Tuesday, April 16, 2013

Embargoed news from Annals of Internal Medicine

Embargoed news from Annals of Internal Medicine [ Back to EurekAlert! ] Public release date: 15-Apr-2013
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Contact: Angela Collom
acollom@acponline.org
215-351-2653
American College of Physicians

Annals of Internal Medicine tip sheet for 16 Apr. issue

1. Task Force Reviews Evidence for New Recommendations on Medications to Reduce Risk for Primary Breast Cancer

High-risk women may derive the most benefit, least harms from preventive drug therapy

Women at high risk for breast cancer may benefit most from preventive drug therapy. In 2002, the United States Preventive Services Task Force (USPSTF) recommended against routine use of tamoxifen and raloxifene for prevention of primary breast cancer for women at average risk. The Task Force recommended that clinicians discuss the potential benefits and harms of those drugs for women at high risk before prescribing them. To update its previous recommendations, the Task Force reviewed evidence published through December 2012. In placebo-controlled trials, both tamoxifen and raloxifene reduced the incidence of invasive breast cancer over the five-year treatment period, and both medications reduced fractures. In head-to-head trials, tamoxifen had greater effect at reducing invasive breast cancer than raloxifene, but also was associated with more thromboembolic events, endometrial cancer, and related gynecologic outcomes and cataracts compared with placebo and raloxifene. The evidence showed that women at highest risk for breast cancer derived the most benefit from drug treatment. Women who received tamoxifen, raloxifene, or exemestane had a 10-year breast cancer risk of 7.5 percent compared with a 21.3 percent risk for women on no treatment. The evidence will inform an upcoming recommendation statement from the USPSTF. A link to this article will go live at 5:00 p.m. on April 15 http://www.annals.org/article.aspx?doi=10.7326/0003-4819-158-8-201304160-00005.

Note: For an embargoed PDF, please contact Angela Collom. To speak with the author please contact Elisa Williams at willieli@ohsu.edu or 503-494-4530.


2. CT Scans Obtained for Other Reasons Can be Used for Osteoporosis Screening

Abdominal computed tomography (CT) scans obtained for other clinical indications can be used to screen patients for osteoporosis. Osteoporosis is a common disease of the bones that increases risk for fracture, especially among older women. Central dual-energy x-ray absorptiometry (DXA) of the hips and lumbar spine is widely recognized as the reference standard for diagnosing osteoporosis, yet the procedure is underutilized. Nearly half of all female Medicare beneficiaries have never had a bone mineral density (BMD) test. Recognizing a need for safe and cost-effective alternatives to DXA screening, researchers sought to determine if CT scans performed for other clinical indications could be used to assess BMD. Researchers compared CT scans to DXA scans performed within 6 months of the CT for 1,867 patients over a 10-year period. They found that nearly half of patients with an osteoporotic vertebral compression fracture identified by the CT scan had been classified as having normal bone density by the DXA scan. The researchers conclude that CT scans can be used opportunistically to screen for osteoporosis without additional radiation exposure or cost. The authors of an accompanying editorial caution against adding more information to CT reports already replete with incidental findings, as only about half of incidental findings are ever acted on or confirmed. The authors suggest that CT reports linked to evidence summaries and actionable reminders that could be transmitted to primary care physicians may be a more effective way to increase the likelihood of follow up and treatment. A link to this article will go live at 5:00 p.m. on April 15 http://www.annals.org/article.aspx?doi=10.7326/0003-4819-158-8-201304160-00003.

Note: For an embargoed PDF, please contact Angela Collom. To speak with the lead author please contact Toni Morrissey at tmorrissey@uwhealth.org or 608-263-3223.


3. Computer-aided Detection Finds Invasive Breast Cancer Earlier, Increases Diagnostic Tests in Women Without Cancer

Using computer-aided detection (CAD) to assess mammograms increases diagnosis of early stage cancers, but also increases diagnostic testing for women without breast cancer. Researchers suggest these findings are likely fuel breast cancer screening debates. With CAD, radiologists use computer algorithms to mark and reassess potentially suspicious lesions that may have been missed on initial mammogram review. Despite limited evidence of its clinical effectiveness, the use of CAD in screening mammography has been broadly adopted. Researchers reviewed health records for 163,099 women aged 67 to 89 years receiving 409,459 mammograms to determine the associations between CAD use during screening mammography and the incidence of ductal carcinoma in situ (DCIS) and invasive breast cancer, invasive cancer stage, and diagnostic testing. The researchers found that use of CAD was associated with greater DCIS incidence, but found no difference in invasive breast cancer incidence. Among women with invasive cancer, use of CAD was associated with greater likelihood of detecting it in earlier stages (stages I and II vs II and IV). Use of CAD also increased diagnostic mammography, breast ultrasonography, and breast biopsy in women without cancer. A link to this article will go live at 5:00 p.m. on April 15 http://www.annals.org/article.aspx?doi=10.7326/0003-4819-158-8-201304160-00002.

