Yes. Let me take a stab at that. So I sort of separated how one might think about the IO space and related to pembrolizumab and especially related to solid tumors. And so when you look at our internal pipeline, we speak about having over 25 mechanisms in the clinic. And you're aware of 3 immune modulatory mechanisms are advancing into Phase 3 and they have the opportunity to be co-formulated, TIGIT, LAG-3, our CTLA-4, we also showed ILT4. The other sort of thing that I would also emphasize is that the word is sometimes overused, but it's caught orthogonal. But I simply say that KEYTRUDA, when mixed with tumor-killing mechanisms or standard-of-care mechanism like chemo, surgery and potentially radiation, there seems to be enhancement. And because of that, that creates a possibility for us from a business development standpoint. And that business development you saw with Eisai and AZ, but we are excited with Seagen with the LIV-1 ADC, the Velos with the ROR1 ADC because essentially, there -- we're confident that pembro plus chemo works really well, right? We're first-in-class, best-in-class and transformative-in-class in lung. And so Seagen, Velos, those are ADCs where you're essentially developing a chemotherapy that's a little bit more precise. But our interest is past that. I would call your attention to Peloton, which is essentially targeting an oncogenic nodal pathway, and we would hope that, that not only can we advance that Peloton with a potential 2021 filing, but we're also interested in looking at that HIF-2α in relationship to pembrolizumab. But I also want to emphasize that that's focusing on KEYTRUDA as a foundational medicine that can combine with many internal and external assets. I would just end by simply saying, we are in a advantaged situation. And the advantage situation is that if you are developing a drug in cancer and you're a biotech company, you must ask what your molecule will do in relationship to IO. And if you're going to look for a partner, you're going to look for a partner who can give you that quickness, that speed and that rigor to advance that. And so when we say that we have 1,400 trials, including more than 950 combinations and more than 90 registrational trials, I would remind myself that, that most of those combinations are in combinations with other assets from other companies. So it allows us to do BD, not simply by looking at PowerPoint decks, but by actually getting our hands wet with the agents of other companies.