The U.S. does very little research into what causes any kind of cancer. The VA has a presumptive list of substances assumed to be carcinogens and thus making veterans exposed to them eligible for cancer treatment benefits. An MPN group has been trying to get Agent Orange and napalm on the presumptive list for MPNs. I grew up near the factory where both were manufactured. Dad and I got ET. Mom and brother were fine.

An MPN specialist explained to me years ago that pinpointing the cause of cancers is very difficult because:

-Carcinogens usually take months or years to cause symptomatic cancers. It's almost impossible to know what you were exposed to at any given time that might have set it off.

-Some people have more predisposition to cancer than others. We all know that one person who smoked all his life, died at 90, and never got cancer. And we know people with similar smoking habits who got cancer and died at 55.

-Industries spend lots of $$ lobbying lawmakers not to investigate and regulate suspected carcinogens. Breast Cancer Alliance has had some success getting farmers not to use waste water from fracking (which contains suspected carcinogens), to irrigate crops. But consumer groups often have far less clout than industries.

-Cancer studies in animals are not always good predictors of what will cause cancers.

If doctors notice a significant increase in MPNs in patients post-covid vax, it warrants further study. But previous research indicates that the mutation lies dormant in most of us for years, even decades, before becoming symptomatic.