Mammary-type myofibroblastoma with infarction and atypical mitosis-a potential diagnostic pitfall: A case report

Figure 4 Immunohistochemical findings in the tumor. A: Cells showed strongly positive staining for cluster of differentiation (CD) 34; B: Cells showed strongly positive staining for desmin; C: Lost expression of retinoblastoma 1 protein, with positive internal-control staining for lymphocytes; D: Staining was positive for estrogen receptor; E: Staining was positive for epithelial-membrane antigen; F: Staining was positive for murine double minute 2; G: Staining was positive for cyclin-dependent kinase 4; H: Staining was negative for S100; I: Staining was negative for smooth muscle actin; J: Staining was negative for signal transducer and activator of transcription 6; K: Staining was negative for CD117. Note that positive staining for CD117 appeared in the mast cells of the internal control; L: Ki-67 index was about 5%.