My initial PSA check in Nov last year came back as 83.2 and following an MRI, bone scans & a biopsy, I've been diagnosed with Metastatic Prostate cancer. I'm due to meet my Oncologist shortly to discuss chemotherapy after having been on Zoladex jabs for around 7 weeks. My pre meeting blood test has shown my PSA has dropped to 0.85. Is this unusual in such a short space of time?