The HER2 and EGFR expression of tumor xenografts in NOD-SCID mice established by the s.c. inoculation of SK-OV-3 or MDA-MB-468 cells or a mixture of SK-OV-3 cells (30%) and MDA-MB-468 cells (70%) at 6 weeks post-inoculation were assessed by flow cytometry of the dissociated tumor cells. Here, EGFR is linked to neoplasm.