HOXA11 and gastric cancer: Quantifying the number of tumorsphere in culture, and confirming that overexpression of HOXA11 can enhance tumorsphere-forming capacity in gastric cancer cells, conversely, knockdown of endogenous HOXA11 in MGC-803 cells led to a decrease in tumorsphere numbers (NCI-N87: P<0.001, SGC-7901: P<0.001 and MGC-803: #1: P<0.001 and #2: P<0.001; Figure 3E).