Dr. Laurie Glimcher, a trailblazing female scientist, is coming home to Boston's Longwood Medical Area — though not to the job some would like her to have. Glimcher, 64, dean of Cornell University's medical school, is known for breaking glass ceilings, making big discoveries about the immune system, and helping other women along the way — making her a prime candidate to be the first female dean of Harvard Medical School. The job would be "extremely prestigious," she said, but she decided not to pursue it: Instead, she'll become the next CEO of the Dana-Farber Cancer Institute, one of Harvard's affiliated teaching hospitals.