Note: For an embargoed PDF, please contact Angela Collom. To speak with the lead author please contact Karen Finney at karen.finney@ucdmc.ucdavis.edu or 916-734-9064.


4. Health Outcomes Improve When Doctors Adapt Care Plans to Accommodate Individual Patient Needs

Patient-centered decision making (PCDM) leads to better health outcomes. PCDM occurs when the physician considers individual patient needs and circumstances when prescribing a care plan. For example, if a patient is unable to adhere to a thrice-daily medication regimen because of work responsibilities, modification of the plan to accommodate these circumstances would be considered PCDM. Researchers sought to determine if PCDM would affect health care outcomes compared with inattention to patient context. Researchers had 774 patients covertly audio-record encounters with their physicians. Those recordings were screened for "contextual red flags" that could affect health outcomes (e.g. missed appointments or lack of control over manageable chronic conditions).The researchers analyzed the tapes to see if the red flag surfaced during the visit and if the care plan was "contextualized" to accommodate the patient's needs. The recordings were analyzed against medical records to determine the relationship between PCDM and patient outcomes. The researchers found that health outcomes improved in 71 percent of patients whose physicians paid attention to their individual needs and circumstances compared to improvements in just 46 percent of patients whose physicians did not contextualize care plans. The author of an accompanying editorial writes that interventions to increase physician attention to patient context should focus on helping physicians link to needed services and support systems that can help them solve their patients' problems. A link to this article will go live at 5:00 p.m. on April 15 http://www.annals.org/article.aspx?doi=10.7326/0003-4819-158-8-201304160-00001.

Note: For an embargoed PDF, please contact Angela Collom. To speak with the lead author please contact Jeanne Galatzer-Levy at jgala@uic.edu or 312-996-1583.

###


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AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


Embargoed news from Annals of Internal Medicine [ Back to EurekAlert! ] Public release date: 15-Apr-2013
[ | E-mail | Share Share ]

Contact: Angela Collom
acollom@acponline.org
215-351-2653
American College of Physicians

Annals of Internal Medicine tip sheet for 16 Apr. issue

1. Task Force Reviews Evidence for New Recommendations on Medications to Reduce Risk for Primary Breast Cancer

High-risk women may derive the most benefit, least harms from preventive drug therapy

Women at high risk for breast cancer may benefit most from preventive drug therapy. In 2002, the United States Preventive Services Task Force (USPSTF) recommended against routine use of tamoxifen and raloxifene for prevention of primary breast cancer for women at average risk. The Task Force recommended that clinicians discuss the potential benefits and harms of those drugs for women at high risk before prescribing them. To update its previous recommendations, the Task Force reviewed evidence published through December 2012. In placebo-controlled trials, both tamoxifen and raloxifene reduced the incidence of invasive breast cancer over the five-year treatment period, and both medications reduced fractures. In head-to-head trials, tamoxifen had greater effect at reducing invasive breast cancer than raloxifene, but also was associated with more thromboembolic events, endometrial cancer, and related gynecologic outcomes and cataracts compared with placebo and raloxifene. The evidence showed that women at highest risk for breast cancer derived the most benefit from drug treatment. Women who received tamoxifen, raloxifene, or exemestane had a 10-year breast cancer risk of 7.5 percent compared with a 21.3 percent risk for women on no treatment. The evidence will inform an upcoming recommendation statement from the USPSTF. A link to this article will go live at 5:00 p.m. on April 15 http://www.annals.org/article.aspx?doi=10.7326/0003-4819-158-8-201304160-00005.

Note: For an embargoed PDF, please contact Angela Collom. To speak with the author please contact Elisa Williams at willieli@ohsu.edu or 503-494-4530.


