What type of testing is important to monitor for BPDCN? BPDCN or Blastic Plasma Cytoid Dendritic Cell Neoplasm is a very rare form of blood cancer in the leukemia family. It's a challenging leukemia because of its rarity and therefore lack of familiarity by many patients who are getting that diagnosis but also their treatment teams who may not have seen many cases. What I would say for monitoring, the most important thing to recognize is that BPDCN has features of both acute leukemia and lymphoma. The disease can involve the skin, bone marrow, the blood, lymph nodes, as well as the central nervous system. Over time, what's most important is that a monitoring plan involves all the different disease compartments with particular attention to what parts of the body were affected at diagnosis, but recognizing that that could change over time. Patients should have their blood and bone marrow monitored, they should have their skin monitored through exams, imaging, as well as periodic examination of the central nervous system by analysis of the spinal fluid. The exact treatment schedule should be individualized to the patient and their particular disease characteristics, but consideration of all those different potentially involved disease areas is important.