Among these, some showed inhibitory action on XIAP (i.e., apigenin, chrysin, quercetin, kaempferol, casticin, neobavaisoflavone, silibinin, naringenin) and survivin (i.e., chrysin, linarin, galangin, quercetin, kaempferol, casticin, irigenin, silibinin, icaritin, icariside II), which are overexpressed in a variety of human cancers and are considered the most potent members of the family [101,102]. Here, XIAP is linked to cancer.