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Can covid vaccines cause cancer? In some cases, the answer appears to be yes. To be sure, there is no evidence that covid vaccines themselves are carcinogenic (i.e. cancer-causing). However, it has been shown that in up to 50% of vaccinees, covid vaccines can induce a temporary immune suppression or immune dysregulation (lymphocytopenia) that may last about a week or possibly longer. In addition, covid mRNA vaccines have been shown to “reprogram” (i.e. influence) adaptive and innate immune responses and, in particular, to downregulate the so-called TLR4 pathway, which is known to play an important role in the immune response to infections and cancer cells. Thus, if there already is a tumor somewhere – known or unknown –, or if there is a predisposition to some type of cancer, such a state of vaccine-induced immune suppression or immune dysregulation might potentially trigger sudden tumor growth and cancer in the weeks following vaccination. Of note, lymphocytopenia has also been frequently observed in cases of severe covid.”
Covid Vaccines and Cancer – Swiss Policy Research (swprs.org)