PTK2 and small cell lung carcinoma: This technique confirmed a significant increase in SCLC, compared with NSCLC and normal lung tissues, of FAK expression (0.177 ± 0.169 vs. 0.052 ± 0.066 vs. 0.013 ± 0.024, respectively) (p = 0.04) (Figure 5A–C) and phospho-FAK expression (0.727 ± 0.448 vs. 0.021 ± 0.053 vs. 0.056 ± 0.09) (p < 0.001) (Figure 5B,C).