Introduction: Research is an important area in medical education and should be promoted during the forming years. Thesis is an investigation to acquire a professional title, but there is a decrease in its production as there are other ways of graduation. Objectives: To determine the number of theses, area, specialty and designs utilized. To determine the collaboration between specialists depending on the area and design of investigation. To determine the proportion of theses published in an indexed journal. Design: Bibliometric study. Setting: Faculty of Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru. Participants: Theses of Medicine undergraduates. Interventions: Theses elaborated during 1998-2008 were collected from the Library of the Faculty. We read the summaries and in case of doubt, the complete thesis. We analyzed the patterns of frequency through Microsoft Office ...