Ibrutinib combination therapy for advanced gastrointestinal and genitourinary tumours: results from a phase 1b/2 study oleh Do-Youn Oh, Maria Alsina Maqueda, David I. Quinn, Peter J. O’Dwyer, Ian Chau, Sun Young Kim, Ignacio Duran, Daniel Castellano, Jordan Berlin, Begona Mellado, Stephen K. Williamson, Keun-Wook Lee, Francisca Marti, Paul Mathew, Muhammad Wasif Saif, Ding Wang, Elizabeth Chong, Jacqueline Hilger-Rolfe, James P. Dean, Hendrik-Tobias Arkenau