For T cell ALL treated in CR (without transplant), how often do you do BM biopsies as part of surveillance, and for how long?

The role of surveillance bone marrow exams in ALL (either B or T-lineage) is a matter of some debate. Thoughtful clinicians can disagree, but in my practice, I do NOT routinely perform these procedures, instead reserving them for signs or symptoms suspicious for relapse. This is analogous to how the...