New Trial to Evaluate Phenoxodiol as Chemo-Sensitizing Agent in Patients With Chemo-Resistant Ovarian Cancer
Marshall Edwards, Inc., has commenced a multi-center, multi-national clinical trial that will study the ability of the investigational anti-cancer drug, phenoxodiol, to restore the sensitivity of ovarian cancer to the standard chemotherapies, paclitaxel and cisplatin.
The first site to enroll patients for this study is Yale-New Haven Hospital, New Haven, Connecticut. The second enrollment site will be announced in June 2004.
Ann's NOTE: This product is a synthetic isoflavone.
Laboratory studies have shown that phenoxodiol has the ability to restore sensitivity to standard chemotherapies in ovarian cancer cells that have been obtained from women whose tumors had previously become resistant to those drugs.
Subsequent to a just-completed Phase I/II study, the prelude to this study, some women with recurrent ovarian cancers that were either resistant or refractory to standard chemotherapies such as paclitaxel, showed encouraging evidence of restoration of sensitivity to paclitaxel following phenoxodiol therapy, despite the fact that the two drugs were not used in the manner considered to be ideal in order to achieve reversal of chemo-resistance.
The new study will enroll at Yale 40 patients with recurrent, late-stage ovarian and primary peritoneal cancers that have become refractory to taxane- based (paclitaxel, docetaxol, taxotere) and/or platinum-based (cisplatin, carboplatin) drugs.
Refractory cancers are those that acquire resistance to a particular drug to the extent that the cancers grow in the face of treatment with that drug.
The two main objectives of the study are to establish the degree to which phenoxodiol reverses chemo-resistance, and to compare the relative efficacies of paclitaxel and cisplatin in combination with phenoxodiol.
The treatment regime will comprise an injection of phenoxodiol on two consecutive days, followed by a single weekly injection of paclitaxel or cisplatin immediately following the second phenoxodiol treatment.
This will be administered over a treatment cycle of 6 weeks, with cycles to be repeated until a response is obtained.
Another objective of the study is to determine the dosage of paclitaxel or cisplatin that will minimize toxicity when used in combination with phenoxodiol. The dosage of these two chemotherapies will be reduced as required until toxicity no greater than Grade 1 is achieved.
Grade 1 toxicity is the lowest of 4 levels of toxicity as defined by the National Cancer Institute's Toxicity Classification Criterion. Toxicities of Grade 3 or higher are commonly encountered with dosages of such therapies required to achieve an anti-cancer effect.
Researchers believe that phenoxodiol will restore the sensitivity of the chemo-resistant cancer cells to the extent that paclitaxel and cisplatin can achieve a significant anti-cancer effect with only minimal side-effects.
The primary clinical end-points being sought are a reduction in tumor mass and blood levels of tumor markers (CA 125 and CA19.9), and an improvement in clinical status and survival at 6 and 12 months.
Phenoxodiol reverses chemo-resistance through its ability to degrade anti- apoptotic proteins such as XIAP and c-FLIP that serve to block the ability of tumor cells to undergo apoptosis via the Fas death receptors.
Phenoxodiol is an investigational drug and, as such, is not marketed in the United States.
Phenoxodiol is an investigational anti-cancer drug developed by pharmaceutical company Marshall Edwards, Inc., which manages its international research and development programs using the expertise and clinical research capabilities of universities and hospitals in the U.S., Australia and Europe.
Marshall Edwards, Inc., has licensed rights to bring phenoxodiol to market globally from its parent company, Novogen Limited. (NASDAQ:NVGN). Novogen is developing a range of therapeutics across the fields of oncology, cardiovascular disease and inflammatory diseases based on its phenolic drug technology platform.
More information on phenoxodiol and on the Novogen group of companies can be found at www.marshalledwardsinc.com and www.novogen.com.
Source: Marshall Edwards, Inc.
WASHINGTON, April 21 /PRNewswire-FirstCall/
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