In alternative medicine, good evidence is like gold dust and good evidence showing that alternative therapies are efficacious is even rarer. Therefore, I was delighted to come across a brand-new article from an institution that should stand for reliable information: the NIH, no less.
According to its authors, this new article “examines the clinical trial evidence for the efficacy and safety of several specific approaches—acupuncture, manipulation, massage therapy, relaxation techniques including meditation, selected natural product supplements (chondroitin, glucosamine, methylsulfonylmethane, S-adenosylmethionine), tai chi, and yoga—as used to manage chronic pain and related disability associated with back pain, fibromyalgia, osteoarthritis, neck pain, and severe headaches or migraines.”
The results of this huge undertaking are complex, of course, but in a nutshell they are at least partly positive for alternative medicine. Specifically, the authors state that “based on a preponderance of positive trials vs negative trials, current evidence suggests that the following complementary approaches may help some patients manage their painful health conditions: acupuncture and yoga for back pain; acupuncture and tai chi for OA of the knee; massage therapy for neck pain with adequate doses and for short-term benefit; and relaxation techniques for severe headaches and migraine. Weaker evidence suggests that massage therapy, SM, and osteopathic manipulation might also be of some benefit to those with back pain, and relaxation approaches and tai chi might help those with fibromyalgia.”
This is excellent news! Finally, we have data from an authoritative source showing that some alternative treatments can be recommended for common pain conditions.
Hold on, not so fast! Yes, the NIH is a most respectable organisation, but we must not blindly accept anything of importance just because it appears to come form a reputable source. Let’s look a bit closer at the actual evidence provided by the authors of this paper.
Reading the article carefully, it is impossible not to get troubled. Here are a few points that concern me most:
- the safety of a therapy cannot be evaluated on the basis of data from RCTs (particularly as it has been shown repeatedly that trials of alternative therapies often fail to report adverse effects); much larger samples are needed for that; any statements about safety in the aims of the paper are therefore misplaced;
- the authors talk about efficacy but seem to mean effectiveness;
- the authors only included RCTs from the US which must result in a skewed and incomplete picture;
- the article is from the National Center for Complementary and Integrative Health which is part of the NIH but which has been criticised repeatedly for being biased in favour of alternative medicine;
- not all of the authors seem to be NIH staff, and I cannot find a declaration of conflicts of interest;
- the discussion of the paper totally lacks any critical thinking;
- there is no assessment of the quality of the trials included in this review.
My last point is by far the most important. A summary of this nature that fails to take into account the numerous limitations of the primary data is, I think, as good as worthless. As I know most of the RCTs included in the analyses, I predict that the overall picture generated by this review would have changed substantially, if the risks of bias in the primary studies had been accounted for.
Personally, I find it lamentable that such a potentially worthy exercise ended up employing such lousy methodology. Perhaps even more lamentable is the fact that the NIH (or one of its Centers) can descend that low; to mislead the public in this way borders on scientific misconduct and is, in my view, unethical and unacceptable.