2. CT Scans Obtained for Other Reasons Can be Used for Osteoporosis Screening

Abdominal computed tomography (CT) scans obtained for other clinical indications can be used to screen patients for osteoporosis. Osteoporosis is a common disease of the bones that increases risk for fracture, especially among older women. Central dual-energy x-ray absorptiometry (DXA) of the hips and lumbar spine is widely recognized as the reference standard for diagnosing osteoporosis, yet the procedure is underutilized. Nearly half of all female Medicare beneficiaries have never had a bone mineral density (BMD) test. Recognizing a need for safe and cost-effective alternatives to DXA screening, researchers sought to determine if CT scans performed for other clinical indications could be used to assess BMD. Researchers compared CT scans to DXA scans performed within 6 months of the CT for 1,867 patients over a 10-year period. They found that nearly half of patients with an osteoporotic vertebral compression fracture identified by the CT scan had been classified as having normal bone density by the DXA scan. The researchers conclude that CT scans can be used opportunistically to screen for osteoporosis without additional radiation exposure or cost. The authors of an accompanying editorial caution against adding more information to CT reports already replete with incidental findings, as only about half of incidental findings are ever acted on or confirmed. The authors suggest that CT reports linked to evidence summaries and actionable reminders that could be transmitted to primary care physicians may be a more effective way to increase the likelihood of follow up and treatment. A link to this article will go live at 5:00 p.m. on April 15 http://www.annals.org/article.aspx?doi=10.7326/0003-4819-158-8-201304160-00003.

Note: For an embargoed PDF, please contact Angela Collom. To speak with the lead author please contact Toni Morrissey at tmorrissey@uwhealth.org or 608-263-3223.


3. Computer-aided Detection Finds Invasive Breast Cancer Earlier, Increases Diagnostic Tests in Women Without Cancer

Using computer-aided detection (CAD) to assess mammograms increases diagnosis of early stage cancers, but also increases diagnostic testing for women without breast cancer. Researchers suggest these findings are likely fuel breast cancer screening debates. With CAD, radiologists use computer algorithms to mark and reassess potentially suspicious lesions that may have been missed on initial mammogram review. Despite limited evidence of its clinical effectiveness, the use of CAD in screening mammography has been broadly adopted. Researchers reviewed health records for 163,099 women aged 67 to 89 years receiving 409,459 mammograms to determine the associations between CAD use during screening mammography and the incidence of ductal carcinoma in situ (DCIS) and invasive breast cancer, invasive cancer stage, and diagnostic testing. The researchers found that use of CAD was associated with greater DCIS incidence, but found no difference in invasive breast cancer incidence. Among women with invasive cancer, use of CAD was associated with greater likelihood of detecting it in earlier stages (stages I and II vs II and IV). Use of CAD also increased diagnostic mammography, breast ultrasonography, and breast biopsy in women without cancer. A link to this article will go live at 5:00 p.m. on April 15 http://www.annals.org/article.aspx?doi=10.7326/0003-4819-158-8-201304160-00002.

Note: For an embargoed PDF, please contact Angela Collom. To speak with the lead author please contact Karen Finney at karen.finney@ucdmc.ucdavis.edu or 916-734-9064.


4. Health Outcomes Improve When Doctors Adapt Care Plans to Accommodate Individual Patient Needs

Patient-centered decision making (PCDM) leads to better health outcomes. PCDM occurs when the physician considers individual patient needs and circumstances when prescribing a care plan. For example, if a patient is unable to adhere to a thrice-daily medication regimen because of work responsibilities, modification of the plan to accommodate these circumstances would be considered PCDM. Researchers sought to determine if PCDM would affect health care outcomes compared with inattention to patient context. Researchers had 774 patients covertly audio-record encounters with their physicians. Those recordings were screened for "contextual red flags" that could affect health outcomes (e.g. missed appointments or lack of control over manageable chronic conditions).The researchers analyzed the tapes to see if the red flag surfaced during the visit and if the care plan was "contextualized" to accommodate the patient's needs. The recordings were analyzed against medical records to determine the relationship between PCDM and patient outcomes. The researchers found that health outcomes improved in 71 percent of patients whose physicians paid attention to their individual needs and circumstances compared to improvements in just 46 percent of patients whose physicians did not contextualize care plans. The author of an accompanying editorial writes that interventions to increase physician attention to patient context should focus on helping physicians link to needed services and support systems that can help them solve their patients' problems. A link to this article will go live at 5:00 p.m. on April 15 http://www.annals.org/article.aspx?doi=10.7326/0003-4819-158-8-201304160-00001.

