For instance, studies exploring the correlation between CCND1 and prognosis in non-small cell lung cancer (NSCLC) reported contrasting results, including positive correlation, inverse correlation, or negligible influence (Anton et al., 2000; Esposito et al., 2005; Dworakowska et al., 2005). This evidence concerns the gene CCND1 and non-small cell lung carcinoma.