9. Camptotheca Tree: Colorectal Cancer Fighter
This Chinese tree contains camptothecin in its bark, which researchers discovered inhibits an enzyme called topoisomerase I. This inhibition prevents cancer cells from replicating properly. Scientists modified the natural compound to create irinotecan and topotecan, which treat ovarian and colorectal cancers. These semi-synthetic derivatives offer better solubility and reduced toxicity than the natural version. Their development highlights how chemical modifications can enhance natural compounds for medical use.