Expression of transcripts in human tumors. Box plots of expression of transcripts in human tumors show significant differences in (a) ICAM1 (p=0.013), CRK (p=0.027), CD36 (p=0.035) and IQGAP1 (p=0.027) mRNA expression values between hypothalamo-chiasmatic pilocytic astrocytomas (H/C PA) and cerebellar PA and in (b) ICAM1 (p=0.002) and CRK (p<0.0001) mRNA expression values between glioblastomas (GBM) and PA. The lower and upper edges of the box represent the first and third quartile respectively, while a horizontal line within the box indicates the median. The vertical length of the box represents the interquartile range (IQR). The most extreme sample values (within a distance of 1.5 IQR from the median) are the endpoints of the lines extending from the box. a.u.: arbitrary unit.