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Archive for July 2017

Science Policy Around the Web – July 21, 2017

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By: Rachel F Smallwood, PhD

Source: pixabay

Cancer

Engineered Cell Therapy for Cancer Gets Thumbs Up from FDA Advisers

A panel of advisers has recommended that the FDA approve chimeric antigen receptor T-cell (CAR-T) therapy for treatment of acute B-cell lymphoblastomic leukemia. The committee unanimously agreed that the risk to benefit ratio was favorable enough to proceed with approval of the drug (tisagenlecleucel), manufactured by Novartis. CAR-T therapy utilizes a patient’s own immune cells to find and attack cancer cells. In a recent trial in humans, 82.5% of patients went into remission following treatment with the drug; there have also been promising results from its use in glioblastoma treatment. The treatment would specifically be for pediatric and young adult patients who did not respond well to initial treatments or who relapsed from being in remission.

Despite have strong positive effects, there are potential risks posed by CAR-T therapy. In the study mentioned above, almost half of the patients experienced an inflammatory reaction called cytokine release syndrome. Although all of those cases were treatable, the condition can be life-threatening. Novartis also reported neurological problems. Other CAR-T trials have had several deaths due to brain swelling, but those were in adult populations and were some differences in the therapies.

The FDA often does take the recommendations of its advisers, but there is much to consider in this decision. It would essentially be approving a living drug that is individualized to each patient; the patients’ own blood cells are sent to a manufacturing center, where they are genetically engineered to target leukemia cells. The cell population is then allowed to proliferate, and the entire process takes around twenty-two days. This process presents a quality assurance and control problem to the FDA. However, the target population typically has a poor prognosis and very few options, so the panel considers the potential for increased survival and quality of life to be worth the risks. (Heidi Ledford, Nature News)

Stem-Cell Therapy

Unapproved Stem-Cell Treatments Touted on Federal Database Clinicaltrials.Gov

ClinicalTrials.gov is an online database, curated by the National Library of Medicine and the National Institutes of Health, that logs clinical studies occurring around the country and allows them to be searched by patients, family members, healthcare providers, and researchers. The information on the site is provided by the researchers or sponsors of the individual studies themselves. It allows patients and healthy people to become aware of opportunities to participate in medical research. These studies involve a wide range of treatments, including drugs, devices, behavioral therapies, and procedures.

A recent study found that the database is being abused by clinics advertising for stem cell trials. These trials target individuals looking for treatment for a variety of conditions, and all of them charge for participation. There are very few FDA-approved stem cell therapies, and most clinics that utilize stem cell therapies assert that they do not need FDA approval since they are practicing medicine and do not substantially alter the stem cells (although that is disputed).  Since the researchers themselves indicate in the database whether they need FDA approval, there is little oversight to ensure these studies are correctly representing the risks and benefits of their treatment.

Although a disclaimer was added this spring that informs visitors that the presence of a trial in the database does not indicate government endorsement of it, many people do not realize that they could potentially be participating in a for-profit procedure that does not have the proper oversight to ensure patient safety. In one such case, three women were blinded who paid to receive stem cell therapy for macular degeneration. Most legitimate research studies will not require payment for participation, although travel and lodging costs associated with participation may be incurred.

While many patients may receive treatment at one of these clinics without an adverse event or even with a positive result, critics of these types of clinics are calling for regulation of entries into the ClinicalTrials.gov system. They assert that a federal resource for medical research should not be used to advertise for for-profit clinics that are utilizing therapies that have not been studied or reviewed for safety and efficacy. (Laurie McGinley, Washington Post)

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Written by sciencepolicyforall

July 21, 2017 at 10:08 am

The Economic Impact of Biosimilars on Healthcare

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By: Devika Kapuria, MD

          Biologic drugs, also defined as large molecules, are an ever-increasing source of healthcare costs in the US. In contrast to small, chemically manufactured molecules, classic active substances that make up 90 percent of the drugs on the market today, biologics are therapeutic proteins that undergo production through biotechnological processes, some of which may require over 1000 steps. The average daily cost of a biologic in the US is $45 when compared with a chemical drug that costs only $2. Though expensive, their advent has significantly changed disease management and improved outcomes for patients with chronic diseases such as inflammatory bowel disease, rheumatoid arthritis and various forms of cancer. Between 2015-2016, biologics accounted for 20% of the global health market, and they are predicted to increase to almost 30% by 2020. Worldwide revenue from biologic drugs quadrupled from US $47 billion in 2002 to over US $200 billion in 2013.

The United States’ Food and Drug Administration (FDA) has defined a biosimilar as a biologic product that is highly similar to the reference product, notwithstanding minor differences in clinically-inactive components, and for which there are no clinically meaningful differences between the biologic product and the innovator product in terms of safety, purity and efficacy. For example, CT-P13 (Inflectra) is a biosimilar to infliximab (chimeric monoclonal antibody against TNF-α) that has recently obtained approval from the FDA for use of treatment of inflammatory bowel disease. CT-P13 has similar but slightly different pharmacokinetics and efficacy compared to infliximab. With many biologics going off patent, the biosimilar industry has expanded greatly. In the last two years alone, the FDA approved 4 biosimilar medications: Zarxio (filgrastim-sndz), Inflectra (infliximab-dyyb), Erelzi (etanercept-szzs) and Amjevita (adalimumab-atto).

