GlaxoSmithKline CEO Andrew Witty attributes the company's success to sticking to the tried-and-true business model of investing in research and development and not transitioning to an acquisition model.
Witty told CNBC's "Closing Bell" on Monday that the key is to be patient and to see the value of investing in innovation.
"What we have to stay focused on is the fundamentals of the value of innovation and discovery of medicines and vaccines that make a real difference to patients," he said.
