My primary research interests involve using population-based studies of genetic, circulating, and tumor biomarkers to investigate the role of inflammation and infections in carcinogenesis. I also have a general interest in prostate cancer epidemiology and the identification of patient and tumor characteristics that could reduce overdiagnosis and overtreatment. Collaborating with research pathologists, urologists, medical oncologists, molecular biologists, immunologists, virologists, and bioinformaticists, I have utilized data from a large Swedish population-based studies (CaPS and PCBaSe) and a Swedish randomized trial (SPCG-4), Swedish clinical cohorts, the Physicians’ Health Study, and the Health Professionals Follow-up Study. Through collaborations with Swedish and US-based investigators, I am expanding my research focus to study the role of infections on various malignancies. I am involved in ongoing studies of HPV infection in penile carcinoma and tumors of the head and neck. Moreover, I am pursuing projects that investigate malignancies in HIV-infected populations, including a study to shed light on the lower incidence of prostate cancer in HIV-positive compared to HIV-negative men.