Molecular subtypes of breast carcinoma and its relation with clinicopathological features: A single-center initial experience

Molecular subtypes of breast carcinoma and its relation with clinicopathological features: A single centre initial experience. Background: Breast carcinoma is the most common malignancy in female in the world. They are a group of heterogenous diseases with diverse clinical, morphological and gene expression profile. Molecular subtyping of histological types of breast carcinomas based on the expression receptors estrogen receptors (ER), progesterone receptors (PR), HER2 neu and Ki67 act as a surrogate marker for gene expression profiling. This helps in specific prognostic and predictive targeted therapy. Objective: Identification of various molecular subtypes and correlate with the clinicopathological parameters. Methods: This cross sectional study comprising of thirty four cases is conducted at Department of Pathology, Regional Institute of Medical Sciences, Imphal during a period of three years from August 2016 to July 2019. The histomorphological diagnosis and clinical parameters are correlated with immunohistochemical findings for ER, PR, Her2 Neu and Ki 67. Statistical analysis done by chi square test. Results: The commonest histological type is invasive carcinoma of no special type (88.2%). After molecular sub typing, Luminal B type (LUMB) is the most common type (38.2%). LUMA type found to be associated with smaller tumor size, grade 1-2 and seen mainly in 6rd and 7th decade of life. LUMB and Her-2 Neu enriched, triple negative type commonly associated with larger tumor size, grade 2-3 and seen in 4th to 6th decade of life. Conclusion: Some differences in clinicopathological profile of the molecular subtypes from other studies seen. A larger multicentric study with genetic analysis will help in understanding the disease pattern in our area helping in targeted and personalized treatment.