Missing tumor measurement (TM) data in the search for alternative TM-based endpoints in cancer clinical trials An, Ming-Wen , Tang, Jun , Grothey, Axel , Sargent, Daniel J. ... - - Contemp Clin Trials Commun - 2019 Manuscript - Secondary-not-in-original - Primary - GI - A151817 , N0026 , N9741 , NCCTG-N9741