Unlike generic versions of chemical drugs (small molecules that are significantly cheaper than their branded counterparts), the price difference between a biosimilar and the original biologic is not huge. This is due to several reasons. First, the development time and cost for biosimilars is much more than for generic medications. It takes 8-10 years and several hundred million dollars for the development of a biosimilar compared to around 5 years and $1-$5 million for the generic version of a small molecule drug. With only single entrants per category in the US, biosimilars are priced 15-20% lower than their brand name rivals, which, though cheaper, still amount to hundreds of thousands of dollars. By the end of 2016, the estimated global sales from biosimilars amounted to US $2.6 billion, and nearly $4 billion by 2019. Estimates for the cost savings of biosimilars for the US market are variable; the Congressional Budget Office estimated that the BPCI (Biologics Price Competition and Innovation) Act of 2009 would reduce expenditures on biologics by $25 billion by 2018. Another analysis from the Rand Corporation estimated that biosimilars would result in a $44.2 billion reduction in biologic spending between 2014 and 2024.

In the United States, a regulatory approval pathway for biosimilars was not established till the Patient Protection and Affordable Care Act of 2010. However, biosimilars have been used in Europe for over a decade, and this has led to the development of strategies for quicker adaptation, including changes in manufacturing, scaling up production and adapting to local healthcare policies. These changes have led to a competitive performance of biosimilars in the European market, with first generation biosimilars taking up between 50-80% of the market across 5 European countries, with an expected cost savings of $15 to$44 billion by 2020. One example that demonstrates a significant discount involves the marketing of Remsima, a biosimilar of Remicade (infliximab). In Norway, an aggressive approach towards marketing of Remsima was adopted with a 69% discount in comparison to the reference product. After two years, Remsima has garnered 92.9% of the market share in the country.

The shift to biosimilars may be challenging for both physicians and patients. While safety concerns related to biosimilars have been alleviated with post marketing studies from Europe, there still remains a significant lack of awareness about biosimilars amongst healthcare providers, especially about prescribing and administering them. Patient acceptance remains an important aspect as well, with several patients loyal to the reference brand who may not have the same level of confidence in the biosimilar. Also, like with generics, patients may believe that biosimilars are, in some way, inferior to the reference product. Increased reporting of post marketing studies and pharmacovigilance can play a role in alleviating some of these concerns.

In 2015, the FDA approved the first biosimilar in the US, after which, it has published a series of guidelines for biosimilar approval, under the BPCA act, including demonstrating biosimilarity and interchangeability with the reference product. This includes a total of 3 final guideline documents and 5 draft guidance documents. Starting in September 2017, the World Health Organization will accept applications for prequalification into their Essential Medication list for biosimilar versions of rituximab and trastuzumab, for the treatment of cancer. This program ensures that medications purchased by international agencies like the UNICEF meet standards for quality, safety and efficacy. Hopefully, this will increase competition in the biosimilar market to reduce price and increase access to medications in low-income countries.

Both human and economic factors need to be considered in this rapidly growing field. Increasing awareness among prescribers and patients about the safety and efficacy of biosimilars as well as improving regulatory aspects are essential for the widespread adaptation of biosimilars.

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Written by sciencepolicyforall

July 19, 2017 at 10:42 am

Science Policy Around the Web – July 7, 2017

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By: Leopold Kong, PhD

Food Policy

Food and Microbiota in the FDA Regulatory Framework

More and more probiotic food products, or microbiota-directed foods, claiming to “improve” the body’s microbiota have been hitting the shelves, with sales valuing over US$700 million in the US alone and US$36.6 billion globally this past year. However, there is little framework regulating their ingredients or guaranteeing the scientific accuracy of their health claims that has resulted in costly legal action. For example, in September 2009, Dannon settled a US$35 million consumer class action suit challenging the claimed health benefits in their ads. A similar class action suit against Procter & Gamble’s Align probiotic has been certified and set for Oct. 16, 2017. A paper recently published in the journal Science calls for greater clarity in policy regulating probiotic products. Importantly, the authors urge that probiotics should be clearly classified as a dietary supplement, a medical food, or a drug. If classified as a dietary supplement, probiotics can make claims on nutrient content and effect on health, but not on treatment, prevention or diagnosis of disease. If classified as a medical food, probiotics must contain ingredients that aid in the management of a disease or condition, with “distinctive nutritional requirements”, that is scientifically recognized. Finally, if classified as a drug, probiotics will require clinical trials to prove its medical claims. An alternative, and perhaps cheaper, way forward is to regulate probiotics as a kind of over-the counter medical food, requiring testing only for their active ingredients that can be used in a variety of products. (Green et al., Science)

