Hundreds? ITYM “…have always been around.” The ancient egyptians described cancer as a disease:
The earliest known descriptions of cancer appear in several papyri from Ancient Egypt. The Edwin Smith Papyrus was written around 1600 BC (possibly a fragmentary copy of a text from 2500 BC) and contains a description of cancer, as well as a procedure to remove breast tumours by cauterization, wryly stating that the disease has no treatment.
There is no reason to think cancers of different kinds have not been around for, like almost always, from long before humans developed to describe it.