His clinical interest is breast pathology. He is a PI at dept. of Oncology and Pathology, Karolinska Institutet and his research team is involved in both clinical and translational projects. His main research focus is cancer stem cells, cancer genomics/transcriptomics and image analysis for therapy prediction. Johan is heavily involved in the implementation of personalized cancer medicine at Karolinska. Associate prof. Johan Hartman is author or co-author of more than 35 peer reviewed articles, many in high-impact journals and with totally more than 2500 citations.