( out any unexpected side effectsstate...)Diatos Announces Positive Clinical Results for its DTS-201,Doxorubicin Prodrug Program,Health

out any unexpected side effects," stated Jean-Pierre Delord, M.D., principal investigator from the anti-cancer center Claudius Regaud Institute in Toulouse, France. "In particular, no severe toxicity has been observed even after the administration of six cycles of the agent in this Phase I trial. Furthermore, we have observed some encouraging activity in normally chemo-resistant cancers."

DTS-201 was initially discovered by Pr Andre Trouet and his team at the Universite Catholique de Louvain, Belgium, and exclusive European rights were in-licensed from Medarex Inc. in April 2003 as a preclinical compound.

President and CEO of Diatos John Tchelingerian, Ph.D, added: "I am satisfied that Diatos continues to make substantial progress in its clinical development programs based on novel, targeted anti-cancer chemotherapies. The positive results from our Phase I study with DTS-201, particularly the encouraging signs of improved efficacy versus standard doxorubicin treatment, represent a significant milestone in the development of our product. Diatos is poised to initiate a Phase II study for DTS-201 in Europe soon, advancing what we believe is a next generation anthracycline for the benefit of cancer patients."

Notes to Editors:

About DTS-201

DTS-201 consists of doxorubicin, a marketed cytotoxic agent effective against a wide variety of solid tumors, conjugated to a proprietary peptide. The product was discovered in 1996 by Pr Andre Trouet and his team at the Universite Catholique de Louvain, Belgium and in-licensed from Medarex Inc in April 2003. DTS-201 is also known as Super-Leu-Dox or CPI-0004Na in the USA.

DTS-201 is a prodrug designed to preferentially deliver doxorubicin to tumors as opposed to normal tissues. It consists of the tetrapeptide N-succinyl-(beta)-alanyl-L-leucyl-L-alanyl-L-leucine covalently linked to the aminoglycoside portion of doxorubicin.

Peptide-based targeting of tumors is an attractive approach f
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