Aspergillus, a common fungus, produces powerful anticancer compounds when found in ocean environments. These compounds mainly come from ocean floor sediments (43%), miscellaneous marine sources (31%), sea sponges (16%), and seaweed (10%). The compounds fall into several chemical categories: organic compounds (25%), terpenoids (21%), peptides (18%), phenolics (17%), polyketides (12%), alkaloids (5%), and steroids (2%). These natural compounds can kill cancer cells while leaving healthy cells unharmed. Two standout compounds include Terrein, which fights ovarian cancer, and Wentilactone B, which attacks liver cancer cells. 200+ cancer-fighting compounds have been identified, but only one, called Plinabulin, has reached clinical testing.