Merck provided some of the clearest direction yet regarding its ambitions in oncology to improve on its blockbuster immunotherapy Keytruda.

Merck provided some of the clearest direction yet regarding its ambitions in oncology to improve on its blockbuster immunotherapy Keytruda.

Merck CEO Rob Davis said the drugmaker has evolved beyond Keytruda, with more than 20 potential blockbuster launches over the next five years.