Hello, I’m 64, been followed faithfully every 6 months. 3 previous negative biopsies, PSA range of 3.2 up to 7.9. Most recent 6.8 triggered a MRI. They only found one lesion but it’s a pirad 4. My doctor says it’s a 50/50 chance of cancer. I’m really confused how bad this could be. Dr said it’s contained. Also worried previous biopsy’s could have missed the tumor. Please help!