PLK5 and non-small cell lung carcinoma: PLK5 protein expression was decreased in tumor tissue {IHC score [mean ± standard deviation (SD)]: 1.6 ± 2.2} compared with nontumor tissue [IHC score (mean ± SD): 3.6 ± 3.1] in NSCLC patients (P < 0.001) (Figure 1B).