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Purpose: Globally, breast cancer is the leading malignancy in females. Indeed, Asian cohorts show prevalence of breast cancer among women with ages below 40 years. Moreover, these younger cases are globally characterized by poorer prognostic features as well as survival outcomes, than older sufferers with ages above 40 years. Despite this, comparative analyses between older and younger cohorts are sparse from India, where data from the country's eastern part falls shortest. This study attempted a comprehensive analysis of breast cancer between these two cohorts representing the Eastern Indian subcontinent. Methods: Documenting retrospective case-files registered between 2010 and 2015, 394 cases of younger (<40 years) and 1250 older (=40 years) sufferers of primary breast cancer were noted. The relevant features and follow-up information were also retrieved. Kaplan-Meier analyses were performed to evaluate the survival outcome. Results: The data, in general, revealed a high percentage of younger sufferers from Eastern Indian regions. Moreover, this younger cohort showed poor survival. Among the younger cohort, cases with poor pathological features (triple negative, node-positive, grade III) were proportionately higher than the older cohort. Indeed, survival among these categories scored significantly low, compared to the older cohort. Conclusion: This Eastern Indian subcontinental data matched the analyses from other parts of India as well as Asian data and clearly showed the prevalence of younger sufferers of breast cancer with poor clinico-pathological features and survival outcomes. Impact: Analyzing age-based features and outcomes from Eastern India, this study provides data in supplementing Indian and Asian scenarios of breast cancer. [ABSTRACT FROM AUTHOR]