Kir7.1 immunoreactivity in canine choroid plexus tumors
Eun Ju Choi1, Erica A Sloma1, Andrew D Miller2
1Section of Anatomic Pathology, Department of Biomedical Sciences, Cornell University, College of Veterinary Medicine, Ithaca, NY.
Summary
Kir7.1 is a highly effective marker for identifying canine choroid plexus tumors (CPTs). This study found Kir7.1 robustly expressed in CPTs but not in most other brain tumors, aiding diagnosis.
Area of Science:
- Veterinary Pathology
- Neuro-oncology
- Molecular Diagnostics
Background:
- Choroid plexus neoplasms (CPNs) are rare canine brain tumors.
- Current markers like pan-cytokeratin show heterogeneous expression in CPNs.
- Kir7.1 is a promising diagnostic marker for human CPNs.
Purpose of the Study:
- To evaluate Kir7.1 expression in normal canine brain and various brain tumors.
- To determine the diagnostic utility of Kir7.1 for canine choroid plexus tumors (CPTs).
Main Methods:
- Immunohistochemical analysis of Kir7.1 in normal canine brain tissue.
- Analysis of Kir7.1 expression in canine gliomas, ependymomas, CPTs, meningiomas, and carcinomas.
- Evaluation of staining patterns, including membrane and cytoplasmic localization.
Main Results:
- Robust apical membrane and cytoplasmic Kir7.1 immunoreactivity was observed in all 12 canine CPTs.
- Most other canine brain tumors (gliomas, meningiomas) showed no Kir7.1 immunoreactivity.
- One ependymoma and one nasal carcinoma exhibited moderate, non-apical Kir7.1 staining.
Conclusions:
- Kir7.1 demonstrates high diagnostic specificity for canine choroid plexus tumors (CPTs).
- The distinctive apical staining pattern of Kir7.1 aids in differentiating CPTs from other canine brain neoplasms.
- Kir7.1 is proposed as an excellent immunohistochemical marker for canine CPTs.
