Immunohistochemical staining of tumour paraffin-embedded sections for the expression of Ki67 proliferation antigen showed that the RelA/p65KD human NSCLC cell lines displayed reduced Ki67 expression compared to vector control counterparts (Figure 1F), indicating that reduced cell proliferation accounts for the decreased tumour growth in vivo in mice. The gene discussed is MKI67; the disease is non-small cell lung carcinoma.