Hi - charm I belive that scc is hypoxic. they have been doing studies. The more hypoxic the tumor, the more radio resistant it is. if it's highly hypoxic, then it spreads faster and grows faster as it doesn't respond that well. I do think maybe because certain types of SCC seem far more responsive as - i think brian points out - BOT seems to respond well. Perhaps maybe because it is virus related it is less hypoxic? not sure. just a theory.
A solid tumor is a collection of cells that form a solid mass, liquid tumors are blood born cancers like leukemia etc... I just completely simplified that but I imagine you get what im saying. This is all very exciting!