Predictive value of biological markers in loco-regional recurrence of breast cancer after mastectomy and radiotherapy

Objective To assess the prognostic usefulness of the human epidermal growth factor receptor-2 (Her 2), the progestin receptor (PR), and the oestrogen receptor (ER) in locoregional recurrence following mastectomy radiotherapy in Egyptian breast cancer patients. Patients and methods This retrospective analysis comprised 432 female patients who had received radiation and had a mastectomy and immunohistochemistry reports. The Ethics Committee’s clearance was required before this study could be carried out at the Ain-Shams University hospitals. Results A total of 24 individuals developed LRR after a median follow-up period of 68.9 months. Although lymph nodes with more than three exhibited a statistically significant risk for LLR, tumour grade and pT were not significant risk factors. LRR risk rose for those who were HER2-positive and those with TNBC, but Luminal B had a non-significantly greater risk than Luminal A. Conclusion For breast cancer patients receiving PMRT, the biological subtype based on the categorization standard from the St. Gallen International Breast Cancer Conference (2013) Expert Panel acts as an accurate prognostic predictor. In HER2-positive and hormonal receptor-positive individuals, trastuzumab treatment significantly reduced the risk of LRR.