Fig. 1.

Examples of partially positive staining for each immunohistochemical marker. (A) CD10 staining showing a positive reaction in a small proportion of the tumor cells (about 20%), which is considered to be a negative result in all 4 algorithms (×100). (B) MUM1 staining exhibiting reactivity in about 40% of tumor cells, which is considered to be positive in the Hans and Tally algorithms but negative in the Choi algorithm (×100). (C) GCET1 positive staining in some tumor cells (about 30%), which is considered to be a negative result in the Choi algorithm (×100). (D) LMO2 positive staining in scattered tumor cells with anaplastic nuclei (about 20%) (×100).