Relationships among KRAS mutation status, expression of RAS pathway signaling molecules, and clinicopathological features and prognosis of patients with colorectal cancer

Figure 2 Expression of RAS pathway proteins in colorectal cancer. A-D: KRAS negative (A and B) and positive (C and D) expression at magnification × 40 (A and C) and × 100 (B and D). E-P: As described for (A-D), except that staining for BRAF protein (E-H), MEK protein (I-L), and ERK protein (M-P) is shown.