CD8+ TILS Expression in Invasive Breast Carcinoma (No Special Type)

Invasive breast carcinoma (IBC) is the most cancer in women (24%) and the cause of cancer death in women worldwide. Based on data from globocan 2018 shows the incidence of breast cancer is around 2.08 million (11.6%) which is the second rank of all cancers after lung cancer with a mortality rate of 626.6 thousand (6.6%) which is also the most common cause of death in women. The basic role of the immune system in maintaining homeostasis by immunosurveillance and initiation of the inflammatory reactions that include coordination of innate and adaptive immune cells activation against tumor cells is one of the most important in the mechanism of tumor cell elimination. Prognosis of IBC were influenced by several factors, including tumor histology grade and Tumor Infiltrating Lymphocytes (TILs). Infiltration of lymphocytes in the tumor microenvironment/TILs through CD8+ T lymphocytes is known to be an important component of adaptive immunity that eliminates tumor cells. CD8+ T cells present tumor antigens on the surface of the major histocompatibility complex class I (MHC class I). Based on its importance in clinical application and it's role in biological concepts, this study was conducted to determine the expression of CD8+ in Invasive Breast Carcinoma of No Special Type (IBC-NST) grades 1,2 and 3. Analytical study with a cross-sectional design on IBC-NST samples from 2017 until 2020 at the Laboratory of Anatomic Pathology, Faculty of Medicine, Hasanuddin University Makassar from May to August 2021. Immunoexpression data were analyzed to determine its relationship with grade. Eighty samples met the inclusion and exclusion criteria, there were 17 samples (21.3%) with grade 1, 32 samples (40%) with grade 2, and 31 samples (38.8%) with grade 3. In the high CD8+ TILs group, from a total of 27 samples, 10 samples with grade 1, 6 samples with grade 2, and as many as 11 samples with grade 3. In the low CD8+ TILs group, from a total of 53 samples, there were 7 samples with grade 1, 26 samples with grade 2, and 20 samples with grade 3. Based on the Chi-square test, p value = 0.017 (p <0.05). There is a significant difference in CD8+ TILS in Invasive Breast Carcinoma of No Special Type grade 1, grade 2 and grade 3.