MedicalResearch.com Interview with:
Cary P. Gross MD
Professor of General Medicine, of Epidemiology (Chronic Diseases) and of Faculty of Arts and Sciences
Yale...
MedicalResearch.com Interview with:
Bryan B. Shapiro
Harold Simmons Center for Kidney Disease Research and Epidemiology and
Division of Nephrology and Hypertension
Los Angeles Biomedical Research Institute
Harbor–UCLA Medical Center Torrance, California
Medical Research: What is the background for this study? What are the main findings?
Response: The inverse relationship between body mass index (BMI) and mortality rates is well-documented in maintenance hemodialysis (MHD) patients. Virtually everyone has assumed that this relationship reflects the effect of body weight, and especially fat mass, on mortality in these patients. However, height is also a component of the BMI equation (BMI = body weight (kg)/height (m²)) and may be independently associated with mortality in MHD patients. The results of this study, which examined 117, 644 MHD patients and was controlled for many demographic and laboratory variables, indicate that height, adjusted for body weight, is directly associated with mortality in a manner that is opposite to the weight-mortality relationship. Moreover, we found that the contribution of height to the inverse BMI-mortality relationship in dialysis is essentially as great as the contribution of weight. (more…)
MedicalResearch.com Interview with:
Emily Finlayson, MD, MS
Department of Surgery, Division of General Surgery
Department of Medicine, Division of Geriatrics
Philip R Lee Institute for Health Policy
University of California, San Francisco
Director, UCSF Center for Surgery in Older Adults
Medical Research: What is the background for this study? What are the main findings?
Dr. Finlayson: In general, the goal of lower extremity revascularization is to preserve the leg so that patients can maintain the ability to ambulate and maintain functional independence. We evaluated the results of this operation in older nursing home residents in the United States. We found that over the 3 year study period, over 10,000 nursing home residents underwent this procedure. Most of them were functionally dependent before surgery, 3/4 were unable to walk, and over half had dementia.
After 1 year, half of the residents had died. Among residents who could not walk before surgery, 89% were dead or non ambulatory 1 year after surgery.
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MedicalResearch.com Interview with:
Dr. Joseph Bosco MD III
Orthopedic Surgery
The New York University Langone Medical Center
Medical Research: What is the background for...
MedicalResearch.com Interview with:
Kimberly Gudzune, MD, MPH
Assistant Professor; The Johns Hopkins University School of Medicine
Core Faculty; Welch Center for Prevention, Epidemiology, and Clinical Research
The Johns Hopkins Digestive Weight Loss Center
Medical Research: What is the background for this study? What are the main findings?
Dr.Gudzune: Changes in healthcare policy may encourage healthcare providers to screen their patients for obesity, so it is critical to then have a weight management plan if obesity is identified. Recent guidelines recommend that clinicians consider referring patients to high intensity weight loss programs. Commercial weight loss programs may be one of the options available, so providers need to know which programs help people lose weight and keep it off.
We found that only 11 out of 32 programs that we looked at had rigorous studies reporting on weight loss, which means that we do not know whether most programs work. Several well-known commercial programs have been scientifically tested and two programs, Weight Watchers and Jenny Craig, achieved significant weight loss that was sustained 12 months later.
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MedicalResearch.com Interview with: Dr. Reshma Jagsi MD, DPhil
Associate Professor and Deputy Chair for Faculty and Financial Operations in the Department of Radiation Oncology at the University of Michigan Health System
Research Investigator at the Center for Bioethics and Social Sciences in Medicine
University of Michigan
Medical Research: What is the background for this study? What are the main findings?
Dr. Jagsi: We surveyed women diagnosed with breast cancer and found that many women were concerned about the genetic risk of developing other cancers themselves or of a loved one developing cancer. Overall, 35 percent of the women we studied expressed a strong desire for genetic testing, but 43 percent of those did not have a relevant discussion with a health care professional. In addition, minority patients with a strong desire for testing were less likely to discuss it with a professional, even though studies show that minority patients are not at lower risk for these mutations.
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MedicalResearch.com Interview with:
Anthony Delitto, PT, Ph.D, FAPTA
Professor and Chair
Department of Physical Therapy
Associate Dean for Research, SHRS
School of Health and Rehabilitation Sciences
University of Pittsburgh
Medical Research: What is the background for this study? What are the main findings?
