EGFR and central nervous system cancer: qPCR analysis of a panel of these and 15 other murine gliomas containing regions comprised of recruited cells was consistent with amplification of EGFR at the DNA level occurring at most in 6 of 18 (∼30%) of all cases, while IGFR was only amplified at most in 2 of 19 (∼10.5%) (Figure S6g,h).