Low testosterone, rising PSA

[Alinur]

Hi everyone, I think my ADT holiday I s getting short.I had SBRT on spot found in the iliac bone and than 18 months of ADT( no Zytiga yet).stopped ADT and only almost 4 months my PSA is rising ( 0.038) from <0.006 on May.The problem is that the Testosterone is less than 50. Castration resistance?

I have 2 options to think about:

1) to wait untill PSA reaches around 0.7 or more and than another PSMAPETC as I did before.

2)ADT+ Zytiga immediately and see what happens.

Your opinions?

Thank you all.