PTK2 and glioma: Expression analysis of FAK showed a statistically significant (p < 0.01) reduction in its expression in U87 glioma cells after treatment with rGO/ATS (log2RQ = −0.36 ± 0.09078) and rGO/TUD (log2RQ = −0.34 ± 0.09078), whereas in healthy Hs5 cells, it was observed after treatment with all tested flakes: GN/ExF (log2RQ = −0.31 ± 0.1084), rGO/ATS (log2RQ = −0.49 ± 0.1084), and rGO/TUD (log2RQ = −0.65 ± 0.1084).