Professor Iwama specializes in stem cell biology, hematology, and oncology. He is exploring the molecular mechanisms of the self-renewal and differentiation of hematopoietic stem cells based on the understanding of epigenetic regulation of gene expressions, and is promoting research into hematopoietic neoplasms that arise from breakdown in that mechanism. He has been serving as the representative for the Research on Innovative Areas "Stem Cell Aging and Diseases" since 2014, launching analysis on the physiological and pathological changes in stem cells that arise from aging.