Mammea siamensis Flower Extract-Induced Cell Death Apoptosis in HCT116 Colon Cancer Cells via Vacuolar-Type H+-ATPase Inhibition Associated with GSK-3β/β-Catenin, PI3K/Akt/NF-κB, and MAPK Signaling Pathway. This evidence concerns the gene NFKB1 and colonic neoplasm.