A Study of Pembrolizumab on the Tumoral Immunoprofile of Gynecologic Cancers

Epithelial gynecologic malignancies are tumors of müllerian origin, which include ovarian, endometrial, fallopian tube, and primary peritoneal cancers, and account for \>70,000 new diagnoses and \>22,000 deaths per year in the United States alone. Treatment typically consists of a thorough cytoreductive and staging surgery in combination with platinum/taxane chemotherapy. Newer approaches adding anti-angiogenic therapies to chemotherapy have resulted in moderate improvements in recurrence free survival. However, despite these aggressive treatments, the majority of women with advanced stage at diagnosis will experience relapse. Unfortunately, relapsed disease is incurable and women ultimately die of their disease despite maximal efforts at cancer control using subsequent chemotherapy or targeted agents. There has been significant interest in incorporating immune checkpoint therapies in the treatment of gynecologic malignancies, especially given the durable remissions associated with these therapies in the treatment of melanoma and early indications of durable responses in recurrent ovarian cancer. At this time, little is known about whether or how to combine chemotherapy, anti-angiogenic therapies, and immunologic therapies for maximal benefit. Understanding the tumor microenvironment, particularly immune and angiogenic factors that contribute to tumor survival, as well as the changes that occur in response to immunotherapy is critical to identify favorable biomarker profiles which could lead to improved prognostic outcomes and inform the development and sequencing of therapies to maximize benefit.