Since 1983, Hasford serves as the responsible biostatistician of the German Chronic Myeloid Leukemia Study Group which runs randomized long term clinical trials. He performs prognostic research and has published as the main author several properly validated prognostic scores for chronic myeloid leukemia and lymphoma including the Hasford Score. In pharmacoepidemiology, he specialized in drug utilization research, in particular with pregnant women and with pharmacy claims data, patients’ compliance and persistence. He was a member of the European Network of Centres for Pharmacoepidemiology and Pharmacovigilance which is coordinated by the European Medicines Agency.