LNCaP, 786-0, ACHN and HT1376 cells were obtained from ATCC (Manassas, VA) and were maintained as recommended. C4-2 cells were obtained from Johns Isaacs (Johns Hopkins University, Baltimore, MD) and maintained in RPMI-1640. DPL-S11 cells were maintained in DMEM as previously described [44 (link)]. LMD cells are a derivative of MDA-MB-231 cells and were provided by Sridhar Nimmagadda (Johns Hopkins University, Baltimore, MD). LNCaP-MLuc are stable LNCaP cells derived to express the hMLuc reporter through the hβ-Actin promoter and enhancer; these cells are maintained under blasticidin selection as previously described [45 (link)]. All media contained 10 μg/mL ciprofloxacin hydrochloride (U.S. Biological, Swampscott, MA) and 10% fetal bovine serum.