Cessation is a very reasonable option. Take a look at the Mahon presentation from the latest ASH on the EUROSKI study where 0.01 (MR4) was the target for stopping. Results look very good with a threshold for restarting being 0.1 or loss of MMR. If the results are valid by IS and you are able to do monthly monitoring at least for the first year and at least 2-3 monthly for the next couple, so that you can restart if necessary, go ahead. Of course, participation on a stopping study if possible is always preferred.