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.
The most commonly diagnosed primary brain tumor of adults is glioblastoma multiforme (grade IV). The incidence is two to three cases per 100,000 population per year. An estimated 13,000 deaths in 2000 were attributed to primary malignant brain tumors (PMBTs).