“…The failure of conventional therapy with high dosage corticosteroids and repeated whole blood, packed cell, and platelet transfusions prompted attempts at marrow stimulation with phytohaemagglutinin (PHA) (Baker & Oliver, 1965;Catovsky & Sforza, 1967;Grunewald et al, 1965;Hayes & Spurr, 1966;Retief, Wasserman & Hofmeyer, 1964) and oxymetholone (Sanchez-Medal, G6mez-Leal & Duarte-Zapata, 1966;Sanchez-Medal et al, 1964;Silink & Firkin, 1968;Allen et al, 1968). These were tried in turn, corticosteroids being continued throughout to reduce the bleeding tendency.…”