Indeed, TTF-1 was expressed in 6 primary tumours, 4 LcPDX at P ≤ 10 and 4 LcPDX at P > 10;and vimentin in 4 primary tumours, 6 LcPDX at P ≤ 10 and 8 LcPDX at P > 10. The gene discussed is TTF1; the disease is neoplasm.