“The key criticism of this systematic review is inherent in its method because studies with different designs were grouped together,” Graham Roberts, MD, and Elizabeth Angier, MD, wrote in an accompanying editorial. In addition, the studies chosen did not account for the development of long-term peanut tolerance after the therapy was discontinued.

Also, the researchers did not factor in the variation in patterns of anaphylactic events, with patients in the treatment groups having events at home in conjunction with daily peanut doses, while the control patients would have had events mainly away from home.

“Unfortunately, the trials have not provided information about which participants benefited most from the intervention,” they wrote.

“Trading treatment-related side effects at home for allergic reactions to accidental exposures out of the house [i.e., in social situations] might beneficial for some patients,” they added. However, more research is needed to determine which patients would benefit from different treatment options at home and outside the home. The less effective but safer option of epicutaneous immunotherapy might be preferred by some patients. And early introduction of peanut products during infancy may prevent many cases of peanut allergy.

Dr. Roberts and Dr. Angier are at the University of Southampton (England). Both are members of the European Academy of Allergy and Clinical Immunology Allergen Immunotherapy Guidelines Group, which has recently published guidelines on immunotherapy. They wrote an editorial to accompany the article by Chu et al (Lancet. 2019 June 1;393:2180-1). They had no financial conflicts to disclose.