Guarantor of the article: Enrico N. De Toni, MD.
Specific author contributions: The 4 authors equally contributed to this letter, which is written on behalf of all the authors of the original manuscript.
Financial support: None to report.
Potential competing interests: E.D.T. has served as a paid consultant for AstraZeneca, Bayer, BMS, EISAI, Eli Lilly & Co, Pfizer, IPSEN, and Roche. He has received reimbursement of meeting attendance fees and travel expenses from Arqule, BMS, Bayer, Celsion and Roche, and lecture honoraria from BMS and Falk. He has received third-party funding for scientific research from Arqule, AstraZeneca, BMS, Bayer, Eli Lilly, and Roche.