Dr. Delitto: I work with a team, many of whom were authors on the paper, and we see a lot of patients with lumbar spinal stenosis. Some of them did very well with Physical Therapy and avoided surgery. Some people didn’t do well and we ended up having surgery. We really wanted to do a study that compared, in a randomized format, doing surgery vs. a non-surgical approach to lumbar spinal stenosis. The idea we had was to really put the two approaches head to head – a randomized trial of surgery vs. physical therapy for people with lumbar spinal stenosis. We decided only to recruit patients after they had consented to surgery in order to avoid the pitfalls of previous studies where people crossed over after being assigned to a group, for example, being assigned to surgery and then deciding against having surgery.
Medical Research: What should clinicians and patients take away from your report?Dr. Delitto: Probably the biggest point to put across to physicians, patients and practitioners, one of the things we realized was: patients don’t exhaust all of their non-surgical options before they consent to surgery. And physical therapy is one of the non-surgical options. The obvious finding is, when you compare the two groups, they seem to do the same. The results were equivalent at two years. Now, embedded in that, there are patients who did well in surgery, and patients who failed in surgery. There are patients who did well in Physical Therapy, and there are patients who failed with PT. But when we looked across the board at all of those groups, their success and failure rates were about the same. So it tells us that for the most part there were equivalent outcomes at two years.
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MedicalResearch.com Interview with:
Holly Gooding, MD, MS
Harvard T.H. Chan School of Public Health
Instructor in Pediatrics at Harvard Medical School
Division of Adolescent/Young Adult Medicine, Boston Children’s Hospital Division of General Internal Medicine
Brigham and Women’s Hospital Boston, MA
Medical Research: What is the background for this study? What are the main findings?
Dr. Gooding: As an adolescent medicine physician, I primarily care for patients between the ages of 12 and 30, although I first trained in internal medicine. One of the things I noticed when I started working with this age group is that pediatric and adult guidelines differ for many conditions. Cholesterol treatment is one condition that comes up frequently, because the NHLBI and the AAP recommend screening youth ages 17 to 21 for cholesterol problems.
The study team and I set out to discover the proportion of American youth ages 17 to 21 who would meet criteria for pharmacologic treatment of abnormal cholesterol levels if clinicians applied the pediatric versus the adult guidelines. We found that 2.6% of young people ages 17 to 21 would qualify for pharmacologic treatment of abnormal LDL cholesterol levels under the pediatric guidelines, but less than 1% would qualify under the adult guidelines. This translates to almost 500,000 youth qualifying for treatment under the pediatric guidelines, but only about 78,000 under the adult guidelines. Those who met pediatric criteria had lower LDL levels but higher proportions of high blood pressure, smoking, and obesity.
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MedicalResearch.com Interview with:
Dr. Mark Roschewski, MD and Dr Wyndham H Wilson MD-PhD
Lymphoma Therapeutics Section
Lymphoid Malignancies Branch, Center for Cancer Research
National Cancer Institute, National Institutes of Health
Bethesda, MD 20892
Medical Research: What is the background for this study? What are the main findings?
Response: Monitoring patients with diffuse large B-cell lymphoma (DLBCL) has relied on computed tomography (CT) scans which are imprecise, expensive and include radiation. We investigated the ability of a blood-based assay to monitor patients with DLBCL during and after their initial therapy. The assay we studied amplifies and quantifies small amounts of circulating tumor DNA from the patient’s blood. We showed that this assay effectively predicts which patients will relapse and identifies recurrence 3.5 months before CT scans.
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MedicalResearch.com Interview with:
Hannah Arem, MHS, PhD
Division of Cancer Epidemiology and Genetics
National Cancer Institute, Bethesda, Maryland
Medical Research: What is the background for this study?
Dr. Arem: The 2008 Physical Activity Guidelines for Americans recommend a minimum of 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity activity per week for “substantial” health benefit, and suggest “additional” benefit with more than double the exercise minimum. However, the guidelines note that there is a lack of evidence for an upper limit of health benefit. We set out to define the dose-response relationship between leisure-time physical activity and mortality and to determine the upper limit of benefit associated with higher levels of aerobic exercise.
Medical Research: What are the main findings?