Note: For an embargoed PDF, please contact Angela Collom. To speak with the lead author please contact Jeanne Galatzer-Levy at jgala@uic.edu or 312-996-1583.

###


[ Back to EurekAlert! ] [ | E-mail | Share Share ]

?


AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


Source: http://www.eurekalert.org/pub_releases/2013-04/acop-enf041013.php

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Monday, April 15, 2013

Nanosponges soak up toxins released by bacterial infections and venom

Apr. 14, 2013 ? Engineers at the University of California, San Diego have invented a "nanosponge" capable of safely removing a broad class of dangerous toxins from the bloodstream -- including toxins produced by MRSA, E. coli, poisonous snakes and bees. These nanosponges, which thus far have been studied in mice, can neutralize "pore-forming toxins," which destroy cells by poking holes in their cell membranes. Unlike other anti-toxin platforms that need to be custom synthesized for individual toxin type, the nanosponges can absorb different pore-forming toxins regardless of their molecular structures. In a study against alpha-haemolysin toxin from MRSA, pre-innoculation with nanosponges enabled 89 percent of mice to survive lethal doses.

Administering nanosponges after the lethal dose led to 44 percent survival.

The team, led by nanoengineers at the UC San Diego Jacobs School of Engineering, published the findings in Nature Nanotechnology April 14.

"This is a new way to remove toxins from the bloodstream," said Liangfang Zhang, a nanoengineering professor at the UC San Diego Jacobs School of Engineering and the senior author on the study. "Instead of creating specific treatments for individual toxins, we are developing a platform that can neutralize toxins caused by a wide range of pathogens, including MRSA and other antibiotic resistant bacteria," said Zhang. The work could also lead to non-species-specific therapies for venomous snake bites and bee stings, which would make it more likely that health care providers or at-risk individuals will have life-saving treatments available when they need them most.

The researchers are aiming to translate this work into approved therapies. "One of the first applications we are aiming for would be an anti-virulence treatment for MRSA. That's why we studied one of the most virulent toxins from MRSA in our experiments," said "Jack" Che-Ming Hu, the first author on the paper. Hu, now a post-doctoral researcher in Zhang's lab, earned his Ph.D. in bioengineering from UC San Diego in 2011.

Aspects of this work will be presented April 18 at Research Expo, the annual graduate student research and networking event of the UC San Diego Jacobs School of Engineering.

Nanosponges as Decoys

In order to evade the immune system and remain in circulation in the bloodstream, the nanosponges are wrapped in red blood cell membranes. This red blood cell cloaking technology was developed in Liangfang Zhang's lab at UC San Diego. The researchers previously demonstrated that nanoparticles disguised as red blood cells could be used to deliver cancer-fighting drugs directly to a tumor. Zhang also has a faculty appointment at the UC San Diego Moores Cancer Center.

Red blood cells are one of the primary targets of pore-forming toxins. When a group of toxins all puncture the same cell, forming a pore, uncontrolled ions rush in and the cell dies.

The nanosponges look like red blood cells, and therefore serve as red blood cell decoys that collect the toxins. The nanosponges absorb damaging toxins and divert them away from their cellular targets. The nanosponges had a half-life of 40 hours in the researchers' experiments in mice. Eventually the liver safely metabolized both the nanosponges and the sequestered toxins, with the liver incurring no discernible damage.

Each nanosponge has a diameter of approximately 85 nanometers and is made of a biocompatible polymer core wrapped in segments of red blood cells membranes.

Zhang's team separates the red blood cells from a small sample of blood using a centrifuge and then puts the cells into a solution that causes them to swell and burst, releasing hemoglobin and leaving RBC skins behind. The skins are then mixed with the ball-shaped nanoparticles until they are coated with a red blood cell membrane.

Just one red blood cell membrane can make thousands of nanosponges, which are 3,000 times smaller than a red blood cell. With a single dose, this army of nanosponges floods the blood stream, outnumbering red blood cells and intercepting toxins.

Based on test-tube experiments, the number of toxins each nanosponge could absorb depended on the toxin. For example, approximately 85 alpha-haemolysin toxin produced by MRSA, 30 stretpolysin-O toxins and 850 melittin monomoers, which are part of bee venom.

