Response rate high for some patients with metastatic melanoma treated with vemurafenib
An international team of researchers from the United States and Australia, including researchers at Moffitt Cancer Center in Tampa, Fla., have found that the oral BRAF inhibitor vemurafenib (PLX4032) when tested in a phase II clinical trial offered a high rate of response in patients with previously treated metastatic melanoma and who had the BRAF mutation. More than 50 percent of the patients in the trial had positive, prolonged responses and a median survival of almost 16 months.
The study was published in a recent issue of the New England Journal of Medicine.
According to study co-author Jeffrey S. Weber, M.D., Ph.D., director of the Donald A. Adam Comprehensive Melanoma Research Center at Moffitt, approximately 50 percent of melanomas harbor the activating (V600) mutation threonine protein kinase B-RAF. Unfortunately, treatment options for these patients are "limited."
The BRAF inhibitor vemurafenib had been found effective in phase I and phase III trials. However, to determine the overall response rate in previously treated stage IV melanoma patients, the researchers designed a multi-center, phase II trial with 132 patients with previously treated BRAF V600-mutant metastatic melanoma. The trial was designed by senior academic authors and representatives of the trial sponsor, Hoffman-La Roche, and was open to adults over the age of 18 with histologically proven stage IV melanoma, progressive disease, and at least one prior systemic treatment.
"Few patients with metastatic melanoma bearing the BRAF V600 mutation have a response to systemic chemotherapies," said Weber. "Additionally, most have a median survival of only six to 10 months. However, this study yielded an overall response rate of 56 percent and a median survival of nearly 16 months."
The 56 percent response rate for this study was higher than the response rates reported on studies with other therapies for a majority of patients, such as the monoclonal antibody impilimumab. Once more, the response for patients in the vemurafenib phase II trial was "rapid," said the study authors, with less than 15 percent of patients having had disease progression at their first evaluation.
"This trial showed that vemurafenib has clinically evident anti-tumor activity in metastatic melanoma, and that response rates are higher than those associated with previously used treatments," concluded Weber.
The authors reported that toxic effects were common, but not severe or life-threatening in most cases. They added that, as with most targeted therapies that block a driver oconogene, cancer cells can develop resistance with continued dosing and the molecular mechanisms of vemurafenib are "under investigation" at Moffitt by Keiran S. Smalley, Ph.D., and at other institutions to answer questions about resistance.
Provided by H. Lee Moffitt Cancer Center & Research Institute
- New drug, Vemurafenib, doubles survival of metastatic melanoma patients Mar 01, 2012 | not rated yet | 0
- New melanoma drug Zelboraf nearly doubles survival in majority of patients Feb 22, 2012 | not rated yet | 0
- New drug for metastatic melanoma shows promising results in clinical trial Nov 11, 2010 | not rated yet | 0
- Researchers find potential solution to melanoma's resistance to vemurafenib Feb 28, 2012 | not rated yet | 0
- Melanoma drug shrinks brain metastases in phase I/II study Oct 12, 2010 | not rated yet | 0
- Motion perception revisited: High Phi effect challenges established motion perception assumptions Apr 23, 2013 | 3 / 5 (2) | 2
- Anything you can do I can do better: Neuromolecular foundations of the superiority illusion (Update) Apr 02, 2013 | 4.5 / 5 (11) | 5
- The visual system as economist: Neural resource allocation in visual adaptation Mar 30, 2013 | 5 / 5 (2) | 9
- Separate lives: Neuronal and organismal lifespans decoupled Mar 27, 2013 | 4.9 / 5 (8) | 0
- Sizing things up: The evolutionary neurobiology of scale invariance Feb 28, 2013 | 4.8 / 5 (10) | 14
Why is zone 1 in liver more prone to ischemic injury?
May 23, 2013 Hi, Is it because around central vein, there is only deoxygenated blood from the vein where as in the periphery there is hepatic artery. Also why...
How can there be villous adenoma in colon, if there are no villi there
May 22, 2013 As title suggest. Thanks :smile:
How can there be a term called "intestinal metaplasia" of stomach
May 21, 2013 Hello everyone, Ok Stomach's normal epithelium is simple columnar, now in intestinal type of adenocarcinoma of stomach it undergoes "intestinal...
Pressure-volume curve: Elastic Recoil Pressure don't make sense
May 18, 2013 From pressure-volume curve of the lung and chest wall (attached photo), I don't understand why would the elastic recoil pressure of the lung is...
If you became brain-dead, would you want them to pull the plug?
May 17, 2013 I'd want the rest of me to stay alive. Sure it's a lousy way to live but it beats being all-the-way dead. Maybe if I make it 20 years they'll...
MRI bill question
May 15, 2013 Dear PFers, The hospital gave us a $12k bill for one MRI (head with contrast). The people I talked to at the hospital tell me that they do not...
- More from Physics Forums - Medical Sciences
More news stories
In recent years, microRNAs (miRNAs) and other non-coding RNAs are small molecules that help control the expression of specific proteins. In recent years they have emerged as disease biomarkers. miRNA profiles have been used ...
Cancer 2 hours ago | not rated yet | 0
Cancer cells spread and grow by avoiding detection and destruction by the immune system. Stimulation of the immune system can help to eliminate cancer cells; however, there are many factors that cause the immune system to ...
Cancer 2 hours ago | not rated yet | 0
Researchers from London's Kingston University have begun a two-year study which could help prolong the lives of people with colorectal tumours.
Cancer 5 hours ago | 5 / 5 (1) | 0
Transformative research from Western University has identified new hormones in the body which may suppress breast cancer and stimulate the regression of breast tumors.
Cancer 6 hours ago | 5 / 5 (1) | 0
(Medical Xpress)—Curtin University researchers have found evidence that targeting specific cells in the body can reverse the effects of cancer on the immune system.
Cancer 6 hours ago | 5 / 5 (3) | 0
Two mutations central to the development of infantile myofibromatosis (IM)—a disorder characterized by multiple tumors involving the skin, bone, and soft tissue—may provide new therapeutic targets, according to researchers ...
36 minutes ago | not rated yet | 0 |
Talking on a hands-free device while behind the wheel can lead to a sharp increase in errors that could imperil other drivers on the road, according to new research from the University of Alberta.
4 minutes ago | not rated yet | 0
(AP)—Government health officials are investigating several health problems reported with potentially contaminated medications made by a Tennessee specialty pharmacy.
30 minutes ago | not rated yet | 0
(Medical Xpress)—A new study by researchers in the US has shown that an ancient virus can be modified to help in the fight against the simian immunodeficiency virus SIV, which is the equivalent in monkeys ...
6 hours ago | 5 / 5 (3) | 0 |
Women at a particular stage in their monthly menstrual cycle may be more vulnerable to some of the psychological side-effects associated with stressful experiences, according to a study from UCL.
3 hours ago | 5 / 5 (1) | 0 |
Biological processes are generally based on events at the molecular and cellular level. To understand what happens in the course of infections, diseases or normal bodily functions, scientists would need to ...
3 hours ago | 5 / 5 (2) | 0 |