The cytoplasm of the tumor cells with peripheral displacement of the nucleus was immunoreactive for low-molecular-weight keratins, CAM 5.2, and patchy reactive for CK7 (Fig. 3D and 3E), but not for CK5/6, CK 8, CK 20, and CK 34βE12, supporting the exclusion of paragangliomas. This evidence concerns the gene KRT7 and neoplasm.