Donald Garrity, "The Ketogenic Diet in Cancer Control," The ASCO Post, March 15, 2014
The article, which is not very long, summarizes research that has been done related to the ketogenic diet and myeloma. It is, in many places, relatively positive about the existing research, although it regularly notes that the findings are rather preliminary.
However, the article also closes with these statements,
Patients may decide to pursue the ketogenic diet on their own, assuming that, since it is “only” a diet, it can do little harm. However, patients undergoing chemotherapy may be at risk for malnourishment due to the side effects associated with their treatment.16 Introducing a restrictive diet may be potentially harmful.
Patients who are tolerating cancer treatment well or who are on a break from treatment may also be at risk for harmful effects from a ketogenic diet. The concern here is that the longer-term effects of a high-fat, very-low-carbohydrate diet that maintains a state of ketosis are unknown.
Given the absence of solid data on the merits and potential negative consequences, patients should pursue this diet only via participation in a clinical trial.
I'm not sure I would agree that with the suggestion that the diet should only be carried out as part of a clinical trial. It does seem to make sense, though, to do it with careful supervision of a doctor, which is what Cathy seems to be doing.