KCNN4 and neoplasm: We found that tumor formation efficiency of 100% (9/9) occurred in mice injected with 2 × 103, 2 × 104, and 2 × 105 lv-ctrl CSCs, which occurred in all four cell numbers of ov-KCNN4 CSC-bearing mice but only in 2 × 104 or 2 × 105 sh-KCNN4 CSC-inoculated mice.