Test Catalog

Test ID: PAX2    
PAX2 Immunostain, Technical Component Only

Useful For Suggests clinical disorders or settings where the test may be helpful

Aids in the diagnosis of endocervical adenocarcinoma and renal cell carcinoma 

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

Paired box gene 2 (PAX2) is a nuclear transcription factor.  Expression of PAX2 and PAX8 is useful in the diagnosis of renal cell carcinoma.  Loss of PAX2 expression is useful in the diagnosis of endocervical adenocarcinoma.

Interpretation Provides information to assist in interpretation of the test results

This test includes only technical performance of the stain (no pathologist interpretation is performed). Mayo Clinic cannot provide an interpretation of tech only stains outside the context of a pathology consultation. If an interpretation is needed, refer to PATHC / Pathology Consultation for a full diagnostic evaluation or second opinion of the case. All material associated with the case is required. Additional specific stains may be requested as part of the pathology consultation, and will be performed as necessary at the discretion of the Mayo pathologist.


The positive and negative controls are verified as showing appropriate immunoreactivity. If a control tissue is not included on the slide, a scanned image of the relevant quality control tissue is available upon request; contact 855-516-8404.


Interpretation of this test should be performed in the context of the patient's clinical history and other diagnostic tests by a qualified pathologist.

Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

Age of a cut paraffin section can affect immunoreactivity. Stability thresholds vary widely among published literature and are antigen-dependent. Best practice is for paraffin sections to be cut within 6 weeks.

Clinical Reference Recommendations for in-depth reading of a clinical nature

1. Rabban J, McAlhany S, Lerwill M, et al: PAX2 Distinguishes Benign Mesonephric and Mullerian Glandular Lesions of the Cervix From Endocervical Adenocarcinoma, Including Minimal Deviation Adenocarcinoma. Am J Surg Pathol 2010;34(2):137-146

2. Ozcan A, Roza G, Ro J, et al: PAX2 and PAX8 Expression in Primary and Metastatic Renal Tumors: A Comprehensive Comparison. Arch Pathol Lab Med 2012;136(12):1541-1551

3. Knoepp S, Kunju L, Roh M: Utility of PAX8 and PAX2 immunohistochemistry in the identification of renal cell carcinoma in diagnostic cytology. Diagn Cytopathol 2012;40(8):667-672

4. Shukla A, Thomas D, Roh M: PAX8 and PAX2 expression in endocervical adenocarcinoma in situ and high-grade squamous dysplasia. Int J Gynecol Pathol 2013;32(1):116-1121