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 American Brain Tumor Association estimates that about 40,900 people will be diagnosed with a primary brain tumor in the US this year (rate of 14 per 100,000 people). Metastatic (secondary) brain tumors are more common than primary brain tumors by at least 10 to 1, and they occur in 20% to 40% of cancer patients.rimary brain tumors may be benign or malignant. A benign brain tumor grows slowly, has distinct boundaries, and rarely spreads. Although its cells are not malignant, this tumor composed of benign cells and located in vital areas can be considered life-threatening.