Measurable or Minimal Residual Disease (MRD) is a term often used when treating patients with blood cancers. MRD is a small number of cancer cells left in the body after cancer treatment, and these cells can potentially cause relapse in these patients. The number of remaining cells is often too small to cause any signs or symptoms, and the number is too small even to be detected through traditional methods, such as complete blood counts or tracking serum proteins in the blood. Minimal Residual Disease can be found only by highly sensitive laboratory methods that can find one cancer cell among 1 million normal cells. Checking to see if there is Minimal Residual Disease...