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" ... The patients in the study received CVA21, a strain of coxsackievirus directly into their bladders via catheter one week before surgery. When the researchers examined tissue samples post-surgery, they found that the virus only infected cancerous cells, leaving healthy tissues alone. Not only that, urine samples from the patients indicated that the virus continued to replicate and attack more cancerous cells. In one patient, they found no trace of the cancer at all during the surgery, just one week after the patient received the therapy. ... "