HMM: Study: Common cold strain may fight off bladder cancer. “A week prior to having surgeries to remove their tumors, the patients took CVA21 infusions through a catheter into their bladder. After the surgeries, the researchers discovered the virus killed all cancerous cells and continued to replicate itself to combat any other signs of cancer. According to the National Institutes of Health, non-muscle invasive bladder cancer makes up 75 percent of all bladder cancers.”