( The cosmetic treatment Botox may have a...)Botox could help target resistant tumors for treatment

The study in mice, led by Bernard Gallez, Ph.D., professor of pharmacy at the Université de Louvain in Brussels, Belgium, found that by injecting Botulinum neurotoxin type A into two types of mouse tumors, the tumors' cellular vasculature opened, allowing for more effective destruction of previously resistant cancer cells. The study is the first to test the idea of using Botox against cancer and explores the possibility of its use as an adjuvant, assisting the effective delivery of chemotherapies and radiation.

The findings mark a relatively new area of cancer research, which focuses on briefly opening blood vessels that feed tumor cells in order to better deliver therapeutic agents. Until recently, much cancer research has focused on the opposite: reduction of blood vessel growth, which starves tumor cells of nutrients.

"Tumor vasculature is targeted by several advanced anti-cancer approaches that may appear contradictory," said Gallez. "Anti-angiogenesis and anti-vascular targeting are methods aimed at destroying the vessels that feed tumors, thereby depriving them of oxygen and nutrients.

"In contrast, pro-vascular approaches increase tumor perfusion and oxygenation temporarily."

While chemotherapy and radiation treatments have remained the standard of care, tumor cells of most cancer types have shown increasing resistance to therapies. This phenomenon has resulted in more toxic dosages of chemotherapy and radiation, and increased efforts to develop more drugs to which tumors don't show resistance. To increase the efficacy of anti-cancer treatments, the new study examined strategies that transiently opened the tumor vascular bed to alleviate tumor hypoxia.

"Hypoxia is a source of resistan
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Source:American Association for Cancer Research