In this instance, Roche might have been able to dose Humira using the de facto standard because the language in the FDA label leaves some wiggle room about weekly dosing w/o methotrexate.
Clearly, however, it was in Roche’s interest to under-dose the Humira patients in the ADACTA study, so that’s what they did. Most pharma companies would probably have done the same.
According to Roche, the (biased) Actemra-vs-Humira study we recently discussed was the first head-to-head trial of two biologics in RA. I knew there hadn’t been many such trials because most drug/biotech companies hate them, but I hadn’t realized that this was the first.