(A) mRNA expression of Rab7a in MDA-MB-231 cells transfected without shRNA lentivirus (Ctrl), shNC lentivirus (NC), or shRab7a lentivirus (KD1, 2, 3, and 4). **P<0.01; n=3. (B) Green fluorescence images of MDA-MB-231 cells transfected without shRNA lentivirus (Ctrl), shNC lentivirus (NC), or shRab7a lentivirus (KD2). (C) Western blots of Rab7a in cells as shown in (B). (D) Cell viability of Ctrl, shNC, and shRab7a (KD2) MDA-MB-231 cells was determined by MTT assay from day 1 to 5. **P<0.01; n=5. (E) Colony formation of indicated cells. (F) Quantitative results of colony formation in (E). **P<0.01; n=3. Abbreviation: NS, no significance.