Dr. Ankit Bharat's research team is pictured at the Northwestern Medicine lab. The newly created immune cells were able to move into the blood vessels and tumors — something typical immune cells cannot do. Advertisement AdvertisementBreast Cancer Vaccine Update From Cleveland Clinic: ‘A New Era'This effect was activated by severe COVID-19, the researchers found, and was specifically seen to be effective against melanoma, lung cancer, breast cancer and colon cancer. "Normally, the immune system can tell there's something wrong with cancerous tissue, but cancers develop various mutations to hold the immune system back from attacking them," Glanville went on. Original article source: COVID-19 virus could attack cancer cells and shrink tumors, new study suggests