Cognitive Sparing during the Administration of Whole Brain Radiotherapy and Prophylactic Cranial Irradiation: Current Concepts and Approaches

Table 1

RTOG RPA Classification for brain metastases.

Class	Characteristics	Median Survival (months)
I	KPS 70 or greater, age 65 years or less, primary disease controlled, no extracranial metastases	7.1
II	All others	4.2
III	KPS < 70	2.3