EGCG and Q in combination with Doc enhanced the inhibition of tumor cell colony formation. LAPC-4-AI (A) and PC-3 (B) cells were treated with vehicle control, 40μM EGCG+5μM Q, 5nM Doc, or EGCG+Q+Doc at same concentrations for 48h. Then the cells were seeded onto 24-well plate which was pre-coated with Matrigel. Fresh medium was changed every two days and the cells were allowed to grow for 5 days. The number of colonies containing at least 10 cells was counted. Data are presented as mean ± SD. NT: non-treatment, DMSO control; Q: quercetin; Doc: docetaxel. Compared to NT, *P<0.05; **P<0.01.