In mice, administering nanosponges and alpha-haemolysin toxin simultaneously at a toxin-to-nanosponge ratio of 70:1 neutralized the toxins and caused no discernible damage.

One next step, the researchers say, is to pursue clinical trials.

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Story Source:

The above story is reprinted from materials provided by University of California - San Diego, via EurekAlert!, a service of AAAS.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.


Journal Reference:

  1. Che-Ming J. Hu, Ronnie H. Fang, Jonathan Copp, Brian T. Luk, Liangfang Zhang. A biomimetic nanosponge that absorbs pore-forming toxins. Nature Nanotechnology, 2013; DOI: 10.1038/nnano.2013.54

Note: If no author is given, the source is cited instead.

Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/most_popular/~3/JCulDU1774Y/130414193435.htm

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Saturday, April 6, 2013

Tunisia frees Salafist sheikh expelled by Egypt | Morocco World News

TUNIS, April 5, 2013 (AFP)

Tunisia freed on Friday a Salafist sheikh?arrested on arrival after being expelled by Egypt for falsifying travel papers?for jihadists, saying he was not guilty, the justice ministry said.

Tunisian Imed ben Salah, also known as Abou Abdallah Ettounsi, was arrested?on March 21 and ordered out of Egypt, according to press reports, for?organising the falsification of documents to help jihadists travel to combat?zones.

??The prosecutor freed Imed ben Salah, in the absence of a crime being?committed,? ministry spokesman Adel Riahi told AFP, adding that he was freed?late on Thursday.

When Ben Salah arrived at Tunis airport earlier on Thursday, he was?arrested amid a tight security presence after radical Islamist websites called?for a big turnout to welcome him.

Police manned checkpoints around the airport to keep Salafists away from?the building, an AFP photographer reported, and armed police with dogs?patrolled the arrivals hall.

Since its January 2011 revolution, Tunisia has witnessed a proliferation of?jihadist groups, which have been blamed for a wave of deadly attacks, notably?on the US embassy in Tunis last September that left four of the assailants dead.

Tunisia?s government has warned of jihadist groups linked to Al-Qaeda?s?north African franchise infiltrating the country?s borders and trafficking?weapons, notably to northern Mali.

The judiciary opened an investigation in mid-March into a network?recruiting and sending Tunisians to fight Syrian President Bashar al-Assad?s?forces alongside Islamist insurgents.

?Tunisia?s secular opposition accuses the government, led by Prime Minister?Ali Larayedh of the Islamist Ennahda party, of having a lax attitude towards?radical Islamism.

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Source: http://www.moroccoworldnews.com/2013/04/85459/tunisia-frees-salafist-sheikh-expelled-by-egypt/

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UN says US violating international law, calls for closure of Guantanamo

Bob Strong / Reuters file

A prisoner reads a newspaper in a communal cell block at Camp VI at Guantanamo Bay prison. The UN on Friday called on the US to close the prison, accusing the country of violating international law.

By Stephanie Nebehay, Reuters

GENEVA -- The UN human rights chief called on the United States on Friday to close down the Guantanamo Bay prison camp, saying the indefinite imprisonment of many detainees without charge or trial violated international law.

Navi Pillay said the hunger strike being staged by some inmates at the Guantanamo Bay U.S. Naval Base in southeastern Cuba was a "desperate act" but "scarcely surprising."

"We must be clear about this: The United States is in clear breach not just of its own commitments but also of international laws and standards that it is obliged to uphold," the UN high commissioner for human rights said in a statement.

About half of the 166 detainees there have been cleared for transfer either to home countries or third countries for resettlement, Pillay said. "As a first step, those who have been cleared for release must be released," she said.

"Others reportedly have been designated for further indefinite detention. Some of them have been festering in this detention center for more than a decade," she said.

Of the 166 detainees, only nine have been charged with or convicted of crimes.

Forty inmates are currently staging a hunger strike to protest against their indefinite detention, according to a U.S. military spokesman at Guantanamo. Some have lost so much weight that they are being force-fed liquid nutrients.

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Copyright 2013 Thomson Reuters. Click for restrictions.

Source: http://feeds.nbcnews.com/c/35002/f/653387/s/2a613fe0/l/0Lworldnews0Bnbcnews0N0C0Inews0C20A130C0A40C0A50C176172770Eun0Esays0Eus0Eviolating0Einternational0Elaw0Ecalls0Efor0Eclosure0Eof0Eguantanamo0Dlite/story01.htm

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