Tuesday, September 23, 2008

GSK - Paxil: the Professor Martin Keller story redux


Among the reasons Sen. Charles Grassley, R-Iowa, has targeted Professor of Psychiatry and Human Behavior Martin Keller (pic) in his scrutiny of conflicts of interest in clinical research is Keller's authorship of a controversial study of the antidepressant Paxil in children.

The study and its authors have been fiercely criticized in medical journals for allegedly misrepresenting data, suppressing information linking the drug to suicidal tendencies and reaching a conclusion unsupported by the relevant data.

The Brown Daily Herald contacted Keller several times starting Sept. 10, but he said he was unavailable for comment before press time.

Keller and his colleagues began looking into paroxetine - marketed as Paxil in the United States - in 1992, when they successfully sought funding for a study of the drug from its maker, SmithKline Beecham - now known as GlaxoSmithKline after a 2001 merger with GlaxoWellcome. The study, which compared Paxil with another class of antidepressant and a placebo, ran from 1994 to 1997.

Referred to by GSK as Study 329, the study investigated whether Paxil was safe and effective for use in adolescent children suffering from depression. Paxil is a popular antidepressant widely prescribed by physicians to adult patients, but few large-scale studies of its use in children were conducted before Keller's. The results of the study were compiled in 1998 and published in 2001 in the Journal of the American Academy of Child and Adolescent Psychiatry, which listed Keller as the lead author in front of 21 others. It found that "paroxetine is generally well tolerated and effective for major depression in adolescents."

But even as questions about Keller's financial relationships with drug companies remain open, several members of the medical and legal communities have independently criticized his research on scientific grounds. Articles in medical journals and letters to journal editors have called into question the scientific practices that led to Study 329's conclusion that Paxil is a safe and effective way to treat depression in children.

Misrepresentation, profs say

In 2003, University of Adelaide physicians Jon Jureidini and Ann Tonkin wrote a strongly worded letter to the editor of JAACAP expressing their concern over what they felt was a conclusion unsupported by the data.The letter argues that the criteria originally decided upon to determine whether Paxil was effective failed to show that Paxil was better than no treatment at all.

Specifically, improvements on the Hamilton rating scale for depression - a questionnaire that rates the severity of symptoms like mood, insomnia and anxiety - were not significantly greater for patients on Paxil than for patients on a placebo or a different drug, imipramine. Paxil patients did improve more than the other two groups, but the improvements in the "primary outcome measures" were too small to support the study's conclusion that Paxil was effective.

In their response to the letter, Keller and seven of Study 329's co-authors conceded that the primary outcome measures decided upon "did not reach significance," but pointed to a number of "secondary outcome measures" - such as scores on other depression assessment tests - that did show a significant improvement.Keller's response added that in the time between 1993, when the relevant outcome measures were chosen, and 1998, when the study was written, the psychiatric community had moved away from the Hamilton scale and toward the measures that had turned out to be significant.

Though much of the medical community appeared to side with Jureidini and Tonkin - including the editorial boards of leading medical journals the Lancet and the Canadian Medical Association Journal - the disagreement appeared to have reached an impasse, which wasn't bridged until this year.

In May, Jureidini and two other colleagues published a review of Study 329 in the International Journal of Risk and Safety in Medicine. In the intervening time between the 2003 letter and the 2008 article, lawsuits against GSK by families of patients who claimed to have been harmed by Paxil gave Jureidini access to previously unreleased documents. Those documents were subpoenaed by the law firm Baum, Hedlund, Aristei and Goldman, which compensated Jureidini for his work.

Among the documents Jureidini could access were drafts of the paper that had been submitted for peer review. Before medical journals accept papers for publication, drafts are circulated among medical professionals to carefully scan the paper for miscalculations, careless errors, misleading figures and occasionally larger, more critical inaccuracies.

Jureidini learned that the paper had been rejected by the Journal of the American Medical Association, the world's most widely circulated medical journal. But, more crucially, Jureidini could now sketch out a timeline of the evolution of the paper, from the first draft submitted to JAMA in 1999 to the final draft published in JAACAP in 2001.The drafts showed that none of the eight outcome measures outlined in the original 1993 protocols showed a significant positive effect for Paxil over placebo.

Instead, Jureidini argued that the authors had used "selective reporting" to produce their positive conclusion, and introduced new outcome measures in the 2001 paper, some of which were only decided upon after the blind was broken. That means researchers knew which data belonged to the Paxil groups before they chose a method for determining whether the drug was effective.

'Commercially unacceptable' results

Study 329 may have obscured critical findings on Paxil users' suicidal tendencies using creative coding of results. In the study, "suicidal ideation/gestures" were reported under the label of "emotional lability," which Jureidini sharply called a "euphemism."

