In the RT-qPCR, RacGAP1 expression was highly significantly increased in AC as compared to TC (Mann-Whitney-Test: U = −4.119, p < 0.001) and in SCLC/LCNEC as compared to AC (Mann-Whitney-Test: U = −4.116, p < 0.001 / U = −3.535, p < 0.001) (see Figure 3). Here, RACGAP1 is linked to small cell lung carcinoma.