Comparison of the PPARδ and miR-17 expression levels between NSCLC and control tissue in the studied histotypes showed significantly lower expression values of both PPARδ and miR-17 in the tumour tissue in the AC group (p = 0.0004 and p = 0.0120; respectively, Mann–Whitney U test). The gene discussed is PPARD; the disease is non-small cell lung carcinoma.