As an example, pilocarpine 72 is used for the treatment of xerostomia and glaucoma [93], topsentin 73 shows anticancer activity [94] and isonaamine A 74 also shows anticancer activity through its action as an inhibitor of the epidermal growth factor receptor (EGFR) [95] (Figure 31). This evidence concerns the gene EGFR and xerostomia.