What is your approach to the use of intravenous sodium thiosulfate for the management of calciphylaxis in a patient with end stage kidney disease and on hemodialysis?

We have sodium thiosulfate 25gm IV each dialysis given during the last hour of treatment as a standard order in our dialysis order set. We have seen a useful response in some patients after several weeks, but there are no clear trial-based data to support the use of this treatment. I would certainly...