Prognostic Significance and Molecular Classification of Triple Negative Breast Cancer: A Systematic Review

I appreciate Dogra et al. ( 1) for their systematic review on the prognostic significance and molecular classification of triple-negative breast cancer (TNBC).It takes a lot of time and effort to collect and analyse this amount of data.The results provide valuable insight into different subtypes of TNBC along with their prognosis.However, I wish to bring your attention to some of the issues in the methodology and data extraction.Systematic reviews and meta-analyses are generally not included in conducting systematic reviews as these are secondary data, unless it's a "meta-meta-analysis" or "review of review".Alternatively, if systematic reviews are included, then studies of the same period should be excluded from the search.Where the authors did mention that review articles were to be excluded, the inclusion criteria included systematic reviews and meta-analyses.