Dr. Arem: We found that study participants who met the recommended minimum level of leisure-time physical activity derived most of the mortality benefit, with a 31% lower risk of death compared to inactive individuals. Study participants who engaged in three to five times the recommended minimum level of leisure-time physical activity had a marginally increased mortality benefit, with a 39% lower risk of death compared to inactive individuals. Three to five times the recommended minimum is equivalent to a weekly minimum of walking 7 hours or running 2 hours 15 minutes.
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MedicalResearch.com Interview with:
Marya Viorst Gwadz, Ph.D
Senior Research Scientist Director,
Transdisciplinary Methods Core
Center for Drug Use and HIV Research (CDUHR)
New York University College of Nursing
New York, NY 10010Medical Research: What is the background for this study?
Dr. Gwadz: HIV is a major success story in that the tolerability, convenience, and efficacy of antiretroviral medications have improved dramatically over the last decade. A number of years ago in the course of another research study with vulnerable individuals infected with HIV in New York City, and we noticed that a substantial proportion of study participants were medically eligible for HIV medications, and had access to medications, but had declined or stopped taking them. We then turned our attention to understanding why this is the case, that is, to identify the individual, social, and structural barriers that persons living with HIV/AIDS (PLHA) experience to antiretroviral therapy. We focused in particular on African American/Black and Latino/Hispanic PLHA, because the overall emphasis of our research group at the NYU College of Nursing is the development and evaluation of culturally targeted intervention approaches to address health disparities. Around 2011, studies of the “HIV cascade of care” began to emerge, which highlighted the problem of poor engagement in HIV care and antiretroviral therapy nationally. The ultimate goal of HIV treatment is viral suppression, but at present, the Centers for Disease Control and Prevention (CDC) estimates that we have achieved that goal with only 30% of PLHA.
Medical Research: What kind of intervention approach that emerged from these background findings?Dr. Gwadz: We found that barriers to HIV medication are complex and multi-faceted for PLHA from African American/Black and Latino/Hispanic backgrounds. In particular, PLHA experience serious emotional barriers to the uptake of HIV medications, such as fear of side effects, stigma, and disclosure of HIV status. Further, high rates of substance use and mental health distress, and barriers to accessing services for these concerns, impede medication uptake. Moreover, PLHA who are wary of HIV medication tend to avoid HIV primary care, often because they do not want to feel pressured to take medications, or explain to their providers why they are not taking them. So poor engagement in HIV care, which is very common among PLHA, and low uptake of HIV medication are actually related problems.
With funding from the National Institute of Mental Health (grant #R34MH093352), and in collaboration with Mount Sinai Beth Israel and Mount Sinai St. Luke’s-Roosevelt Hospital Center, we developed a multi-component culturally targeted intervention grounded in the Motivational Interviewing approach that included three individual sessions, 12-24 weeks of patient navigation (as needed), up to five support groups with other PLHA who had declined medication, which were co-led by a “successful” peer who was engaged in HIV care and were taking HIV medication with good adherence. One novel aspect of the intervention was its focus on emotional barriers to HIV medication, and the program’s “no pressure, no judgment” stance, congruent with the Motivational Interviewing approach, was key to engaging participants into the study to talk about these difficult issues.
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MedicalResearch.com Interview with:
Trever G. Bivona MD PhD
Assistant Professor, Hematology and Oncology
UCSFMedical Research: What is the background for this study? What are the main findings?
Dr. Bivona: Resistance to targeted cancer therapy remains a problem in the treatment of cancer patients. These targeted drugs are often effective at shrinking the tumor, but do so incompletely. This incomplete response results in residual disease that is drug resistant and eventually grows to cause relapse that is lethal in patients. We investigated the mechanisms underlying this residual disease state in lung cancers treated with the EGFR targeted therapy Tarceva. We discovered that the tumor cells survival initial EGFR targeted therapy treatment by activating a signaling pathway called NF-kappa B. This NF-kappa B pathway then promotes tumor cell survival, residual disease, and eventual relapse in the lung cancer models we studied.
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MedicalResearch.com Interview with:
Dr Richard Forshee PhDAssociate Director for Research in the Office of Biostatistics and Epidemiology Center for Biologics Evaluation and Research
U.S. Food and Drug Administration
Silver Spring, MD
On behalf of the study authorsMedical Research: What is the background for this study? What are the main findings?
