A) RNA level of GNG4 in different GBM subtypes, B) RNA level of CXCR4 in different GBM subtypes, C) Correlation of RNA level of GNG4 with that of CXCR4, D) Correlation of RNA level of GNG4 with protein levels of ERK upstream molecule, phospho-Mek1. p-value was calculated by Student’s t test where *, ** and *** represents p-value of < 0.05, < 0.01 and < 0.001 respectively.