Early trials of the drug VIR-5500 showed it shrinking tumours in some patients Early trials of the drug VIR-5500 showed it shrinking tumours in some patients A new drug for advanced prostate cancer has shown promise in early trials experts have said, with the medication shrinking tumours in some patients. Prostate cancer is the most common cancer among men in many countries, including the US and UK. About 1.5 million men are diagnosed worldwide each year . The new drug has caused excitement as