Dr. Forshee: Influenza continues to be a major public health concern causing illness, hospitalization, and death. The elderly are at highest risk for seasonal influenza complications, including hospitalization and death. As people grow older their ability to raise a strong protective immune response can weaken. The availability of a vaccine that uses a higher dose to induce a stronger immune response could reduce the serious impact of influenza in this age group. The purpose of this study was to determine whether a high-dose inactivated influenza vaccine was more effective for prevention of probable influenza infections and influenza-related hospital admissions, compared to standard-dose inactivated influenza recipients.
In December 2009, the U.S. Food and Drug Administration (FDA) licensed Fluzone High Dose, an injectable inactivated trivalent seasonal influenza vaccine for people ages 65 years and older. This high-dose vaccine contains four times more hemagglutinin—the active ingredient in influenza vaccines that cause the human body to produce antibodies against the influenza viruses—than the standard-dose vaccine. The FDA approved the high-dose vaccine using the accelerated approval regulatory pathway, which allows the agency to approve products for serious or life-threatening diseases based on reasonable evidence of a product’s effectiveness. This pathway reduces the time it takes for needed medical products to become available to the public. Studies conducted prior to licensure showed an enhanced immune response to the high-dose vaccine compared with the standard-dose vaccine in individuals 65 years of age and older indicating that the high-dose vaccine was reasonably likely to be more effective in preventing influenza disease.
As part of the accelerated approval process, the manufacturer, Sanofi Pasteur, was required to conduct a randomized clinical study post-licensure to confirm that the high-dose vaccine decreased seasonal influenza disease after vaccination relative to standard dose vaccine. This confirmatory study demonstrated that the high–dose vaccine prevented 24% more cases of laboratory-confirmed influenza illness compared to standard-dose vaccines in people 65 years of age and older. However, the study was not large enough to determine efficacy of the vaccine against severe disease.
A team of scientists from FDA, the Centers for Disease Control and Prevention, Centers for Medicare and Medicaid Services, and Acumen LLC ( an independent research organization) studied the relative effectiveness of the high-dose influenza vaccine in the U.S. population ages 65 years and older. The observational study, which covered the 2012-2013 influenza season, found a significant reduction both in influenza-associated illness and in influenza-related hospitalizations among individuals who received the high-dose vaccine, compared to those receiving the standard dose.
Additional background about this study: “Comparative effectiveness of high-dose versus standard-dose influenza vaccines in US residents aged 65 years and older from 2012 to 2013 using Medicare data: a retrospective cohort analysis” is available at:
http://dx.doi.org/10.1016/S1473-3099(14)71087-4
A commentary on the study titled “Novel observational study designs with new influenza vaccines” is available at:
http://dx.doi.org/10.1016/S1473-3099(15)70020-4(more…)
MedicalResearch.com Interview with: Alka Mansukhani Ph.D.
Associate Professor
Department of Microbiology
Member of the Laura and Isaac Perlmutter Cancer Center
NYU Langone Medical Center
Medical Research: What is the background for this study? What are the main findings?
Dr. Mansukhani: Osteosarcoma is a highly aggressive pediatric bone cancer that is almost always advanced at diagnosis. Treatment outcomes have not improved in three decades and 40% of patients eventually succumb to the disease. A few years ago we identified that normal bone stem cells relied on the function of a gene called Sox2 to remain immature an self-renew. We went on to find that osteosarcoma cancer stem cells, that arise from immature bone cells, express high levels of Sox2. Like their normal counterparts, these cancer cells also need Sox2. Sox2 maintains the stemness properties of the cancer cells as well as their ability to form tumors in mice. Depleting Sox2 resulted in cells that had reduced tumor-forming potential and instead, were able to become mature bone cells.
http://www.stbaldricks.org/blog/post/new-discovery-may-hold-the-key-to-destroying-osteosarcoma/
In this new study we have identified the mechanism by which Sox2 maintains the properties of osteosarcoma cancer stem cells. Sox2 inactivates the growth restraining function of the well-known tumor suppressive hippo pathway. Hippo signaling restrains the activity of a potent oncogene, YAP. In the osteosarcoma stem cells, Sox2 directly represses two genes (Nf2 and WWC1) in the hippo pathway and thereby unleashes the growth promoting activity of YAP. Like Sox2, YAP is required to maintain the tumorigenic properties of osteosarcoma cells.
