Dogs detect diabetes and epilepsy and cancer of several varieties. They have for years. Some are trained to detect disease, others are just paying attention to their human family members. But humans cannot rely on dogs alone. As it turns out, ants can smell cancer, too. The way we diagnose cancer today — by drawing blood, taking biopsies and conducting colonoscopies — is often expensive and invasive. Animal behaviorists are imagining a world in which doctors one day tap species with keen senses to help spot tumors quickly and cheaply.
Dogs can sniff out the presence of cancer in body odor, past research has shown. Mice, nematodes and even fruit flies react to cancer cells. But ants, may have the edge over dogs and other animals that are time-consuming to train.
https://www.washingtonpost.com/climate-environment/2023/01/24/ants-smell-cancer