It might help to reset that a little bit.
When we do a market authorization, we're taking a look at studies in particular types of patients, who will be selected depending on what you want to prove with the drug. If it's for a cancer indication of a certain sort, you'll state that, and then you'll do your study on it, and that'll be the basis of the approval. It may be that the same therapy is effective for other types of cancer or other disease states, but we don't know that, because we haven't seen a study in that kind of population, and that's really what off-label means: it means we just don't have that pre-market authorization.
In a situation of practice, it may be that a therapy is extended beyond what's known and studied, based on other things such as medical literature and so on. This kind of practice is often very well founded, but what we get back is not from a population, so if the drug is being used consistently in this way, we're not getting back that kind of information the way we should be, and that's what we're trying to target.
Is that helpful to you?