Da disse to leukæmiformer betragtes som sjældne, blev Sprycel udpeget som "lægemiddel til sjældne sygdomme" den 23. december 2005.
Because the number of patients with these two forms of leukaemia is low, the diseases are considered ‘ rare’, and Sprycel was designated an ‘ orphan medicine ’ (a medicine used in rare diseases) on 23 December 2005.