Covid vaccines may come with a tantalizing benefit that has nothing to do with the virus they’re designed to protect against: boosting the immune system to better fight tumors during cancer treatment. That’s according to new results presented Sunday in Berlin at the European Society for Medical Oncology conference. The research is still in the earlier stages — it has yet to be tested in a Phase 3 clinical trial — but experts say it shows promise. “I am cautiously optimistic,” s

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