Integrated lecture programs for high school students involving university teaching staff have recently become popular. Here, we report on such a program involving lectures on tumor pathology attended by 110 high school students at the Yokohama City University School of Medicine. Two weeks before the lectures at our university, the students were given a 45-minute introductory lecture by a teacher at their school. The 1-day course at our university comprised an overview lecture by the author (40 minutes), light-microscopic observation of histologic specimens of normal and tumor tissues (50 minutes), and a summary with an introduction to diagnostic pathology (20 minutes). During light-microscopic observation, medical students served as teaching assistants. The high school students were given handouts of microscopic