This nicely written article describes the highs and lows of a patient treated with the “smart” drug Gleevec, used to fight a rare form of fatal leukemia known as CML as well as a rare cancer known as gastrointestinal stromal tumor (GIST) that is caused by a mutation in a gene named kit. The author, a physician and former president of the Dana Farber Cancer Institute, notes that Gleevec was developed to treat metastatic stromal tumors that have spread throughout the body and do not respond to surgical resection, radiation, or more-standard chemotherapies. He briefly summarizes the history of this drug and its place in current cancer treatment. This approach (a "My Perspective" piece written by a physician)—telling the compelling story of a drug and of a difficult cancer through the unfolding case of a single patient—can have its strengths and weaknesses. In this instance, one strength is that readers get a feel for what it might be like to live on the roller-coaster of a terrible disease as new therapies attempt to smooth out the rough ride. Unfortunately, the story lacks important information that would help readers assess the evidence on this therapy, its potential harms, and its cost-effectiveness. According to the best available evidence, the drug is capable of dramatically shrinking (by about 50%) kit-positive GIST in about half of patients who take it, apparently including the type of patient profiled in this piece. Yet we do not learn this when we read the story. Moreover, “smart” drugs that attempt to spare healthy cells as they kill cancer cells have costs—both in side effects and dollars. Though most patients seem to tolerate Gleevec well, the article does not mention recently reported harms of the medication. (See “Harms of Treatment” above.) Nor does it mention its financial costs. As a staff-written article in the previous day’s edition of the Boston Globe explained, “smart” drugs are very expensive ($3000 to $8000 per month for breast and lung cancer drugs, respectively). Indeed, the earlier Globe article cautions that such high costs are an important consideration and could divide cancer patients of the future into “haves” and “have-nots.” But if people didn't read the previous article and only read this, they learned nothing of cost.
Though a staff-written article in the previous day’s edition of the Boston Globe explained that “smart” drugs are very expensive ($3000 to $8000 per month for breast and lung cancer drugs, respectively), this article failed to mention cost. The earlier Globe article cautioned that such high costs are an important consideration and could divide cancer patients of the future into “haves” and “have-nots.” (See http://www.boston.com/yourlife/health/diseases/articles/2007/03/12/a_moving_target/?page=1). But if you only saw this story, you didn't learn about costs.
The article does not provide estimates of Gleevec’s absolute or relative benefits. A recent systematic review concluded that about half of patients taking Gleevec who have advanced unresectable and/or metastatic, KIT-positive GIST (like the patient in the Globe story) will experience a dramatic shrinkage of the tumor (at least a 50% reduction), though it is not possible to predict which patients will respond well. (Health Technol Assess. 2005;9:1-142.)
The article explains that Gleevec and other “smart” cancer drugs “destroy cancer cells yet cause minimal damage to normal cells.” Though most patients seem to tolerate the drug well, the article does not mention recently reported harms of the medication. According to a recent systematic review, "all Gleevec-treated patients experienced adverse effects.” (Health Technol Assess. 2005;9:1-142.) The most serious events are tumor hemorrhage in some 5% of patients. Common serious events include gastrointestinal complications (bleeding, obstruction, perforation, or rupture) and low white blood cell counts. Other common side effects include swelling from fluid (edema), nausea, diarrhea, and muscle pain. Some patients taking Gleevec for gastrointestinal stromal tumors or chronic myelogenous leukemia (CML) may also develop low phosphate levels, or hypophosphate, perhaps from accelerated vitamin D metabolism. (N Engl J Med 2006; 354:2006-13) Left untreated, chronic hypophosphate can impair the ability of bone to renew itself, or lead to rickets and osteomalacia (a painful condition characterized by soft bone that easily bends). A case study reported that a patient taking Gleevec developed a blood clot in the pelvis that moved to the lung, a rare but fatal event. (J Exp Clin Cancer Res. 2006;25:607-10.)
The article does not sufficiently explain the nature or quality of the clinical evidence to support the use of Gleevec in patients with GIST. According to a recent systematic review, there are “no randomized trials that have directly compared [Gleevec] with the current standard treatment in patients with advanced GIST.” Moreover, the reviewers added, “There are many uncertainties surrounding [Gleevec] prescription, such as the length of time patients should be on [Gleevec], the dose, drug resistance and the optimum time-point in the disease course at which to give the drug.” (Health Technol Assess. 2005;9:1-142.) As the Globe article implies, it is also unknown how many months or years Gleevec may extend the life of patient.
There are no obvious elements of disease-mongering. However, few will face the prospect of tumor cells spilling into the abdomen. One recent estimate put the annual incidence of GIST at about 5000-6000 cases per year.
The author of this article is a physician and former president of the Dana Farber Cancer Institute. He states that Dana Farber was the site of a clinical trial with Gleevec. The article does not disclose potential conflicts of interest. Though it mentions researcher-oncologist George Dmitri, it does not cite independent sources.
Though sketchy, the article summarizes in a half-sentence other treatment options. It does not quantify their risks or benefits.
A reader could reasonably infer that the drug Gleevec is approved for the treatment of gastrointestinal stromal tumor (GIST) and that the drug is available to patients seeking care from a cancer specialist.
The story nicely summarizes the history of “smart” drug development–“stretched over many decades.”
It does not appear that the story relied solely or largely on a news release.
Comments
Please note, comments are no longer published through this website. All previously made comments are still archived and available for viewing through select posts.
Our Comments Policy
But before leaving a comment, please review these notes about our policy.
You are responsible for any comments you leave on this site.
This site is primarily a forum for discussion about the quality (or lack thereof) in journalism or other media messages (advertising, marketing, public relations, medical journals, etc.) It is not intended to be a forum for definitive discussions about medicine or science.
We will delete comments that include personal attacks, unfounded allegations, unverified claims, product pitches, profanity or any from anyone who does not list a full name and a functioning email address. We will also end any thread of repetitive comments. We don”t give medical advice so we won”t respond to questions asking for it.
We don”t have sufficient staffing to contact each commenter who left such a message. If you have a question about why your comment was edited or removed, you can email us at feedback@healthnewsreview.org.
There has been a recent burst of attention to troubles with many comments left on science and science news/communication websites. Read “Online science comments: trolls, trash and treasure.”
The authors of the Retraction Watch comments policy urge commenters:
We”re also concerned about anonymous comments. We ask that all commenters leave their full name and provide an actual email address in case we feel we need to contact them. We may delete any comment left by someone who does not leave their name and a legitimate email address.
And, as noted, product pitches of any sort – pushing treatments, tests, products, procedures, physicians, medical centers, books, websites – are likely to be deleted. We don”t accept advertising on this site and are not going to give it away free.
The ability to leave comments expires after a certain period of time. So you may find that you’re unable to leave a comment on an article that is more than a few months old.
You might also like