Consistently, we found high YAP and low NF2 and WWC1 expression in human osteosarcoma tissues. Our study makes a direct connection between Sox2 and repression of hippo signaling to enable YAP activity in osteosarcomas. This mechanism also operates in glioblastoma, an aggressive brain tumor.
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MedicalResearch.com Interview with:
Caitriona Ryan, MD
Baylor University Medical Center, Dallas
MedicalResearch: What is the background for this study? What are the main findings?
Dr. Ryan: Psoriasis is a common, chronic, inflammatory disorder of the skin which has a considerable impact on social functioning and personal relationships. Genital involvement can have devastating psychosexual implications for psoriasis patients. In a study examining the stigmatization experience in psoriasis patients, involvement of the genitalia was found to be the most relevant, regardless of the overall psoriasis severity. Although sexual function is an integral component of quality of life, dermatology-specific and psoriasis-specific scales largely neglect the impact of disease on sexual health. Despite major advances in other aspects of psoriasis research, there has been little emphasis in recent times on the identification and treatment of genital psoriasis and few studies have examined predisposing risk factors, phenotypical associations or its impact on quality of life and sexual functioning.
This study was designed to examine the prevalence and nature of genital involvement in patients with psoriasis, to ascertain risk factors for the development of genital psoriasis, to determine the impact of genital disease on quality of life and sexual functioning, and to assess patient satisfaction with current topical treatments for genital psoriasis.(more…)
MedicalResearch.com Interview with:
Lyn McDivitt Duncan, MD
Professor of Pathology, Harvard Medical School
Chief, Dermatopathology Unit and
Su Luo, MD Dermatology Resident
Massachusetts General Hospital
Boston, MA 02114Medical Research: What is the background for this study? What are the main findings?
Response: We studied 475 patients with cutaneous melanoma diagnosed at the Massachusetts General Hospital (MGH) who also had a sentinel lymph node biopsy procedure performed. There is a practice gap in the sentinel lymph node biopsy procedure ranging from removal of one “sentinel” lymph node to removing the hottest lymph node and any lymph nodes with radioactive tracer of 10% or more of the hottest lymph node’s counts (with an average of three lymph nodes removed). At the MGH we use this latter method. We examined the sentinel lymph nodes in each case to determine whether the positive cases with microscopic melanoma metastases had metastases only in the most radioactive, or "hottest", node or whether tumor was also present in the less hot nodes. We found that in 19% of positive cases there were metastases present only in the less hot nodes. We also performed survival analysis and showed that the less hot nodal positive cases are of equivalent prognostic significance. We found that removal of only the hottest lymph node would have led to under-staging of 19% of patients with melanoma.
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MedicalResearch.com Interview with:Bonny Rockette-Wagner, Ph.D.
Director of physical activity assessment,
University of Pittsburgh Graduate School of Public Health and
Andrea Kriska, Ph.D.
Professor of epidemiology, University of Pittsburgh
Graduate School of Public Health
Researchers’ Note:
Drs. Kriska and Rockette-Wagner: It should be noted that this study looked at adults at high risk for diabetes. Not everyone in the general population would be at high risk. We would hypothesis that the risk increase from TV watching may be lower in those not at high risk for diabetes, but obviously could not test that in our study population.MedicalResearch: What is the background for this study? Response: In this research effort focused on participants in the Diabetes Prevention Program (DPP) study (published in 2002 and funded by the National Institute of Digestive and Diabetes and Kidney Diseases [NIDDK] section of the US National Institutes of Health [NIH]). That study enrolled 3,234 overweight US adults (1996–1999) of at least 25 years of age with the goal of delaying or preventing type 2 diabetes in high risk individuals with either a metformin drug or lifestyle intervention. The DPP demonstrated that the lifestyle intervention was successful at reducing the incidence of diabetes and achieving its goals of 150 minutes per week of moderate intensity activity (such as brisk walking) and a 7% weight loss (New England Journal of Medicine, 2002). There was no goal to reduce sitting in the Diabetes Prevention Program.
Results from other studies suggest that it is unclear if interventions focusing on increasing physical activity also reduce time spent sitting. This current investigation examined whether the Diabetes Prevention Program lifestyle intervention, which was shown to be effective at increasing physical activity, also decreased self-reported sitting time. The effect of sedentary behavior on diabetes development was also examined.
