AIDS Patients with Serious Complications Benefit from Early Retroviral Use, Stanford Study Shows.
STANFORD, Calif. -- HIV-positive patients who don't seek medical attention until they have a serious AIDS-related condition can reduce their risk of death or other complications by half if they get antiretroviral treatment early on, according to a new multicenter trial led by researchers at the Stanford University School of Medicine Stanford University School of Medicine is affiliated with Stanford University and is located at Stanford University Medical Center in Stanford, California, adjacent to Palo Alto and Menlo Park. .
The study results could lead to widespread changes in treatment for HIV HIV (Human Immunodeficiency Virus), either of two closely related retroviruses that invade T-helper lymphocytes and are responsible for AIDS. There are two types of HIV: HIV-1 and HIV-2. HIV-1 is responsible for the vast majority of AIDS in the United States. patients, particularly those diagnosed at an advanced stage, experts say.
"Even in San Francisco, one of the first epicenters of HIV in the United States, we still find that many people still present late in the course of their illness with an opportunistic infection opportunistic infection
An infection by a microorganism that normally does not cause disease but becomes pathogenic when the body's immune system is impaired and unable to fight off infection, as in AIDS and certain other diseases. ," said Mitch Katz, MD, San Francisco's director of health, who was not involved in the study. "This study shows that it is life-saving to treat those persons with antiretroviral drugs Antiretroviral Drugs Definition
Antiretroviral drugs inhibit the reproduction of retroviruses—viruses composed of RNA rather than DNA. The best known of this group is HIV, human immunodeficiency virus, the causative agent of AIDS. while they are still in the hospital. The results of this study will change practices throughout the world."
Some 60,000 to 70,000 newly HIV-infected individuals are identified every year in the United States, according to recently revised figures from the federal Centers for Disease Control and Prevention Centers for Disease Control and Prevention (CDC), agency of the U.S. Public Health Service since 1973, with headquarters in Atlanta; it was established in 1946 as the Communicable Disease Center. . A growing number of these patients, particularly minorities, youth, injection-drug users and those in poor rural areas, are being diagnosed late in the disease process when they've already developed life-threatening conditions, said Andrew Zolopa, MD, associate professor of infectious diseases and geographic medicine at Stanford and first author of the study. When these patients come for treatment of these complications, doctors are often reluctant to give them anti-AIDS drugs at the same time, fearing the two therapies could interfere with one another.
"A lot of people wait, thinking, 'Let's get the patient out of acute crisis, and then we'll deal with the underlying HIV infection later,'" said Zolopa. "But that answer is wrong. If we're more aggressive with HIV drugs, we can reduce AIDS-related complications and death by 50 percent. It's a substantial clinical benefit."
The study was conducted by the AIDS Clinical Trials Group The AIDS Clinical Trials Group (ACTG) is the largest HIV clinical trials organization in the world, playing a major role in setting standards of care for HIV infection and opportunistic diseases related to HIV and AIDS in the United States and the developed world. , the world's largest clinical trial organization. Results will be published May 18 in the online journal PLoS-ONE.
William Powderly, MD, dean of medicine at the University College Dublin School of Medicine, said the study addresses one of the last, longstanding unknowns in the management of AIDS.
"Clinicians have long grappled with the question of whether or not early treatment with antiviral drugs Antiviral Drugs Definition
Antiviral drugs are medicines that cure or control virus infections.
Antivirals are used to treat infections caused by viruses. will help people who come to the hospital with advanced infections, such as pneumonia," said Powderly, MD, the study's senior author. "The answer is clearly yes. Early antiviral treatment for HIV improves the clinical outcome, including the likelihood of surviving in the next few months. It probably does so by improving the immune system immune system
Cells, cell products, organs, and structures of the body involved in the detection and destruction of foreign invaders, such as bacteria, viruses, and cancer cells. Immunity is based on the system's ability to launch a defense against such invaders. and therefore adds to the ability to resist these infections."
The study findings, presented in abstract form at an earlier scientific meeting, are already starting to change clinical practices. The International AIDS Society The International AIDS Society (IAS) is an international society for scientists, health care and public health workers, and others engaged in HIV/AIDS prevention, control and care. , the CDC See Control Data, century date change and Back Orifice.
CDC - Control Data Corporation and the British AIDS Society all have adopted guidelines that recommend that early antiretroviral treatment be considered in patients with an opportunistic infection, Zolopa noted.
