Of course, on Monday this week, it was announced and reported here that Onconase had failed the primary objective of its late-stage trial. This news was particularly disappointing since the drug already has orphan drug status in the U.S., Europe and Australia due to the very high hopes for its success. Despite failing in its primary objective, however, testing did show that the drug is effective in a secondary effect, helping to prolong the life of those treated after standard chemotherapy has failed.

The report of Onconase’s initial failure prompted WTN’s Clark to revisit Quintessence to find out if the Onconase failure would derail the development of their QBI-139. In his new report, Clarks says he found researchers undaunted and pressing forward. He says they hope to move the drug into clinical trials sometime this summer, and they believe the success of Onconase’s secondary role and hopeful FDA approval in that area will help pave the way for general acceptance of RNase cancer therapies.

In his earlier report, Clark pointed out that QBI-139 has several differences from Onconase in the way it is produced, which he believes will make it inherently more effective than Onconase.

He points out that mesothelioma is a particularly difficult cancer to treat, and wonders if the selection of mesothelioma as a research track by Alfacell was made to help fast-track the development of the drug. Perhaps, he wonders, the drug might be more effective on “more common and easier to treat cancers than mesothelioma.”

SOURCE: myMeso › Quintessence continues with mesothelioma drug

This week, I found a story that provides even more hope. It seems a Madison, Wisconsin-based biotech firm, Quintessence Bioscience, also has a promising mesothelioma drug in the works that operates along the same lines as ONCONASE, tagged QBI-139. The Quintessence drug is not yet in clinical trials.

Both drugs target RNA in cancer cells. They are therapeutic ribonucleases (RNases), which WTN News (Wisconsin Technology News) writer Steve Clark describes as “ubiquitous enzymes that destroy RNA.” He explains that researchers including the University of Wisconsin-Madison’s Ronald Raines, “discovered that RNases from non-human species sometimes are not regulated inside human cells and can cause cell death. Surprisingly, cancer cells are much more susceptible than normal cells to foreign RNases.”

The ONCONASE product is made from purified frog eggs. The Quintessence drug is 95 percent human, but still kills human cancer cells, Clark reports. Both drugs can kill a wide range of different human cancer types, he says, so its application has broad potential. The ONCONASE clinical trial data is from patients with malignant mesothelioma.

Clark reports that Quintessence is optimistic about its QBI-139 surpassing the positive results of ONCONASE. He says that frog-derived ONCONASE has been shown to cause allergic reactions in some patients, which would be mitigated in the 95 percent human-gene QBI-139. Additionally, he reports QBI-139 is less toxic than ONCONASE, which will allow it to be better tolerated by some patients in larger doses.

Currently, Clark reports, QBI-139 is being produced for use in a Phase I clinical trial, which is set to begin this summer and end sometime in 2009. It is anticipated that the trial will be held at the University of Wisconsin Carbone Cancer Center.

Read the full article at WTN News.

Steve Clark, Ph.D., is a former professor and medical researcher at the University of Wisconsin School of Medicine and Public Health, and is currently a freelance writer and consultant on biotechnology issues.

SOURCE: myMeso › New mesothelioma drug being developed