Life Extension Update
Tuesday, July 3, 2012. At the American Association for Cancer Research's Pancreatic Cancer: Progress and Challenges conference, held June 18-21, 2012 in Lake Tahoe, Nevada, Christopher Heeschen, MD, PhD of the Spanish National Cancer Research Centre reported positive results for metformin in experiments involving pancreatic cancer cell cultures and mice implanted with pancreatic cancer tumors. The drug helps eliminate cancer stem cells, a population of cells that are resistant to chemotherapy and which may be responsible for the initiation and recurrence of the disease.
Metformin is currently prescribed to diabetic patients and has shown potential as a cancer preventive and treatment, in addition to other possible uses. In the current research, pretreatment of pancreatic ductal adenocarcinoma cancer stem cells with metformin resulted in activation of 5' adenosine monophosphate-activated protein kinase (AMPK), an enzyme that helps regulate cellular energy. Treatment with a combination of gemcitabine (the standard chemotherapy for pancreatic cancer) and metformin eradicated cancer stem cells as well as other malignant cells. When Dr Heeschen's team implanted immunocompromised mice with pancreatic cancer tumors and treated them with gemcitabine and/or metformin, animals that received both drugs had fewer tumors and a lower incidence of relapse in comparison with those that received either drug alone. "Intriguingly, in all tumors treated with metformin to date, relapse of disease was efficiently prevented and there were no noticeable adverse effects," remarked Dr Heeschen, who is a professor of experimental medicine at the Spanish National Cancer Research Centre in Madrid.
"As the cancer stem cells represent the root of pancreatic cancer, their extinction by reprogramming their metabolism with metformin in combination with the stalling of the proliferation of more differentiated cells should result in tumor regression and long-term, progression-free survival," he noted. "Efficiently targeting these cells will be crucial for achieving higher cure rates in patients with pancreatic cancer. Our newly emerging data now indicate that metformin, a widely used and well-tolerated drug for the treatment of diabetes, is capable of efficiently eliminating these cells."
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