Which of the following statement about astrocytoma is false

Astrocytomas are a type of cancer of the brain. They originate in a paicular kind of glial cells, star-shaped brain cells in the cerebrum called astrocytes. This type of tumor does not usually spread outside the brain and spinal cord and it does not usually affect other organs Narrow zones of infiltration (mostly noninvasive tumors; e.g., pilocytic astrocytoma, subependymal giant cell astrocytoma, pleomorphic xanthoastrocytoma), that often are clearly outlined on diagnostic images Diffuse zones of infiltration (e.g., high-grade astrocytoma, anaplastic astrocytoma, glioblastoma), that share various features, including the ability to arise at any location in the central nervous system, but with a preference for the cerebral hemispheres; they occur usually in adults, and have an intrinsic tendency to progress to more advanced grades Astrocytoma causes regional effects by compression, invasion, and destruction of brain parenchyma, aerial and venous hypoxia, competition for nutrients, release of metabolic end products (e.g., free radicals, altered electrolytes, neurotransmitters), and release and recruitment of cellular mediators (e.g., cytokines) that disrupt normal parenchymal function.[Secondary clinical sequelae may be caused by elevated intracranial pressure attributable to direct mass effect, increased blood volume, or increased cerebrospinal fluid volume. Molecular alterations A genome-wide pattern of DNA copy-number alterations (CNAs) has been uncovered, which is correlated with a patient's survival and response to treatment. This pattern identifies among glioblastoma as well as lower-grade astrocytoma patients a subtype, where the CNA genotype is correlated with an approximately one-year survival phenotype. Ref Harrison20th edition pg 2445