PM-060184 is a new type of marine polyketide isolated from the Madagascan sponge. PM060184 belongs to a new family of tubulin-binding agents. PM060184 is an inhibitor of tubulin polymerization that reduces microtubule dynamicity in cells by 59%. Interestingly, PM060184 suppresses microtubule shortening and growing at a similar extent. PM060184 is able to overcome P-gp mediated resistance in vivo, an effect that could be related to its high binding affinity for tubulin. PM-060184 demonstrated antimitotic properties in human tumor cells lines at subnanomolar concentrations and display a distinct inhibition mechanism on microtubules. An antivascular mechanism is contributing to the antitumor activities of plocabulin. PM-060184 I in phase II clinical trial for the treatment of breast and colorectal cancer.