That's a really small sample size. Are they allowed to publish a study like this for such a small sample? Does anyone know if there is a minimum threshold size?
Allowed to publish? First it's a pilot study. Second, it's actually not a small sample size if you reasonably anticipate big effects and have multiple measures for each of the people at multiple time points. It isn't an observational study, though believers might have wished for a matched control group - - the anticancer effects might have come from the Ramadan prayer vs fasting!