by Will Jones, Daily Sceptic:

mRNA vaccines aid cancer development due to the use of modified mRNA designed to suppress immunity, a study in the International Journal of Biological Macromolecules has found. The abstract summarises the findings (with my emphasis):

Due to the health emergency created by SARS-CoV-2, the virus that causes the COVID-19 disease, the rapid implementation of a new vaccine technology was necessary. mRNA vaccines, being one of the cutting-edge new technologies, attracted significant interest and offered a lot of hope.