Tumor-infiltrating platelets predict postoperative recurrence and survival in resectable pancreatic neuroendocrine tumor

Figure 1 Representative microphotographs of CD42b staining. A: Positive, CD42b expression aggregating around and embracing tumor cells; B: Positive, CD42b expression surrounding tumor cells and intratumoral blood vessels; C: Negative, no CD42b staining in intratumoral region; D: Negative, CD42b staining only in intratumoral vessels. All magnifications × 400. Positive staining appears brown.