The doctors will be considering both the efficacy of the two protocols in generaly, and how your husband in particular will do with the different protocols. One of the issues with the three doses is whether or not the patient gets all three doses due to toxicity. You might ask about that.

I can't find any direct studies comparing the three vs. seven dose results, but maybe I'm just having a bad search day. Ask the doctors about this - they may have this information. It looks like some institutions prefer one or the other protocol.

My very best wishes to both of you - this is a hard journey but the I hope that the resources and support of this site will help you as it did me.
Maria