All scientific research is built on particular dogmas including, or perhaps especially, biomedicine. It’s easier for some “scientists” to perpetuate falsehoods than it is to admit they were wrong, abandon long standing ideas, and start again from scratch. Many scientists would rather pursue trendy research areas in order to win accolades and secure grant money than question long-held beliefs and dogmas.
This is exactly what has happened with modern medicine because too much money and too many reputations are at stake. If you’re not allowed to question it, then it’s not real science.