RT Journal A1 Hollestein LM, Koomen ER, Nijsten T T1 Chemoprevention for keratinocytic (pre)cancers: Balancing the risks and benefits JF Archives of Dermatology JO Archives of Dermatology YR 2012 FD May 1 VO 148 IS 5 SP 638 OP 640 DO 10.1001/archdermatol.2011.2273 UL http://dx.doi.org/10.1001/archdermatol.2011.2273 AB Setting: Eight centers in the United States participated and included 240 patients from January 2001 to November 2006, when the Food and Drug Administration requested termination of this trial after the worldwide withdrawal of rofecoxib.