MedicalResearch: What are the main findings?Response: For the lifestyle participants, a reduction in reported TV watching alone and the combination of TV watching and work sitting was observed. This reduction was significantly greater than any changes seen in the other two randomized groups, who did not receive the intervention. Because these reductions were accomplished without an explicit program goal to reduce sitting we feel optimistic that with better awareness of sitting behaviors and goal setting to reduce sitting it may be possible to have an even greater impact than what was achieved in this cohort.
Additionally, our results showed that for every hour spent watching TV there was a 3.4% increased risk of developing diabetes during the 3 year follow-up period in individuals at high risk for diabetes. This finding means that reductions in sitting can translate into a positive health effect separate from improvements in moderate-vigorous activity.
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MedicalResearch.com Interview with:
Pamela S. Douglas, M.D.
Duke University School of Medicine
Duke University Medical Center
Durham, NC 27715
Medical Research: What is the background for this study?
Dr. Douglas: The primary objective of the PROMISE study was to compare the health outcomes of people who went to the doctor with new symptoms such as shortness of breath and/or chest pain that were suggestive of coronary artery disease and that required additional evaluation. This was an important investigation because no large research trial has ever been conducted to help guide the care of such patients. Instead, the selection of tests for such patients—which constitutes at least 4 million patients in the United States each year—has been largely left up to physician and patient preference rather than proven results.
Medical Research: What are the main findings?
Dr. Douglas: 10,003 patients from 193 different medical facilities across the US and Canada agreed to be part of the PROMISE study and were randomized to a functional stress test or an anatomic test Using CT angiography. The study found that the clinical outcomes of participants with suspected coronary artery disease were excellent overall, and were similar in terms of death and major cardiac conditions regardless of whether patients had a functional stress test or a computed tomographic scan. However, the CT scan may be better at ruling out the need for subsequent tests and procedures in patients who are free of heart disease, and involved a lower radiation exposure relative to a stress nuclear study. We also found, in a separately reported study, that the costs of the two diagnostic strategies were similar.
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MedicalResearch.com Interview with:
Elizabeth Lowenthal, MD MSCE
Assistant Professor of Pediatrics
Children's Hospital of Philadelphia
Medical Research: What is the background for this study? What are the main findings?
Dr. Lowenthal: Between 2005 and 2012, HIV related deaths declined by 30% worldwide. However, during the same time period, HIV related deaths increased 50% among adolescents. Over 90% of HIV-infected children and adolescents live in sub-Saharan Africa and HIV is the leading cause of death among adolescents in Africa. Treatment is available that can allow babies born with HIV to live to be healthy adults. However, strict adherence to these medicines is necessary and often becomes a great challenge during adolescence. In our study of 300 adolescents (ages 10-19) in Botswana, my team found that adolescents who come to clinic without a parent or guardian have a 4.5X greater odds of failing their HIV treatment.
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MedicalResearch.com Interview with:
Lu Qi, MD, PhD, FAHA
Assistant Professor of Medicine
Harvard Medical School
Assistant Professor of Nutrition
Harvard T. H. Chan School of...
MedicalResearch.com Interview with:
Maria L. Wei, M.D., Ph.D.
Associate Professor of Dermatology
Director, Melanoma Surveillance Clinic
Multidisciplinary Melanoma Program
University of California, San Francisco
Staff Physician
Veterans Affairs Medical Center, San Francisco
Medical Research: What is the background for this study?
Dr. Wei: Effective physician-patient communication is essential for optimal medical care. There are now many methods available to notify patients of their biopsy results: a clinic visit (the method traditionally preferred by patients), a telephone call, secure online patient portals to access medical charts, email and texts. In addition, there is variability from state to state in the guidelines regulating the release of biopsy results online. Until recently, some states did not allow the on-line release of biopsy results. There have been few systematic studies on patient preferences for communication of biopsy results. (more…)
MedicalResearch.com Interview with:
Marc Ryser PhD
Visiting Assistant Professor Department of Mathematics
Duke University Durham, North Carolina
Medical Research: What is the background for this studyDr. Ryser: Infection with the human papillomavirus (HPV) is responsible for approximately 5% of all cancers worldwide. In addition to cervical cancers, HPV is associated with various other female and male cancers, including cancers of the anus and oropharynx. Despite expansive screening and vaccination programs, HPV-related cancers remain a serious public health concern in the US and abroad. To further improve public health interventions against HPV, a thorough understanding of the underlying biology is critical.
