To confirm whether CDX2 regulates MDR1 expression in ovarian mucinous adenocarcinoma cells, we generated a polyclonal population of MN‐1 ovarian cancer cells expressing high levels of CDX2 by infecting these with replication‐defective retroviruses carrying a full‐length human CDX2 cDNA 14. The gene discussed is ABCB1; the disease is ovarian carcinoma.