Ouabain also inhibited STAT3-mediated transcription and downstream target proteins, as well as suppressing STAT3 levels and phosphorylation.79 Hyrcanoside (77) and its two derivatives [deglucohyrcanoside (78) and cymarin (79)] showed anticancer potential against leukemia, lung adenocarcinoma, colorectal carcinoma, adenocarcinoma, breast carcinoma, and osteosarcoma by inducing cell cycle arrest in the G2/M phase.80 Phyto-compounds digoxin (80), digitoxin (81), digitoxigenin (82), lanatoside (83), oleandrin (84) and neritaloside (85), reported in Table 2 are cardiac glycosides. Here, STAT3 is linked to breast carcinoma.