George D. Yancopoulos
Management
Yeah, and to add to that, I think that one of the biggest underlying fears for this class, certainly by outside people, but also by ourselves, was that the very small increase in certain arthropathy events, certain joint pathologies, that were seen particularly in combination with NSAIDs, but also a small increase even in monotherapy, might actually be reflecting a much bigger, somewhat invisible, problem that there was a bigger, destructive process that would then be seen over longer periods in time and so forth. And this is why we did this, as Len said, this extensive imaging of both the index joints but also non-index joints to see whether overall the skeleton was really changing. And as we've already said, the thing that was very gratifying was that, unfortunately for these patients suffering from this important problem, there is already significant skeletal pathology at baseline. These patients have these so-called subchondral insufficiency fractures and you can even see undiagnosed osteonecrosis in these patients and so forth. And these events, both in the index and the non-index joints, were not dramatically increased by treating with NGF. And one fear, for example, was that these asymptomatic subchondral insufficiency fractures may be happening much more frequently with drug and then eventually leading to much higher incidences of events down the line. And so it was very comforting not to see this. That said, there remains, as with any drug and certainly with a drug this active, there will continue to be risks associated with treatment. But one has to balance that with all the benefits that could be provided. Pain is a very serious problem for a lot of people, especially people suffering from osteoarthritis. And the options, obviously, as you know, are quite limiting with no new mechanism of action drugs added to this field for decades. And so the possibility and the opportunity of a new mechanism of action class that might have a different profile and also different risk profile as compared to, for example, opiates and NSAIDs and other drugs with serious risks, we're think can offer important options for patients.