I am also on the same trial. I struggle with low neutrophil counts for the last 6 months having had no problems for 18 months.
At the moment I am on 10mg for three weeks then 2/3 weeks recovery. I have had to have a few GCs-f injections to boost the neutrophils.
I do not know what will happen ,after my lastest course, as it seems to be such a struggle to keep the neutrophils up.
It is a difficult call as I am sure the drug is helping to keep the paraproteins just under 5% but the neutropenia allows you to be more open to infection….