Um....you're kidding right? I guess not. Cancer cells have nothing to do with silica coating. They are normal cells whose DNA is damaged and irreversible due to chemicals, radiation or otherwise. RNA cannot repair the damage and every time the cell divides, the damage is carried with it. To treat the cancer, you have to kill the cancer cells while minimizing the damage to the normal cells surrounding the tumor mass. Silica doesn't make up cell membranes. Proteins do. http://cellbio.utmb.edu/cellbio/membrane_intro.htm#Architecture So what that silica is in the ground? So what if bacteria live in dirt containing silica? The reason certain strains are so robust is their structure. Bacteria and viruses have been known to even survive the vacuum and radiation of space....no silica required.