National Journal of Laboratory Medicine (Jan 2024)
Role of HER2/neu in Colorectal Carcinoma: A Cross-sectional Study from a Tertiary Care Centre in West Bengal, India
Abstract
Introduction: In many tumours, Human Epidermal Growth Factor Receptor 2 (HER2) expression and HER2 amplification are studied as therapeutic and prognostic factors. The incidence of HER2/neu expression and its consequences in patients with colorectal carcinoma has shown conflicting evidence. Aim: To evaluate the utility of HER2/neu expression in colorectal carcinoma and to find any association between HER2/neu expression, histological grade, and stage of the tumour. Materials and Methods: This cross-sectional study was conducted on 50 cases of colorectal carcinoma. Patients undergoing surgery for colorectal tumours were selected over an 18-month period (January 2020 to June 2021) in a tertiary care hospital in Kolkata, West Bengal, India. Various clinical and demographic parameters were obtained from the patients, and the specimens were subjected to Immunohistochemical (IHC) staining for HER2/neu. The results were analysed using Statistical Package for the Social Sciences (SPSS) software version 25.0 (IBM, Armonk, New York, USA). Results: On HER2/neu IHC examination, 30 cases (60%) showed a 3+ score, 4 cases (8%) showed a 2+ score, 7 cases (14%) showed a 1+ score, and the remaining 9 cases (18%) showed a score of 0. HER2/neu expression was found in 30 cases (60%) of colorectal carcinoma. HER2/neu expression showed a significant association with the histological grade of the tumour (p-value=0.020). HER2/neu expression also showed a significant association (p-value <0.001) with histological subtypes of the tumour. Conclusion: This study revealed a significant association between HER2/neu expression and histological subtypes and grade of the tumour. Moderately differentiated adenocarcinoma showed the highest expression, while mucinous adenocarcinoma and undifferentiated carcinoma showed minimal or absent HER2/neu expression. Thus, HER2/neu can serve as a prognostic and therapeutic marker in colorectal carcinoma. In conclusion, surgery alone is not curative for patients with colorectal cancer, and additional forms of management may be required to improve patient survival. In such cases, HER2/neu expression can guide new adjuvant therapy.
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