Involvement of Mitochondrial and Akt Signaling Pathways in Augmented Apoptosis Induced by a Combination of Low Doses of Celecoxib and <i>N</i>-(4-Hydroxyphenyl) Retinamide in Premalignant Human Bronchial Epithelial CellsClaudia P. Schroeder, Reuben Lotan|Cancer Research|2006Cited by 23