The cells of the adaptive immune system are special types of leukocytes, called lymphocytes. B cells and T cells are the major types of lymphocytes and are derived from hematopoietic stem cells in the bone marrow.
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Peptic ulcers are chronic; they may recur at any time. Ulcers are rarely a prelude to cancer, but some ulcers, especially gastric ulcers, are an erosion of the stomach due to cancer. Even if ulcers are not cancerous, they can be very dangerous. An untreated ulcer can cause intestinal obstruction or rapid bleeding into your intestinal tract, which can be fatal.