cancer is the result of an inefficient immune system: either too weak overall, or overreactive due to low intelligence of the immune system. maybe the parasite burden is too high for or the parasite is unfamiliar to the immune system. the complete immune system encompases filtration & excretion mechanisms (liver, kidney, lymphatics, lungs, sneezing, etc.)

some cancer is a result of tissue's reaction against a real parasite. the body attempts to wall it off, but then goes into overdrive, and/or the parasite keep proliferating, exploring, and excreting toxins.

parasites are notoriously difficult to detect, unless u see one hanging out of the butt or coming out of the mouth, or the blood serum lab test demonstrates a sudden spike in eosinophils. occasionally some classic parasitic markers also show up.

some parasites are so small and difficult to detect, that ur only chances are to

A) empirically treat with an anti-parasitic and if patient improves - possibly was a parasite. B) biopsy the cancerous lesion, section it in layers, then use AI-enhanced software in a high-resolution pathology lab to reconstruct a model of the tissue and try to find something that looks like a parasite that u have sliced up. C) hope the parasitic burden is high enough to detect by lab test.