I'm sorry that you had another increase. The good news is it was a small increase and the PSA is still very low, and together with your Decipher score, indicating that there is no reason to suspect metastasis.
You were right when you said that PSADT is meaningless and undefined for values below 0.1. You can't stretch the data farther than it will go.
The Koulikov study (below) defined a group they called "low detectable, unstable PSA" as having:
• PSA greater than 0.03 and less than 0.2 ng/ml
• Two subsequent increases in PSA, and/or
• PSA velocity of 0.05 ng/ml/yr or greater
They found that 63% of the men who exhibited that trend went on to have a full-blown recurrence (that is, reached 0.2) within the next 7 years. 37% did not have a recurrence.
As for adjuvant ADT, I think you can safely forgo it at your PSA level:
/pcnrv.blogspot.com/2018/01/when-can-adt-be-safely-avoided-with.htmlI have a question for you -- When Tewari took a frozen section and they found cancer there, did they note the Gleason grade?