In total, Study 329's data showed that patients on Paxil were six times more likely to exhibit "emotional lability" than patients on placebo, and twice as likely than patients on imipramine, the other antidepressant tested in the study. Jureidini pointed out that the study failed to report the significance of those data, which were presented in a table but were not discussed in the text of the article.

Additionally, a GSK report on the study from 1998 identified at least three other patients who threatened suicide or had suicidal thoughts but were coded under "hostility," "worsening depression" or even "euphoria" and so were not grouped with emotionally labile patients. Juredini's calculations showed the serious adverse effects on Paxil to be significant over placebo."

The misrepresentation about the effectiveness of the drug is something that can't have been accidental," Jureidini said. The Herald has also obtained a copy of a 1998 GSK position piece marked "for internal use only," in which the company reacts to the findings of Study 329.

The memo says that Study 329's original standards used to measure drug efficacy were not met, but points to "trends in favour of paroxetine."

The document goes on to say that competitors Eli Lilly and Pfizer were making significant progress in testing their respective antidepressants, and concludes with the overall goal to "effectively manage dissemination of these data in order to minimise any potential negative commercial impact ... it would be commercially unacceptable to include a statement that efficacy had not been demonstrated."

By contrast, the company's promotional literature from 1999 trumpeted the efficacy of the product to physicians.And a 2001 internal memo from Paxil's product manager to sales representatives selling the drug asserted that Keller's "cutting-edge" study showed that "Paxil demonstrates REMARKABLE Efficacy and Safety in the treatment of adolescent depression."

'Potentially confusing' coding

There have also been more controversial allegations raised against Keller and his Study 329 co-authors, many of which appear in former Boston Globe reporter Alison Bass's book, "Side Effects: A Prosecutor, a Whistleblower and a Bestselling Antidepressant on Trial," which was released this summer. In it, Bass claims that Keller coded some suicidal patients as "non-compliant," which means that their adverse effects would not have been included in the article.

University officials would not release memos about the coding that Keller sent to the University's Institutional Review Board, which could serve to confirm or refute Bass's claims. But Donna Howard, an assistant administrator under Keller in the mid-1990s, said she had personally faxed those memos to the IRB.

"There was two or three (instances) where there was severe adverse reaction that brought the child into contact either with the police or a hospital, and the children that were involved were eventually dropped from the study and coded as non-compliant," Howard told The Herald.

She said the mood in her office at Butler Hospital would turn sour anytime a patient experienced a serious adverse effect.

"You would come in on Monday and it's, 'Oh no, patient so-and-so attempted suicide or hit a cop or overdosed,'" Howard said.

GSK's Director of U.S. Media Relations Sarah Alspach denied the claim that Study 329 underreported serious adverse effects, citing a 2002 clinical review of the study by the Food and Drug Administration, which "found no statistically significant signal for suicidality," Alspach wrote in an e-mail to The Herald.

Though the FDA review did not find a link in the study between Paxil and increased suicidal tendencies, it noted that researchers' coding of adverse reactions was "potentially confusing." The report also concluded that Study 329 was a "failed trial," because Paxil was not significantly more effective than placebo.

Two years later, the FDA issued a suicide warning for all selective serotonin reuptake inhibitors - the class of antidepressant to which Paxil belongs - after the British Medicines and Healthcare Products Regulatory Agency issued a similar warning earlier that year for paroxetine in the United Kingdom.

Then-New York Attorney General Eliot Spitzer sued GSK in June 2004, charging the company with consumer fraud and alleging that it had deliberately withheld data that showed that Paxil increased suicidal tendencies in adolescents. Spitzer's case targeted only the pharmaceutical company and did not investigate Brown's or Keller's involvement. GSK settled the suit for $2.5 million two months later but admitted no wrongdoing. As part of the settlement, GSK agreed to release all results from future clinical trials, whether negative or positive. Jureidini said he is confident that data in Study 329 were deliberately misrepresented but added that he can't definitively attribute the perceived misrepresentation of data to Keller."Whether Keller sat down with somebody and said 'Let's try to make this drug look good when really it's not,' is not something I have evidence for," he said.

Charges of ghostwriting

The issue of blame is also complicated by allegations made by Bass and others that Study 329 was ghostwritten by a GSK-affiliated employee. In any given clinical study with multiple authors, the actual article is usually written by one author and looked over by the others. In this case, there appears to be evidence that the article was drafted by Sally Laden, an editorial director for Scientific Therapeutics Information, the company that prepared the manuscript on GSK's behalf.

