Figure 9. Validation of the expression levels of seven genes in lung adenocarcinoma. (A) RT-qPCR assay detected mRNA levels of the seven genes related with ferroptosis in lung adenocarcinoma. (B) Immunohistochemistry assay detected protein levels of the seven genes related with ferroptosis in lung adenocarcinoma. * represents P < 0.05, ** represents P < 0.01, *** represents P < 0.001.