Dvory-Sobol and colleagues demonstrated that celecoxib induces G2/M arrest associated with cyclin-B1 down-regulation in K-RAS-transformed enterocytes [38], and in the COX-2 expressing murine breast cancer cell line MCa-35, celecoxib induced a G2/M arrest followed by apoptosis [39]. The gene discussed is KRAS; the disease is breast carcinoma.