Leo Viana Nicacio

Leo Viana Nicacio, MD, currently serves as Chief Medical Officer at Protara Therapeutics since April 2025, following a role as Sr. Vice President of Clinical Development and Medical Affairs for Solid Tumors at Menarini Stemline. Previous experience includes serving as Vice President of Clinical Development at Pfizer and Vice President of Clinical Development at Seattle Genetics, where key contributions involved leading the global development of multiple oncology therapeutics. Additional roles include Sr. Global Medical Affairs Leader at AstraZeneca and Vice President of Oncology at Flatiron Health, a tech company focused on real-world oncology data. Leo Viana Nicacio's educational background includes an oncology degree from Hospital Sirio Libanes and internal medicine training from Hospital Universitario Sao Jose, complemented by business training at Harvard Business School.