Serum thymidine kinase 1 activity as a pharmacodynamic marker of cyclin-dependent kinase 4/6 inhibition in patients with early-stage breast cancer receiving neoadjuvant palbociclib oleh Nusayba Bagegni, Shana Thomas, Ning Liu, Jingqin Luo, Jeremy Hoog, Donald W. Northfelt, Matthew P. Goetz, Andres Forero, Mattias Bergqvist, Jakob Karen, Magnus Neumüller, Edward M. Suh, Zhanfang Guo, Kiran Vij, Souzan Sanati, Matthew Ellis, Cynthia X. Ma