Can a 4Kscore test be a vaild progression check during AS?

As the title reads, during AS, in lieu of a yearly biopsy, can a 4Kscore be used for indicating cancer progression (=> G7). Other than the mystery of knowing the actual G7, 8 or 9 score/pattern. By the design of the blood test, you would know if its "more" than a G6 condition, a signal to exit AS and have aggressive treatment (biopsy or not).

I'm probably missing something, almost to simple.
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OCTOBER 2015
Age: 59
PSA: 3.0 elevated to 3.5 in (6) months
3T-MRI: (1) lesion identified
Fusion Biopsy Results: Lesion cores benign, additional (12) cores = (1)5%
Pathology Summary: Grade Group 1 (GS6:3+3), 2nd pathology verification
Clinical Stage: T1c

Genetic DNA Profile: Above average risk for Aggressive PC
Existing Cancer DNA Profile: DNA risk unknown (Oncotype DX test cannot be performed, <1mm)
High Grade Biological Score: 27% aggressive risk (Mi-Prostate Score)
Other Health Conditions: Diabetes Type II (DX 2000), on meds & insulin

PCa Treatment: "Active Surveillance"
Risk: Undetected Cancer Progression
Risk Likelihood: LOW

My Story: https://www.healingwell.com/community/default.aspx?f=35&m=3528051

Post Edited (NewDay) : 2/26/2016 5:48:25 PM (GMT-7)

Thanks Allen,

I remember by uro saying biopsies are the Gold Standard.

Wishful thinking, the pin cushion lives on.

I just had my 1st 4k score this week. My psa has been as high as 12.5 and is currently 7.15 and climbing, and my free psa had me in about the 25% risk area. My uro said the next step was a 60 core biopsy.
This 4k test says - the probability of NOT developing distant metastasis within the next 10 years is 99.8%.
Its not over for me just yet, but this is good info to have.

Post Edited (tommyc) : 4/25/2017 11:19:38 AM (GMT-6)