Antibiotic Resistance

Untreatable Gonorrhoea on the Rise Worldwide

Over 78 million people are infected with gonorrhea each year, a sexually transmitted disease that has traditionally been treated effectively with anti-microbials. However, recently published data from 77 countries show that antibiotic-resistant gonorrhea is getting more pervasive and harder to cure. “The bacteria that cause gonorrhea are particularly smart. Every time we use a new class of antibiotics to treat the infection, the bacteria evolve to resist them,” said Dr. Teodora Wi, Medical Officer, Human Reproduction, at the WHO. The data found widespread resistance to ciprofaxacin, azithromycin, and even to the last-resort treatments, oral cefixime and injectable ceftriaxone. New drugs are under development, including a phase III trial of a new antibiotic, zoliflodacin, launched by the non-governmental organization Drugs for Neglected Diseases Initiative and Entasis Therapeutics, a biotech company in Waltham, Massachusetts. Better prevention through education on safer sexual behavior and more affordable diagnostics will also be needed moving forward. (Amy Maxmen, Nature News)

Maternal Health

U.S. has the Worst Rate of Maternal Deaths in the Developed World

A recent six-month long investigation by NPR and ProPublica has found that more women in the US are dying of pregnancy related complications than any other developed country. Surprisingly, this rate is increasing only in the US, which stood at ~ 26.4 deaths per 100,000 births in 2015, translating to nearly 65,000 deaths annually.  This is three times worse than for women in Canada, and six times worse than for women in Scandinavian countries. Reasons include older new mothers with more complex medical histories, unplanned pregnancies, which are the case half the time in the US, greater prevalence of C-sections, and the fragmented health system. This is in contrast with progress in preventing infant mortality, which has reached historic levels in the US. Better medical training for maternal emergency and more federal funding for research in this area may improve the situation for American mothers. (Nina Martin and Renee Montagne, NPR)

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Science Policy Around the Web – July 7, 2017

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By: Liu-Ya Tang, PhD

Source: pixabay

Autism

Is There Such a Thing as an Autism Gene?

Autism has become a global burden of disease. In 2015, it was estimated to affect 24.8 million people globally. Significant research efforts are underway to investigate the causes of autism. Autism is highly heritable – there is an 80 percent chance that a child would be autistic if an identical twin has autism. The corresponding rate is about 40 percent for fraternal twins.

However, is there such a thing as a single autism gene? Researchers haven’t found one specific gene that is consistently mutated in every person with autism. Conversely, 65 genes are strongly linked to autism and more than 200 others have weaker ties, many of which are related to important neuronal functions. Mutations in a variety of these genes can collectively lead to autism. The mutations could be from single DNA base pair, or copy number variations, which are deletions or duplications of long stretches of DNA that may involve many genes. Most mutations are inherited, but some mutations could also happen in an egg or sperm, or even after conception.

Besides genetic factors, maternal lifestyle and environmental factors can also contribute to autism. Exposure to air pollution during pregnancy or a maternal immune response in the womb may increase the risk of autism. While there is speculation on the link between vaccines and autism, it is not backed by scientific evidence.

Since both genetic and non-genetic factors play a role in the development of autism, establishing the underlying mechanism is complicated. There is no single specific test that can be used for screening autism. However, some tests are available to detect large chromosomal abnormalities or fragile X syndrome, which is associated with autism. (Nicholette Zeliadt, Washington Post)

STEM Education

New Florida Law Lets any Resident Challenge What’s Taught in Science Classes

A new law was signed by Florida Gov. Rick Scott (R) last week, and has taken effect starting July 1. The law requires school boards to hire an “unbiased hearing officer” to handle complaints about teaching materials that are used in local schools. Any county resident can file a complaint, and the material in question will be removed from the curriculum if the hearing officer thinks that the material is “pornographic,” or “is not suited to student needs and their ability to comprehend the material presented, or is inappropriate for the grade level and age group.”

There are different voices in the new legislation, which affects 2.7 million public school students in Florida. Proponents argue that it gives residents more right in participating in their children’s education. A sponsor, state Rep. Byron Donalds (R-Naples), said that his intent wasn’t to target any particular subject. However, Glenn Branch, deputy director of the National Council for Science Education, is worried that science instruction will be challenged since evolution and climate change have been disputed subjects. A group called Florida Citizens for Science asked people to pay close attention to classroom materials and “be willing to stand up for sound science education.”

Like the new law in Florida, the legislature in Idaho rejected several sections of the state’s new public school science standards related to climate change and requested a resubmission for approval this fall. Since the Trump administration began, there has been “a new wave of bills” targeting science in the classroom. To protect teacher’s “academic freedom,” Alabama and Indiana adopted non-binding resolutions that encourage teachers to discuss the controversy around subjects such as climate change. A supporter of the resolution, state Sen. Jeff Raatz (R-Centerville), told Frontline, “Whether it be evolution or the argument about global warming, we don’t want teachers to be afraid to converse about such things”. (Sarah Kaplan, Washington Post)

 

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Written by sciencepolicyforall

July 7, 2017 at 1:32 pm