Search and inclusion/exclusion criteria of the studies. The flowchart depicts search criteria used to select the studies with breast cancer cohorts of Indian and/or Indian-origin patients. Exclusion and inclusion criteria are explained and led to the inclusion of 34 studies in the systematic review. ER, estrogen receptor; HER2, human epidermal growth factor receptor 2, IHC, immunohistochemistry; PR, progesterone receptor; PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses; TNBC, triple-negative breast cancer.