Alspach denied the ghostwriting charges but acknowledged Laden's contribution to the study, which was recognized with the line "editorial assistance was provided by Sally K. Laden" in the fine print of Study 329's first page.

But a leaked memo appears to paint Laden as the one who did the vast majority of the writing. Referring to the first draft of the manuscript, a letter from Keller to Laden dated Feb. 11, 1999, begins "Dear Sally, You did a superb job with this. ... It is excellent. Enclosed are rather minor changes from me."

Clinical Associate Professor of Community Health David Egilman '74 MD'78 said such work is unethical unless proper credit is given. That credit is missing in Study 329, he said."In the third grade you're told not to copy," he said. "Now that we're all grown up we've got a really long word for it, but it's the same thing and it's just as wrong."

Egilman noted that ghostwriting is not an entirely uncommon practice in writing up clinical studies. But it's still considered unethical, he added, especially when the ghostwriter has a stake in the findings.

Lack of U. discussion

Each allegation of scientific misconduct in Study 329 - the claimed ghostwriting, outcome measures switch and miscoding of suicidal patients - have led scientists to call for Brown to lead a public investigation into the issues."What I find most distressing is that there has been absolutely no attempt at Brown to even discuss these issues, much less have a forum or an investigation," said Clinical Associate Professor of Medicine Roy Poses '73 MD'78. "If Keller's actions have been exemplary and that's what everyone at Brown thinks, then they should go public and refute the charges. If they can't do that, the accusations are serious enough and they should address them."

"When they find out that there's been potentially ethically questionable research ... they're supposed to do a freaking investigation," Egilman said, adding that Keller should be able to present evidence on his behalf.Poses added that Brown's lack of public discussion of the study, despite widespread interest, is potentially embarrassing for the University. "Someone (at Brown) should be talking about it, because the rest of the world is talking about it," he said.

Jureidini agreed that Brown should investigate Keller's involvement. Study 329 "can only be interpreted as deliberately misrepresenting what was found," he said.A lawyer at Baum Hedlund - who is now representing the families of patients who claim to have been harmed by Paxil in class action lawsuits against GSK - said the University's attitude toward his firm's efforts has been "less than cooperative."

Lawyers for the University, George Murgatroyd added, have "fought us every inch of the way." Murgatroyd said Brown claims it no longer had the memos that Keller had sent to the IRB, Brown's research ethics panel.

The University, however, "can't discuss particular cases of possible claims of wrongdoing and what we do about them," Provost David Kertzer '69 P'95 P'98 said - ending the possibility of a public inquiry.

Source

2 comments:

Anonymous said...

Presently, for the treatment of depression and other mental disorders, some of these disorders are questionable regarding thier existence, the preferred choice of medicinal treatment are a class of medications called selective serotonin reuptake inhibitors, referred to as SSRIs, as they are the drugs of choice by most prescribers. Such meds, meds that affect the mind, are called psychotropic medications. SSRIs also include a few meds in this class with the addition of a norepinephrine uptake inhibitor added to the SSRI, and these are referred to SNRI medications. Examples of SNRIs are Effexor and Cymbalta. Presently, some compare the usage and popularity of these classes of meds as that of the usage of tranquilizers decades ago.

Some Definitions:

Serotonin is a neurotransmitter thought to be associated with mood. The hypothesis was first suggested in the mid 1960s that this neurotransmitter may play a role in moods and emotions in humans. Yet to this day, the serotonin correlation with such behavioral and mental conditions and diseases is only theoretical. In fact, the psychiatrist’s bible, which is called the DSM, states that the definite etiology of depression remains a mystery and is unknown. So a claim of a chemical imbalance in the brain as a reason for depression is not proven to be the cause of this and other mood disorders, it is only suspected based on limited science, which may or may not be valid. Observation by one's doctor is usually the determining factor for such a diagnosis.

Norepinephrine is a stress hormone, which many believe help those who have such mood disorders as depression. Perhaps this is now added to SSRIs for additional efficacy for those treated with these medications.

And depression is only one of those mood disorders, yet possibly the most devastating one. Once again, an accurate diagnosis of these mood conditions lack complete accuracy as they can only be defined conceptually, so the diagnosis is dependent on subjective criteria, such as questionnaires, as there is no diagnostic testing available to conclude objective diagnosis of such disorders. However, the diagnosis of depression in patients has increased quite a bit over the decades. While most likely a real disease, most will agree, misdiagnosis does occur due to the subjective assessment that determines the disease, as perhaps one out of every four people diagnosed with depression is inaccurate.

