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

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