The lifetime risk of getting infected with HPV is as high as 80%, yet most individuals remain asymptomatic and clear the virus after 1-2 years. However, if an infection with a high-risk type of HPV persists, the virus can interfere with the replication mechanism of the host cells, and initiate tumor growth. Even though our understanding is incomplete to date, clearance of HPV infections is primarily attributed to an effective immune response.
Interestingly, recent studies about the stem cell dynamics in epithelial tissues - the types of tissues that are affected by HPV - have shown that the fate of these stem cells is random: most of the time, a stem cell divides into a new stem cell and a differentiating daughter cell; however, every now and then, a stem cell divides either into two stem cells, or into two differentiating daughter cells. These dynamics have not been acknowledged by the HPV community, and our goal was to develop mathematical models to examine whether the random division patterns of stem cells could play a role in the clearance of HPV infections.
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MedicalResearch.com Interview with:
Sayan Sen, PhDInternational Centre for Circulatory Health, National Heart and Lung Institute
Imperial College London
London, United Kingdom
Medical Research: What is the background for this study? What are the main findings?
Dr. Sayan Sen: Intra-aortic balloon pumps (IABP) are often used in Acute Myocardial Infarction, particularly in patients with cardiogenic shock. We analysed the available Randomized Controlled Trials (RCT) and observational studies, spanning 30 years, to establish the evidence for this use.
There is no identifiable group of patients with Acute Myocardial Infarction that have been demonstrated to derive a mortality benefit from insertion of an IABP. The studies, including over 17000 patients, have studied mortality in patients receiving IABP in comparison to mortality of patients that received no IABP in the era of no reperfusion, fibrinolysis and primary percutaneous intervention. This lack of mortality reduction with IABP in AMI is consistent in patients with and without cardiogenic shock across both RCTs and observational studies; questioning the continued use of this technology in Acute Myocardial Infarction.(more…)
MedicalResearch.com Interview with: Benjamin Davis BA
CLF-Lerner Fellow at the Johns Hopkins Center for a Livable Future.
Medical Research: What is the background for this study? What are the main findings?
Response: The Food and Drug Administration banned the inter-state sale of raw (i.e. unpasteurized) milk in 1987. Currently 30 states still allow raw milk sales on local farms or in stores. We were requested by the Maryland General Assembly's Health and Government Operations Committee to conduct a review of the health benefits and risks of raw versus pasteurized milk in response to proposed legislation that would legalize raw milk in the state. After reviewing over 80 scientific articles we concluded that raw milk carries a substantially higher risk of foodborne illness when compared to pasteurized milk. However drinking raw milk may reduce allergies among children in rural settings. (more…)
MedicalResearch.com Interview with:
Jorge E. Chavarro, M.D., Sc.D.
Assistant Professor of Nutrition and Epidemiology
Harvard T.H. Chan School of Public Health
Assistant Professor of Medicine
Harvard Medical School Boston, MA 02113
Medical Research: What is the background for this study?
Dr. Chavarro: Previous studies have shown that occupational exposure to pesticides is harmful to sperm production. However, whether the same is true for pesticide residues in our food, the most important source of exposure to pesticides for most people, is unclear.
Medical Research: What are the main findings?
Dr. Chavarro: Bottom line, men who consumed the greatest amounts of fruits and vegetables with large amounts of pesticide residues had significantly lower sperm counts and fewer morphologically normal sperm.
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MedicalResearch.com Interview with:
Dr. Jean-Luc Margot PhD
Professor, Department of Earth, Planetary, and Space Sciences and Department of Physics and Astronomy,
University of California, Los Angeles
Medical Research: What is the background for this study? What are the main findings?
Dr. Margot: Some professionals who work in emergency rooms or maternity wards believe that the number of hospital admissions or human births is larger during the full moon than at other times. This belief is incorrect. Analysis of the data shows conclusively that the moon does not influence the timing of hospital admissions or human births.
