Dr Seo told me the decision to use 2 or 4 infusions has been based on which center is doing the infusion. It sounds a little crazy, but he said some centers (eg Mayo) have just always done 2 while others (eg JHU) have always done 4. So they each kept doing what they'd always done!
I did 2 rounds of 4 infusions in the past, but this February he decided I would do only 2. He said there is more research now that show that 2 infusions are as effective as 4. Also, since I have terrible side effects from it, he thought I might do better getting half the dose. I did do better (it was still pretty awful) but I have my doubts as to whether it worked as well. I don't think you should extrapolate from my experience, though.
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