In February my PSA was 18.2. In March/April I had 5 doses of SABR and my PSA has now dropped to 10.4. I had, of course, hoped/imagined it would fall to o and was initially very alarmed but I THINK that such a drop a month after finishing SABR (without ADT) is actually quite positive? Am I right?
Hello Alasdair
SABR is like any other form of radiotherapy and works over time. Your lowest or nadir reading should be about 18 months after finishing the course.
Personally I would have hoped for a bigger initial drop. I assume you will tested every 3 months to keep an eye on it.
I wish you well with the future results.
Best wishes - Brian.

Macmillan Support Line - 0808 808 00 00, 7 days a week between 8am-8pm
Strength, Courage, Faith, Hope, Defiance, VICTORY.
I am a Macmillan volunteer.
Hello Alasdair
That sounds fine in that case - I do hope you get a significant drop in the next few months, please do keep us up to speed.
Best wishes - Brian.

Macmillan Support Line - 0808 808 00 00, 7 days a week between 8am-8pm
Strength, Courage, Faith, Hope, Defiance, VICTORY.
I am a Macmillan volunteer.
Hi Alasdair
It has always been my understanding that you leave it for six months after RT finishes.
That is what happened to me and lots of others on here talk about a gap of 3-6 months after RT is over before doing a first PSA.
So I suggest push for one between 3-6 months and hopefully will be lower as 10.4 Def seems a bit high, so give more time
Best wishes
Steve
Hi Alasdair , my PSA went up slightly just after SABR but that might be explained by stopping Enzalutamide about 2 months earlier. Certainly after 3 months it was beginning to drop again. I think you are just too early to see results. Hopefully the trend continues over the next few months.
Best wishes, David
Please remember that I am not medically trained and the above are my personal views.
Whatever cancer throws your way, we’re right there with you.
We’re here to provide physical, financial and emotional support.
© Macmillan Cancer Support 2026 © Macmillan Cancer Support, registered charity in England and Wales (261017), Scotland (SC039907) and the Isle of Man (604). Also operating in Northern Ireland. A company limited by guarantee, registered in England and Wales company number 2400969. Isle of Man company number 4694F. Registered office: 3rd Floor, Bronze Building, The Forge, 105 Sumner Street, London, SE1 9HZ. VAT no: 668265007