Will Falconer, DVM Moderator
Hi Claudia,
Tumors are most definitely caused by vaccination, some of them more obvious than others. The ones at the site of vaccination are often fibrosarcomas, and even conventional medicine recognizes cause and effect.
They may have changed the name, but for many years, cats were diagnosed with VAS: Vaccine Associated Sarcoma. And they were largely, if not all, malignant and quite incurable.