Diagnosed with PC in October last year following TURPS, had catheter prior to that for three years. MRI showed no new lesions, was offered biopsy but went on AS. Had first PSA in March and this has increased from 0.74 in October to 3.8 in March which seems quite a spike in 5 months,waiting on urine sample results, if negative, repeat PSA in 6 weeks. I have decided to request a biopsy, am I right to be concerned about spike?