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Figure 1: Human epidermal growth factor receptor 2 expression on immunohistochemistry: 3+ (strong, complete, basolateral, or lateral membranous reactivity in ≥10% of tumor cells) (a) 2+ (weak to moderate, complete, basolateral, or lateral membranous reactivity in ≥10% of tumor cells) (b) 1+ (faint or barely perceptible reactivity in ≥10% of tumor cells; cells are reactive only in part of their membrane) (c) 0 (no reactivity or membranous reactivity in <10% of tumor cells) (d) (×400)

Figure 1: Human epidermal growth factor receptor 2 expression on immunohistochemistry: 3+ (strong, complete, basolateral, or lateral membranous reactivity in ≥10% of tumor cells) (a) 2+ (weak to moderate, complete, basolateral, or lateral membranous reactivity in ≥10% of tumor cells) (b) 1+ (faint or barely perceptible reactivity in ≥10% of tumor cells; cells are reactive only in part of their membrane) (c) 0 (no reactivity or membranous reactivity in <10% of tumor cells) (d) (×400)