On the whole the news continues to be good, with a bit of a caveat or two As my iron levels increase, so does the erythropoiesis. Not a surprise, just basic PV iron physiology. While I have been hovering above and below goal of 45%, the last two reads were 46.0 and 47.9. HGB is also steadily increasing, now reading 15.5. Time to do something different. I will post the numbers below.
I met with my MPN Specialist, Dr. Jain, on December 22 to review my status. The other caveat, continued elevation of Liver Function Tests (LFTs) was something we discussed. Current ALT=157, AST=94.0, ALP=211. All three the highest reads to date. The current elevations are not a concern as they do not meet the threshold of 5X Upper Limit of Normal (ULN). This is just part of what can happen when using the IFNs to treat PV. We will continue to monitor at 8-week intervals and keep an eye on the LFTs to ensure they stay below 5X ULN.
Dr. Jain does use HCT as the target to follow. We are in agreement that we do need to get the HCT < 45%. We discussed the two options of increasing Besremi or doing a venesection. Due to the LFT elevation, increasing the Besremi dose could be problematic. We decided to opt for a venesection at this point in time. Hopefully we can nudge the iron levels down just a bit to get the HCT a little below 45% - but not so low that I experience a return-to-symptom of iron deficiency. I am going to opt for a mini-phlebotomy (300ml) to see if that will work. Dr. Jain supports that option as worth trying. I can always repeat with another mini-phlebotomy if needed.
My hope is that the longer I am on Besremi, the more long-term benefit I will accrue. Hopefully,, I can eventually let iron levels return completely to normal while maintaining HCT < 45%. When rusfertide becomes available, I may opt for combination treatment if still needed.
Dr. Jain did agree that the reduction of JAK2 VAF from 38% to 9% is a good thing. She compared it to the reduction in VAF with other hematologic malignancies (eg., CML). We cannot yet prove how much of a good thing it is, but it cannot help but to be a good thing in the end.
I am planning for continued success in managing the MPN. Wishing you all the same moving forward.