26/48 T-ALLs (54.2%) had an immature T-receptor immunogenotype [37], comprising 9 IM0 (germline TR), 9 IMD (TRD rearrangement only) and 8 IMG (TRG and TRD rearranged but absent or incomplete TRB rearrangement) leukemias. The gene discussed is THRB; the disease is leukemia.