Via Dr. Broer in this interview:

This information I'm about to give you right now is extremely controversial and a bunch of people have exited the planet who were working with it.

This information has been around for awhile. They knew the information they were working with and they were basically being very, very careful, supposedly and some of them were being accused of using GcMAF, and the Food and Drug Administration apparently raided several of their offices several weeks before they committed suicide or suddenly died.

…It's going to sound complicated, but I'm going to break this down for everybody super, super easy tonight. When you first hear these terms they're going to sound weird to you…

GC protein is a protein in the body that is used by macrophages in the body. What it does is, macrophages in the body are the ones that kill cancer cells, they stop cytokines storms and can be involved in cytokines storms, we'll explain all these terms in a few minutes.

…Macrophages in the body are the ones that kill cancer cells. They stop cytokine storms… the GC protein in the body adds vitamin D to it… How many times have I told the listeners you have to take vitamin D every day?That's super important. Remember GC protein gets vitamin D added to it and the GC protein becomes what's called GcMAF (Gc protein-derived macrophage activating factor)… This GcMAF protein is human immune system enzyme protein also known as vitamin d binding protein…

This GcMAF is probably the single most effective thing in the immune system to kill cancer cells

…and what's happening is, the immune system is being compromised by a product called nagalase.

https://www.sott.net/article/312619-Dead-doctors-nagalase-and-vaccines-Whats-the-connection