Andy,
I've talked to Pietro, and this what he says:
"from a clinical point of view, If thalassemia intermedia patient needs trasfusion, is like thalassemia major, so, again, we have to think about bone marrow transplant.in other case, idrossiurea can help to increase fetal hb , not to be cured."
Let me know if this is enough or if you need other information.
Eugenio