Beside OR2B6, OR56A3, OR4K15, OR2T8, OR4N4, OR8G5, OR2B2, OR13H1, OR7D2, and OR52N4 showed no expression in normal breast tissues, but were not uniformly expressed or even not expressed at all in most breast carcinoma tissues and cell lines. The gene discussed is OR4N4; the disease is breast carcinoma.