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Sorry to hear about your aunt. TTP is when your platelets (which stop bleeding) get attacked by your body. This can happen with cancers, and she may have a recurrence of colon or thyroid cancer.
However, some medications can mimic TTP, as they interact with the body to cause a quick reduction in platelets. You should ask the hematologist if your aunt has had any exposure to Heparin or lovenox. If so (and it is likely in the ICU, especially in the IV's), these should all be stopped as they can cause HIT (heparin induced thrombocytopenia).
Be sure that this is addressed.
If it is confirmed that she has TTP and not HIT, they should look for recurrence of cancer. In the meantime, it is true that a platelet transfusion will likely just add "fuel to the fire" and is not a great idea.
Steroids are controversial in this condition, but ask the hematologist about their possible role in this situation.
Good luck to you and your Aunt.
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