Coamplification of erbB-2, topoisomerase IIα and retinoic acid receptorα genes in breast cancer and allelic loss at topoisomerase I on chromosome 20. - Keith,W.N.; Douglas,F.; Wishart,G.C.; McCallum,H.M.; George,W.D.; Kayxe,S.B.; Brown,R. (Eur J Cancer [Am], 1993)