Cervical vaccine also protects against anal cancer risk
A vaccine routinely used to shield against cervical cancer caused by the human papillomavirus also reduces women's risk of anal cancer, a study published by the journal The Lancet Oncology on Tuesday says.
The trial involved 4,210 healthy women aged 18-25 in Costa Rica, who were randomly assigned the human papillomavirus (HPV) vaccine Cervarix or an ordinary hepatitis A vaccine as a comparison.
Four years later, the women were tested for cervical and anal infections by the 16 and 18 types of HPV, which are notoriously associated with cancer.
Women who received Cervarix had a 76-percent lower risk of cervical infection and a 62-percent lower risk of anal infection compared with un-inoculated counterparts.
The protection was even higher in a sub-group of women who most probably had no previous exposure to HPV. In this category, the vaccine was nearly 89-percent protective against cervical infection by the two viral strains and nearly 84 percent against anal infections.
Even though anal cancer is rare -- just two cases per 100,000 people per year in the overall population, according to some estimates -- women generally have twice the incidence of this disease than men.
Why this is so is unclear, although receptive anal intercourse may be a factor.
A condition called cervical neoplasia may also predispose women to the risk of anal HPV infection, regardless of anal intercourse.
Within the general population, higher-risk groups for anal cancer are men who have sex with men. HIV-negative gays have 40 cases per 100,000 individuals per year, and HIV-infected gays 80 per 100,000.
HPV causes most anal cancers, previous research has found. Nearly four out of every five HPV-linked anal cases are caused by types 16 or 18.
In a commentary also carried by The Lancet Oncology, US specialists Diane Harper and Stephen Vierthaler of the University of Missouri-Kansas City School of Medicine, said the cost benefits of HPV vaccination for anal cancer were hazy.
The big question was how long the vaccine remained effective, they said.
"Without duration of efficacy of at least 15 years, cancers will not be prevented for women or men who have sex with men, only postponed," the pair noted.
"Efficacy trials are lacking and anal cancer incidence is rare. Let's use our resources wisely."
(c) 2011 AFP
- US approves anal cancer vaccine Dec 23, 2010 | not rated yet | 0
- Cancer-causing virus associated with higher risk of new HIV infection Apr 30, 2009 | not rated yet | 0
- Oral sex linked to cancer risk Feb 20, 2011 | not rated yet | 0
- New vaccine may provide broader protection against cervical cancer Jun 28, 2007 | not rated yet | 0
- Some men want girls' vaccine, too Feb 23, 2007 | 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 May 24, 2013 | 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 May 24, 2013 | 5 / 5 (1) | 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 May 24, 2013 | 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 May 24, 2013 | 5 / 5 (2) | 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 May 24, 2013 | 5 / 5 (4) | 0
Coenzyme Q10 decreases all cause mortality by half, according to the results of a multicentre randomised double blind trial presented today at Heart Failure 2013 congress. It is the first drug to improve heart failure mortality ...
14 hours ago | 5 / 5 (2) | 5
(HealthDay)—Animals make great companions for senior citizens, but elderly people who always drive with a pet in the car are far more likely to crash than those who never drive with a pet, researchers have ...
6 hours ago | not rated yet | 1
Heart failure accelerates the aging process and brings on early andropausal syndrome (AS), according to research presented today at the Heart Failure Congress 2013. AS, also referred to as male 'menopause', was four times ...
14 hours ago | not rated yet | 1
Mortality and length of stay are highest in heart failure patients admitted in January, on Friday, and overnight, according to research presented today at the Heart Failure Congress 2013. The analysis of nearly 1 million ...
14 hours ago | not rated yet | 0
(AP)—Department of Justice lawyers have again asked a federal appeals court in New York to delay lifting age restrictions and prescription requirements on an emergency contraceptive popularly known as the morning-after ...
14 hours ago | not rated yet | 0