Funding for this research was provided by:
National Cancer Institute (U24 CA114766, U10 CA98543, U10 CA180899, U10 CA180886, R01 CA204396, U10 CA098413, P30 CA008748)
Received: 21 November 2018
Revised: 2 January 2019
Accepted: 23 January 2019
First Online: 13 February 2019
Compliance with ethical standards
: AK is a consultant for Novartis. The other authors declare that they have no conflict of interest.