Several decades ago, less than 1 percent of the U.S. population were thought to have depression. Today, it is believed that about 10 percent of the population have depression at some time in their lives. Why this great increase in the growth in the assessment of this condition remains unknown and is subject to speculation. What is known is that the psychiatry specialty is the one specialty most paid to by certain pharmaceutical companies for various forms of support, as this industry clearly desires market growth of their psychotropic products, such as SSRIs, since clearly this is part of their nature and objective as a pharmaceutical company. Regardless, SSRIs and SRNIs are the preferred treatment methods if depression or other certain mood disorders that may be suspected by a doctor.

Over 30 million scripts of these types of meds are written annually, and the franchise is around 20 billion dollars a year, with some of the meds costing over 3 dollars per tablet. There are about ten different SSRI/SRNI meds available, many of which are now generic, yet essentially, they appear to be similar in regards to their efficacy and adverse events. The newest one, a SNRI called Pristiq, was approved this month and is expected to be promoted primarily for the treatment for menopause. Conversely, the first one of these SSRI meds was Prozac, which was available in 1988, and the drug was greatly praised for its ability to transform the lives of those who consumed this medication in the years that followed. Some termed Prozac, ‘the happy pill’. As years passed, this drug was preferred for children with depression. Also, a book was written praising Prozac as a euphoric entity for all to experience.

Furthermore, these meds have received additional indications for really questionable conditions, such as social phobia and premenstrual syndrome. With the latter, I find it hard to believe that a natural female experience can be considered a treatable disease. With social phobia, many would say that is a personality trait and, in my opinion, is synonomous with shyness, which probably should not be labeled a treatable disease as well. There are other indications for certain behavioral manifestations with the different SSRIs or SRNIs. So the market continues to grow with these meds- assisted by thier manufacturers. Yet, it is believed that these meds are effective in only about half of those who take them. Also, the makers of such meds create such conditions for utilization of these types of medications, in my opinion, and are active with related support groups who are funded by the makers of such drugs, such as sponsoring screenings for the indicated and not indicated conditions of their meds, including children and adolescents in particular, it is believed. Yet depression, which has clearly has been proven to be devastating to the victim, such screenings are controversial due to possible bias involved in seeking those with mental illness in this manner.

More concerning, however, is the adverse effects associated with SSRIs and SRNIs, which include suicidal thoughts and actions, as well as violence, including acts of homicide and aggression. The associations with these actions have been established with these types of meds. While most are approved for use in adults only, prescribing these meds to children and adolescents has drawn the most attention to others through the media. The reasons for this attention are the off-label use of these meds in this population, and the association with suicide. What may be most shocking is the fact that some of the makers of these meds did not release clinical study information about the risks of suicide as well as the other adverse events and true efficacy of certain types of SSRI meds, including the decreased efficacy of SSRIs, which is believed to be only less than 10 percent more effective than a placebo, until ultimately the makers of such drugs were forced to do so. Paxil, for example, caught the attention of the government regarding these issues some time ago for hiding and not presenting such important information to others, for example.

And there are very serious questions about the use of SSRIs in children and adolescents regarding the effects of these meds on them. For example, do the SSRIs correct or create brain states considered not within normal limits, which in effect may worsen thier mental state? Are adolescents depressed, or just experiencing what was once considered normal teenage angst? Do SSRIs have an effect on the brain development and their identity? Do adolescents in particular become dangerous or bizarre due to SSRIs interfering with the myelination occurring in their still developing brains? No one seems to know the correct answer to such questions, yet the danger associated with the use of SSRIs does in fact exist. It exists in some who take such meds, but not all who take these meds. Yet more need to be aware of such possibilities, some say.

Finally, if SSRIs are discontinued by those who have taken them for certain periods of time, withdrawals have been reported to be quite brutal, and may be a catalyst for suicide in itself, as not only are these meds habit- forming, but discontinuing these meds leaves the brain in a state of neurochemical instability, as the neurons are recalibrating upon discontinuation of the SSRI after being altered by the med to some degree. This occurs to some level with any psychotropic med, yet the withdrawals can reach a state of danger for the victim in some classes of meds such as the case with SSRIs.

SSRIs and SRNIs have been claimed by doctors and patients to be extremely beneficial for the patient’s well -being regarding the patient’s issues involved with thier mental illness suspected, such as depression, yet the risk factors associated with this class of medications may outweigh any perceived benefit for the patient taking such a drug, and this may want to be explored more by others. Considering the lack of efficacy that has been demonstrated objectively, along with the deadly adverse events with these meds only recently brought to the attention of others, other treatment options should probably be considered at the discretion of your prescriber.

“I use to care, but now I take a pill for that.” --- Author unknown

Dan Abshear

Fid said...

Top quality post Dan

Fid