You may feel that homeopaths are bizarre, irrational, perhaps even stupid – but you cannot deny their tenacity. Since 200 years, they are trying to convince us that their treatments are effective beyond placebo. And they seem to get more and more bold with their claims: while they used to suggest that homeopathy was effective for trivial conditions like a common cold, they now have their eyes on much more ambitious things. Two recent studies, for instance, claim that homeopathic remedies can help cancer patients.
The aim of the first study was to evaluate whether homeopathy influenced global health status and subjective wellbeing when used as an adjunct to conventional cancer therapy.
In this pragmatic randomized controlled trial, 410 patients, who were treated by standard anti-neoplastic therapy, were randomized to receive or not receive classical homeopathic adjunctive therapy in addition to standard therapy. The main outcome measures were global health status and subjective wellbeing as assessed by the patients. At each of three visits (one baseline, two follow-up visits), patients filled in two questionnaires for quantification of these endpoints.
The results show that 373 patients yielded at least one of three measurements. The improvement of global health status between visits 1 and 3 was significantly stronger in the homeopathy group by 7.7 (95% CI 2.3-13.0, p=0.005) when compared with the control group. A significant group difference was also observed with respect to subjective wellbeing by 14.7 (95% CI 8.5-21.0, p<0.001) in favor of the homeopathic as compared with the control group. Control patients showed a significant improvement only in subjective wellbeing between their first and third visits.
Our homeopaths concluded that the results suggest that the global health status and subjective wellbeing of cancer patients improve significantly when adjunct classical homeopathic treatment is administered in addition to conventional therapy.
The second study is a little more modest; it had the aim to explore the benefits of a three-month course of individualised homeopathy (IH) for survivors of cancer.
Fifteen survivors of any type of cancer were recruited by a walk-in cancer support centre. Conventional treatment had to have taken place within the last three years. Patients scored their total, physical and emotional wellbeing using the Functional Assessment of Chronic Illness Therapy for Cancer (FACIT-G) before and after receiving four IH sessions.
The results showed that 11 women had statistically positive results for emotional, physical and total wellbeing based on FACIT-G scores.
And the conclusion: Findings support previous research, suggesting CAM or individualised homeopathy could be beneficial for survivors of cancer.
As I said: one has to admire their tenacity, perhaps also their chutzpa – but not their understanding of science or their intelligence. If they were able to think critically, they could only arrive at one conclusion: STUDY DESIGNS THAT ARE WIDE OPEN TO BIAS ARE LIKELY TO DELIVER BIASED RESULTS.
The second study is a mere observation without a control group. The reported outcomes could be due to placebo, expectation, extra attention or social desirability. We obviously need an RCT! But the first study was an RCT!!! Its results are therefore more convincing, aren’t they?
No, not at all. I can repeat my sentence from above: The reported outcomes could be due to placebo, expectation, extra attention or social desirability. And if you don’t believe it, please read what I have posted about the infamous ‘A+B versus B’ trial design (here and here and here and here and here for instance).
My point is that such a study, while looking rigorous to the naïve reader (after all, it’s an RCT!!!), is just as inconclusive when it comes to establishing cause and effect as a simple case series which (almost) everyone knows by now to be utterly useless for that purpose. The fact that the A+B versus B design is nevertheless being used over and over again in alternative medicine for drawing causal conclusions amounts to deceit – and deceit is unethical, as we all know.
My overall conclusion about all this:
QUACKS LOVE THIS STUDY DESIGN BECAUSE IT NEVER FAILS TO PRODUCE FALSE POSITIVE RESULTS.