Dr. Pashtoon Kasi, MD, MS is an oncologist and researcher at Weill Cornell Medicine and NewYork-Presbyterian Hospital. He focuses on treating patients with gastrointestinal (GI) cancers and the treatment of patients with novel drugs/early-phase clinical trials. At Weill Cornell Medicine, Dr. Kasi additionally serves as the Director for Colorectal Cancer Research, as well as Precision Medicine Director for Liquid Biopsy Research at the Englander Institute of Precision Medicine.

Dr. Kasi received his medical degree from the prestigious Aga Khan University (AKU) in Pakistan in 2006. He did a year of internship at the University of Texas Health Science Center at San Antonio (UTHSCSA) in 2009. Following this Dr. Kasi completed his residency at the International Scholars Program (ISP) at the University of Pittsburgh Medical Center (UPMC). Subsequently in 2016 he completed a fellowship in oncology and hematology at the Mayo Clinic. At the Mayo Clinic, he also completed a post-doctoral master's program at the Mayo School of Graduate Medical Education (MSGME) in clinical and translational sciences (Masters in Basic Sciences).

Prior to joining Weill Cornell Medicine, Dr. Kasi served as an Associate Professor of Medicine at the Division of Hematology and Oncology at the University of Iowa. Before that, he was an Assistant Professor of Medicine and Oncology at both University of Iowa and Mayo Clinic. Dr. Kasi was one of a select few who were appointed to the academic post of Assistant Professor of Oncology and Assistant Professor of Medicine at the Mayo Clinic during his fellowship due to his research and academic achievements.

Dr. Kasi's research focus has been on "liquid biopsies" [(circulating tumor DNA (ctDNA) and circulating tumor cells (CTCs)], alongside developing and conducting clinical trials focused on precision oncology and precision medicine. Dr. Kasi is an author and editor of several books including: "Research: What, Why and How: A Treatise from Researchers to Researchers", and "Impact of circulating tumor DNA (ctDNA) in Patients with Gastrointestinal Malignancies" and has over 100 publications in leading peer-reviewed journals. Additionally, Dr. Kasi has been active as a principal investigator on numerous investigator-initiated, industry-sponsored as well as cooperative group clinical trials in oncology.