Here’s a good overview of PSMA diagnostics by Dr. Calais, one of the UCLA doctors involved with getting 68Ga-PSMA-11 PET approved by the FDA. It’s a bit on the technical side, but it does show the strengths and limitations of the imaging technique.
Let the radioactive fun begin!
I was able to schedule my bone and CT scans this morning with considerable ease. In fact, things will happen much sooner than I thought they might. My CT scan is scheduled next Wednesday, 14 July, and my bone scan is scheduled Friday, 23 July.
I have to go for some pre-scan lab work tomorrow afternoon to ensure that my kidneys are working fine and won’t be damaged by one of the contrasts.
I haven’t given up on the Ga-68 PSMA PET scan. In fact, I wrote my health insurance company an email about 4:30 a.m. as I tossed and turned. (Last night was hell. If I slept more than 2 hours—non-consecutively—that was about it.) They tout having a response within 2 business days, so we’ll see if they come through with that.
UCLA is out of network for my insurance company, so I’d have to cough up 40% of the cost if they’re going to cover it at all. I’m okay with that. (For my overseas readers, welcome to U.S. health care systems!)
So that’s the latest and greatest. More to come, I’m sure.
This is a really interesting (at least to me) video out of the University of California San Francisco (UCSF). Remember that UCSF and UCLA were the two institutions that did considerable work to get the Ga-68 PSMA PET scan approved by the Food and Drug Administration in December 2020.
First, at the 3:04 minute mark in the video, he presents the number of positive scans by PSA level. Interestingly, he references the same study I posted earlier. What differs in this presentation from the other one I posted is that this looks at PSA values <0.2 and from 0.2-0.49, whereas the other study just looked at positive scans for PSA values <0.5. However, something seems off between the two.
In the original study, it showed a positive detection rate of about 38% for PSA values <0.5. In this video, however, the chart appears to show a positive detection rate at the <0.2 PSA level somewhere north of 40%, and a positive detection rate at the 0.2-0.49 PSA level somewhere north of 50%. Perhaps he wasn’t all that skilled at making bar charts in PowerPoint, but something is amiss.
Where I’m encouraged is that it appears that they are, in fact, able to detect cancer at my PSA level or even lower. The only question is, at what rate? I’ll stick with the one in three value for now, which is still better than zero.
I did email one of the doctors on the team at UCSF, and his response was:
There are no guarantees, but there is a chance that a PSMA PET could detect a site of recurrence with a PSA of greater than 0.2. The chance of detection usually increases as the PSA goes up.
Not exactly a ringing endorsement of his own product, but I think that’s more to couch expectations because this is so new and even he is still trying to figure it out. (I admit, I was surprised that he even responded, so I’m thankful for that.)
I’ve got a good list of questions ready for my appointment on Tuesday, and I’m sure I’ll spend some of this holiday weekend adding to it and refining it.
Stay tuned for more.
Wow. This could not be more applicable to my current circumstances and certainly gives me food for thought.
I came across this video highlighting Ga68 PSMA PET imaging from the doctor at the University of California San Francisco who helped with developing this imaging technique. It’s a bit long and a bit technical in some places, but gives a good overview.
This is great news for prostate cancer imaging. It’s something that I’ll look into should my PSA keep creeping upward.
Wow. I just may get this post out on time this month! I tell you, this pandemic thing has really thrown me for a loop when it comes to maintaining some sort of routine. Fortunately (or perhaps unfortunately), I’ve returned to working from the office every day for the last three weeks, and that’s brought some structure back to my life.
It’s hard to believe, but four months have passed since my last PSA test, and I’ll be heading off to the clinic on Tuesday morning. I hope. I haven’t actually confirmed that they’ve reopened for routine things like blood tests. If they are open and they do take the sample, I should have the results late Thursday night or Friday. My appointment to go over the results is on 2 July.
Just as a reminder, here’s my PSA roller coaster:
I’m at the point where I don’t get too worked up about these tests anymore, even with the upward trend. It is what it is and I’ll deal with the number when I get it.
Imaging Trial for Veterans in Los Angeles
The VA Greater Los Angeles Healthcare System is conducting a phase II trial “to determine whether a positron emission tomography (PET)/computed tomography (CT) scan using 18F-DCFPyL affects the clinical management plan in Veterans.” Some are saying that 18F-DCFPyL may prove to be even better than a Ga-68 scan.
For patients with biochemical recurrence, they want your PSA to be at least 0.2 in a post-radical prostatectomy situation, so unless my PSA jumps up again next week, I’m not eligible. (No, I’m not wanting it to jump up.) The cost is free to veterans and only veterans are eligible. You can learn more about the trial here:
So that’s about it from a toasty 90° F / 32° C San Diego.
Wear a mask. Stay apart. Stay well!