Moreover, progression-free interval (PFI) analysis revealed that high expression of FN1 was significantly associated with poorer PFI in NSCLC patients (HR = 1.077, p = 0.028), while CCND1 expression showed no significant correlation with PFS (HR = 1.022, p = 0.639). The gene discussed is CCND1; the disease is non-small cell lung carcinoma.