IFNB1 and myeloid sarcoma: Ever since the introduction of insulin as the first therapeutic protein, it has been an ever-expanding field.1 Biotherapeutics are used to treat a broad range of severe diseases, for instance the immune messenger cytokines interferon beta (IFNβ) and alpha (IFNα) products are used to treat multiple sclerosis (MS)2 and viral diseases3 respectively.