Monoclonal B-cell lymphocytosis (MBL) is when you have a high number of identical B cells, under 5,000 per microliter, for at least 3 months. It usually causes no symptoms or need for active treatment ...
About 8 to 10 million Americans over age 40 have an overabundance of cloned white blood cells, or lymphocytes, that hamper their immune systems. Although many who have this condition - called ...