Results of a new analysis have been published online in the journal Nursing Research. The Nursing Research article addresses some of the methodological errors and cognitive biases that can explain the human tendency of perceiving a lunar effect where there is none. It reviews basic standards of evidence and, using an example from the published literature, illustrates how disregarding these standards can lead to erroneous conclusions. (more…)
MedicalResearch.com Interview with:
Majuran Perinpam, BsC
Mayo Clinic
Rochester, Minn
MedicalResearch: What is the background for this study?Response: The four key urinary factors: Calcium, magnesium, oxalate and uric acid are all implicated in kidney stone formation. Age and sex are known to influence kidney stone risk and type (1). However the effects of demographics on excretion of the four key urinary factors are not clear. Since diet alters urinary excretions of the four factors, adjusting for this is important. During metabolic evaluation of kidney stone patients, these urinary factors are often measured in 24-hour urine samples. However, often a single adult reference range is used and the effect of demographics is rarely taken into account during the interpretation of results.
MedicalResearch: What are the main findings?Response: From a cohort of 709 healthy individuals we found a substantial influence of age and sex on the excretion of urinary calcium. Adjusted models showed that urinary calcium, magnesium, oxalate and uric acid were all less in females, possibly explaining why kidney stones are more dominant in males (1). Also a positive association of urinary uric acid excretion with Cystatin C eGFR, but not eGFR calculated from creatinine, suggests cystatin C to possibly being involved in inflammation and hyperuricemia. But further studies are needed to investigate this.
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MedicalResearch.com Interview with:
Ryan Jeffrey Shaw, PhD, MS, RN
Assistant Professor School of Nursing
Center for Health Informatics
Center for Precision Medicine
Duke University
Medical Research: What is the background for this study? What are the main findings?
Dr. Shaw: Primary care delivery revolves around a series of episodes, rather than functioning as a continuum. When patients come to a clinic data on their health is collected as a single data point. This model neglects potentially meaningful data from patients’ daily lives and results in less informed treatment and scheduling of follow-up visits. Lack of meaningful data further blinds clinicians to patients’ health outside of the clinic and can contribute to unnecessary emergency department visits and hospitalizations.
Personalized care through mobile health technologies inspires the transition from isolated snapshots based on serial visits to real time and trended data. By using technologies from cell phones to wearable sensors, providers have the ability to monitor patients and families outside of the traditional office visit.
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MedicalResearch.com Interview with:
Peter Muennig, MD, MPH
Columbia University
Mailman School of Public Health
NYC 10032
Medical Research: What is the background for this study? What are the main findings?Dr. Muennig: The Oregon Health Insurance Experiment (OHIE) is one of just two experimental investigations of the health benefits of medical insurance. The first was the Rand Health Insurance Experiment, which was conducted over 3 decades ago. The OHIE randomly assigned participants to receive Medicaid or their usual care. It found that Medicaid protected families from financial ruin caused by medical illness, that it reduced depression, and that it increased preventive screening tests. However, it produced no medical benefits with respect to high blood pressure, diabetes, or high cholesterol. Medicaid opponents suggested that this meant that we should get rid of Medicaid because Medicaid does not improve physical health. But Medicaid proponents suggested that too few participants enrolled to detect a benefit, and, regardless of the study’s flaws, reduced depression, financial protections, and improved screening were reason enough to continue.
We found that the Medicaid opponents were right. Medicaid actually didn’t produce any meaningful benefits with respect to blood pressure, diabetes, or cholesterol. But we also found that the Medicaid proponents were right. It’s impacts on depression alone rendered it cost-effective even if one does not account for the benefits of financial protections or medical screening.(more…)
MedicalResearch.com Interview with:
Mohammad Kazem Fallahzadeh Abarghouei, M.D.
Baylor University Medical Center, Dallas, TX
Medical Research: What is the background for this study?
Response: Uremic pruritus (itch) is a common problem in hemodialysis patients. No effective treatment exists for uremic pruritus due to its complex pathogenesis. Systemic inflammation and elevated serum levels of interleukin-2 (IL-2) are implicated in the pathogenesis of uremic pruritus. Senna is an herbal drug commonly used for treatment of constipation. Senna also has anti-inflammatory properties. We performed this randomized double-blind placebo-controlled trial to evaluate the effect of senna on reduction of uremic pruritus and serum levels of IL-2 in hemodialysis patients.
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