Abstract: An Eastern Indian Ocean marine sponge in the genus Spongia was located in the Republic of the Maldives and found to contain a structurally unprecedented macrocyclic lactone named spongistatin 1. The new perhydropyran-containing structure, as shown below, was found to be remarkably potent and specific, log molar TCI.sub.50 to <-10, against twenty human cancer cell lines in the U.S. National Cancer Institute's panel of sixty.

Abstract: A Southwest Indian Ocean marine sponge Spirastrella spinispirulifera (bri colored reds and purples) has been found to contain new and exceptionally active cell (human cancer) growth inhibitors spongistatin 5, spongistatin 7, spongistatin 8 and spongistatin 9. These compositions are related to spongistatin 1, which was found in a black Spongia sp. in the Porifera family. A method of treating human cancer cells with spongistatin 5 and spongistatin 7 is also disclosed.

Abstract: A black Spongia sp. in the Porifera class Demospongiae has been found to contain two new and exceptionally active cell (human cancer) growth inhibitors named spongistatin 2 and spongistatin 3. A bright colored Southwest Indian Ocean sponge Spirastrella spinispirulifera has also been found to contain related human cancer cell growth inhibitors named spongistatin 4 and spongistatin 6. A method of treating human cancer cells with spongistatin 1, spongistatin 2, spongistatin 3, spongistatin 4 and spongistatin 6 is also disclosed. The approximate mean GI.sub.50 of the disclosed compounds in the NCI cell line panel is about 10.sup.-10 .mu.g/ml.

Abstract: A new cytostatic depsipeptide, designated "dolastatin 14", was isolated from the Indian Ocean shell-less mollusk Dolabella auricularia. Dolastatin 14 inhibited growth of the PS leukemia with ED.sub.50 0.0018 .mu.g/mL. Pharmaceutical preparations and therapeutic regimens utilizing Dolastatin 14, its synthetic counterpart and pharmaceutically active derivatives are disclosed.

Abstract: New and exceptionally potent antineoplastic agents denominated Bryostatin 9, Bryostatin 10, Bryostatin 11, Bryostatin 12 and Bryostatin 13 have been isolated from the marine animal Bugula neritina (Linneaeus) (Bryozoan phylum) and the structures identified. Meaningful antineoplastic activity is found for each.

Abstract: A potent cell growth inhibitory substance obtained from the Indian Ocean sea hare Dolabella, herein denominated "dolastatin 10"; and pharmaceutical preparations containing same; and methods useful for the treatment of a host afflicted with neoplastic disease therewith.

Abstract: New and potent antineoplastic agents designated bryostatin 4, bryostatin 5, bryostatin 6, bryostatin 7, and bryostatin 8 have been isolated from the marine animal Bugula neritina L. and Amatnea convoluta (Bryozoan phylum).

Abstract: New and exceptionally potent antineoplastic agents designated bryostatin 1, bryostatin 2 and bryostatin 3 have been isolated from the marine animal Bugula neritina L. (Bryozoan phylum). An x-ray crystallographic analysis led to the assignment of novel structures shown in Charts I, II and III.