Navigation Links
Potential Diagnostic Marker Indicates Effectiveness of Anti-Angiogenic Drugs

If an anti-angiogenic drug is successfully starving a cancer patient’s tumor to death, the number of endothelial cells circulating in the individual’s bloodstream will decrease // , thus providing a potential biomarker for gauging the medication’s effectiveness, according to National Cancer Institute (NCI) research.

Previous studies have shown that the blood circulation of cancer patients has an abnormally high number of endothelial cells, which help construct blood vessels including those that feed the cancerous tumor.

“For a cancer to survive, grow and spread, a tumor needs to make more endothelial cells and construct new blood vessels to provide oxygen and other nutrients,” said NCI scientist Haiqing Li, Ph.D., first author of the study.

“In addition to growing them directly from nearby blood vessels, tumors can also signal the body’s bone marrow to boost the supply of endothelial cells in the blood circulation,” Li added.

Results were presented at the first international meeting on Molecular Diagnostics in Cancer Therapeutic Development, organized by the American Association for Cancer Research.

Anti-angiogenic drugs inhibit blood vessel development at the tumor by killing the endothelial cells lining tumor blood vessels and/or cutting off the supply of endothelial cells from bone marrow. These drugs are typically paired with chemotherapy agents. Unlike anti-angiogenic drugs, chemotherapy agents directly assault tumor cells, and a reliable therapeutic biomarker for evaluating these agents is whether there are fewer cells in the tumor, or more, or just the same amount as before the treatment. Some chemotherapy drugs, Li noted, also have the benefit of being toxic to endothelial cells, providing a possible second biomarker for those agents.

But biomarkers have yet to be defined for anti-angiogenic drugs. “Many anti-angiogenic drugs may encounter problems during clinical studies, because they ca n't reduce tumor size rapidly like chemotherapies can,” noted Li. “Thus, a biomarker is needed for the effectiveness of anti-angiogenic drugs in an early stage.”

The NCI study, conducted with the European Institute of Oncology (EIO), suggests that the anti-angiogenic drugs enhance chemotherapy’s ability to kill endothelial cells, as indicated by increases in dead endothelial cells circulating in the patient’s blood stream.

The NCI and EIO scientists also discovered that anti-angiogenic drugs might combat cancer by preventing immature cells in the bone marrow from developing into endothelial cells.

This research was conducted with four groups of immunodeficient mice in which human prostate cancer cells had been implanted. Each group received a different treatment: a control agent (no drug); a chemotherapy agent (docetaxel) only; an anti-angiogenic drug (thalidomide) alone; and both chemotherapy and the anti-angiogenic drugs.

Circulating endothelial cell (CEC) levels were measured before all four groups were treated and at specific times during the study. In the group receiving only chemotherapy, blood levels of dead CECs soon increased, up to 2.6 fold. In the animals treated with the two drugs, CEC death was higher – up to 4.3 fold -- suggesting that the anti-angiogenic agent may have enhanced chemotherapy’s ability to kill the tumor vascular endothelial cells.

Tests conducted later in the study revealed that treatment with the anti-angiogenic drug alone reduced the level of viable CECs by 18 percent, while treatment with only chemotherapy decreased it by 61 percent. The combination of both drugs further diminished the blood levels of viable CECs by 75 percent, indicating that the anti-angiogenic drug may have inhibited the immature endothelial cells in the bone marrow from reproducing and differentiating into adult cells.

Li is continuing her research on CECs in cancer. “We are in the process of testing whether this biomarker is exclusive for anti-angiogenic therapy,” she added. “Hopefully, the knowledge we learn pre-clinically will be translated into a useful biomarker for patients.”


Related medicine news :

1. Potential New Cancer Gene Identified
2. Lack of Smell And Its Potential Risks
3. New Blood Thinner Pill - First Potential Alternative to Warfarin in 50 years
4. The Potential Of Cadaver Transplantation Programme In India
5. Another Potential Of Stem Cells Discovered: Used For Growing Cartilage
6. Yoga Guru Ramdev Invited to Tap Ayurveda Potential by Jharkhand Govt
7. A Protein In Yoghurt Has The Potential To Fight E. coli
8. Gold Therapy- A Potential Treatment For Autoimmune Diseases
9. Whirlpool Bath Tubs Contain Potentially Lethal Bacterial Strains
10. Potential Benefits Of New Nanotechnology
11. Hormone Can Foretell Presence Of Potentially Fatal Pulmonary Hypertension
Post Your Comments:

(Date:12/1/2015)... ... December 01, 2015 , ... December 1, 2015 ... of the company’s growing product line of food safety and seafood fraud prevention ... (Oncorhynchus nerka) – allow InstantLabs to offer fast, reliable species identification for the ...
(Date:12/1/2015)... York, NY (PRWEB) , ... December 01, 2015 ... ... of non-traumatic limb amputations in the United States. Podiatrists are well aware that ... to adopt therapeutic behaviors) are often catastrophic contributors to diseases of the diabetic ...
(Date:12/1/2015)... (PRWEB) , ... December 01, 2015 , ... ... Center of Excellence (BHCOE) today announced that the organization has awarded Education and ... Francisco, with a Distinguished Award. The award celebrates exceptional special needs providers that ...
(Date:12/1/2015)... ... December 01, 2015 , ... ... Effective Post-Affiliation Integration ,” addresses a main “pain point” for merging or aligning ... results, once a deal is signed. This quick-read guidance suggests that failing ...
(Date:12/1/2015)... Beverly Hills, CA (PRWEB) , ... December 01, ... ... honored by Modern Luxury’s Angeleno Magazine as a Modern Man for 2015. ... luxury lifestyle publisher in the United States. Established in 1994, Modern Luxury includes ...
Breaking Medicine News(10 mins):
(Date:12/1/2015)... and PITTSBURGH , Dec. ... announced that it expects to be the first to ... funded by international donors, TLE400 (Tenofovir Disoproxyl Fumarate 300 ... for $99 per patient, per year. Mylan partnered with ... The significantly reduced price could generate savings of tens ...
(Date:12/1/2015)... Dec. 1, 2015  Six months of adjunctive metformin therapy ... 1 diabetes, according to new research from T1D Exchange ... may have a beneficial effect on measures of obesity, including ... of the Journal of the American Medical Association , ... effect of metformin on overweight and obese adolescents with type ...
(Date:12/1/2015)... 2015 ... of the "2016 Europe Enteric ... Coli, Enterovirus, Rhinovirus, Rotavirus, Salmonella, Shigella, ... offering. --> ) ... "2016 Europe Enteric Disease Testing ...
Breaking Medicine Technology: