OBP reads like batting average, but because it incorporates walks, OBPs are about 60 points higher on average. So the equivalent of a .300 hitter should have a .360 OBP or so. Getting on base is an important skill, so you want to use OBP to determine if the player in question is a good offensive performer.
Primary brain tumors are those that arise within the brain itself, unlike metastatic tumors that travel to the brain from a distant site. The most common types of primary brain tumors in adults are gliomas, glioblastomas, and lymphomas.
Beyond these two general classifications, there are many types of primary brain tumors that are named according to the type of cells or the part of the brain in which they originate. For example, most primary brain tumors begin in glial cells. This type of tumor is called a glioma.