Hi, I thought one of your photos looked familiar. I had seen one like it before. This link says it's ascaris. About your sample being normal, I've learned on curezone that that is often the case, as they must see live worms to make a positive. There was a link on the parasite forum to a specialty test you can get if you want to know what type , but with those pics and your lowered immune system because of the cancer, you are probably ripe pickings for the ignorant little so and so's. I've also read quitting meat helps avoid the worms.