The study involved 262 patients at 39 sites across the United States, from Puerto Rico to Seattle. An additional 20 patients were enrolled in a hospital in Johannesburg, South Africa. Eighty-five percent of the patients were men whose median age was 28. They were an ethnically diverse group: 37 percent were black, 36 percent Hispanic, 23 percent white and 5 percent Asian.
The patients all had one or more opportunistic infection, with the most common ones being pneumocystis Pneumocystis /Pneu·mo·cys·tis/ (-sis´tis) a genus of yeastlike fungi. P. cari´nii is the causative agent of interstitial plasma cell pneumonia.
n. jirovecii pneumonia, cryptococcal meningitis cryptococcal meningitis Neurology An opportunistic infection of the meninges and spinal cord by Cryptococcus neoformans At-risk Pts AIDS, lymphoma, DM Clinical Severe headache, confusion, photosensitivity, blurred vision, fever, speech difficulties and serious bacterial infections. Patients with tuberculosis were excluded from the study because it was unclear what the optimal antiviral treatment was for these patients, Zolopa said.
The patients, who were enrolled between May 2003 and August 2006, were separated into two groups: those who got antiretroviral treatment early and those for whom this treatment was delayed until their opportunistic infections Opportunistic infections
Infections that cause a disease only when the host's immune system is impaired. The classic opportunistic infection never leads to disease in the normal host. had been dealt with. The patients were all offered antiretroviral drugs free of charge. The drugs for the study were supplied by Abbott Laboratories (lopinavir/ritonavir), Gilead Sciences (tenofovir and emtricitabine) and Bristol-Myers Squibb (stavudine).
The patients in the early intervention arm of the study were treated with ARVs within an average of 12 days, while those in the deferred group received the treatment within an average of 45 days after the start of treatment for the opportunistic infection. Among the patients treated early, there were 20 (14.2 percent) who died or developed another significant AIDS-related complication. That compared with 34 patients (24.1 percent) in the deferred group who died or suffered a new complication.
In addition, the patients in the early treatment group saw a much swifter recovery of their immune systems. The early group patients saw their T-cell counts, a measure of the immune cells destroyed by the AIDS virus, increase to more than 100 within four weeks. In the deferred treatment group, it took 12 weeks for the patients' T cells to reach that same level, the researchers reported.
"I was quite impressed at how rapidly these T cells could rise in these patients," Zolopa said. "By starting ARVs early you can effectively reduce the window of vulnerability A window of vulnerability or wov is a time frame within which defensive measures are reduced, compromised or lacking.
The term is used with reference to military defences of strategic assets, and also by analogy in computer software to a software vulnerability which is open where another AIDS-related complication could develop."
Zolopa said there was no difference between the two sets of patients in their adherence to their prescribed regimens. One concern in treating patients with ARVs soon after being diagnosed with AIDS is that they might not stick to their treatments and could then develop drug resistance. But adherence did not prove to be an issue, he noted.
"Starting the therapies early didn't scare people off," he said.
According to Zolopa, the study results probably provide some guidance for patients in developing countries, though each country would have to determine its own strategy for initiating ARVs in patients with advanced AIDS.
"These results do have important implications across the globe," he said.
Although the study did not include patients with tuberculosis, the most common AIDS-related complication among patients in sub-Saharan Africa, early ARV ARV
American Revised Version
ARV n abbr (= American Revised Version) → traducción americana de la Biblia
ARV n abbr (= treatment has been shown in other, more recent studies to be of value in those patients with TB, Powderly said.
Zolopa said implementing the study findings could entail some logistical challenges, as hospitals will have to develop interdisciplinary teams, including pulmonary specialists, emergency physicians, pharmacists and others, in coordinating early treatment for these critically ill patients as they come into the system.
Other researchers in the study are Janet Andersen, ScD, and Lauren Komarow, both with Harvard School of Public Health The Harvard School of Public Health is (colloquially, HSPH) is one of the professional graduate schools of Harvard University. Located in Longwood Area of the Boston, Massachusetts neighborhood of Mission Hill, next to Harvard Medical School and Cambridge, Massachusetts, ; Ian Sanne, MD, of the South African College The South African College was an educational institution in Cape Town, South Africa, which developed into the University of Cape Town (UCT) and the South African College Schools (SACS). of Physicians; Alejandro Sanchez, MD, of the USC An abbreviation for U.S. Code. Keck School of Medicine; Evelyn Hogg with Social & Scientific Systems, Inc.; and Carol Suckow with the Frontier Science and Technology Research Foundation.
The study was funded by the National Institutes of Health through the Division of AIDS.
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