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Figure 2: Immunohistochemical analysis of estrogen receptor/progesterone receptor/human epidermal growth factor receptor-2. Representative immunohistochemical micrographs of four tumor tissues showing the absence of ER, PR, and human epidermal receptor-2 (HER2) proteins. Positive reactions of estrogen receptor/progesterone receptor antibodies used for this technique were observed as inbuilt positive nonmalignant cells, and a separate positive control section shows human epidermal growth factor receptor-2 reactivity

Figure 2: Immunohistochemical analysis of estrogen receptor/progesterone receptor/human epidermal growth factor receptor-2. Representative immunohistochemical micrographs of four tumor tissues showing the absence of ER<sup>−</sup>, PR<sup>−</sup>, and human epidermal receptor-2 (HER2<sup>−</sup>) proteins. Positive reactions of estrogen receptor/progesterone receptor antibodies used for this technique were observed as inbuilt positive nonmalignant cells, and a separate positive control section shows human epidermal growth factor receptor-2 reactivity