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        Analysis Natrium Iodide Symporter Expression in Breast Cancer Subtypes for Radioiodine Therapy Response

        Aisyah Elliyanti,Dewi Rusnita,Nita Afriani,Yayi Dwina Billianti Susanto,Veronica Y. Susilo,Sri Setiyowati,Wirsma Arif Harahap 대한핵의학회 2020 핵의학 분자영상 Vol.54 No.1

        Purpose This study investigates natrium iodide symporter (NIS) expression in three breast cancer subtypes to predict radioiodine response. Materials and Methods Frozen breast tissues from triple negative (TN), human epidermal receptor 2 (HER2+), and luminal A cancers were used in this research. NIS protein expression in each subtype was analyzed using immunohistochemistry (IHC) and western blot (WB). Secondary data such as age, subtypes, and Ki 67 index were drawn from the surgical oncologist database. Breast cancer cell lines were used to investigate the effect of radioiodine by measuring cell proliferation. Results The forty-one breast cancer samples were analyzed consisted of the following subtypes: TN, HER2+, and luminal Awere 58%, 22%, and 20%respectively. The stages of disease were 2A to 4A. Most of samples were at 3B. Ki 67 index of TN, HER2+, and luminalAwere 21 ± 12, 19 ± 5, and 7 ± 3 respectively. The NIS expressionwas detected in 95%of samples in cytoplasmand/ or cell membrane; 93% of samples were invasive breast carcinomas. Only 20% of the samples showed NIS expression at cell membrane; four samples were HER2+, and other four were TN subtypes. NIS membrane score was significantly positively correlated with Ki67 index, p = 0.04. NIS protein expression was detected at sizes 88 kDa, 50 kDa, and 27 kDa. Cell proliferation rate means of MDA-MB 231, SKBR3, and MCF7 cells were 81.6 ± 4, 10.6 ± 5, and 15.4 ± 13 respectively (p = 0.009). Conclusion NIS protein expression is detectable in breast cancer cells to varying degrees. HER2+ is the most likely to express NIS in the cell membrane followed by TN subtypes. This indicates that radioiodine could be used as a novel adjuvant treatment in breast cancer.

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