Kombinationen af interferon alfa- 2b og cytarabin (Ara- C) givet under de første 12 måneders behandling har vist signifikant at øge hyppigheden af større cytogenetisk respons og signifikant at forlænge den samlede overlevelse efter 3 år sammenlignet med interferon alfa- 2b givet alene.
The combination of interferon alfa-2b and cytarabine (Ara-C) administered during the first 12 months of treatment has been demonstrated to significantly increase the rate of  128 major cytogenetic responses and to significantly prolong the overall survival at three years when compared to interferon alfa-2b monotherapy.