Inhibin Alpha Expression in Human Tumors: A Tissue Microarray Study on 12,212 Tumors

Area of Science:

• Oncology
• Pathology
• Cancer Research

Background:

• Inhibin alpha (INHA) serves as an immunohistochemical marker for specific neoplasms.
• Expression of INHA is observed in normal cell types, including those in the adrenal cortex, ovaries, and testes.
• Previous studies established INHA as a marker for adrenocortical neoplasms and sex cord stromal tumors.

Purpose of the Study:

• To comprehensively evaluate INHA expression across a wide range of human cancers.
• To determine the diagnostic utility of INHA immunohistochemistry in various tumor types.
• To assess the potential of INHA as a reliable biomarker in oncology.

Main Methods:

• Analysis of a large-scale tissue microarray (15,012 samples) representing 134 tumor types and subtypes.
• Utilized immunohistochemistry to detect and quantify INHA expression.
• Correlated INHA positivity with specific tumor diagnoses.

Main Results:

• INHA positivity was detected in 72 out of 134 tumor categories.
• Strong INHA expression was notably high in ovarian granulosa cell tumors (100%), other ovarian/testicular sex cord stromal tumors (100%), and granular cell tumors (100%).
• Moderate to strong INHA expression was also observed in adrenocortical carcinomas (44%) and pancreatic acinar cell carcinomas (46.7%).

Conclusions:

• INHA is a valuable marker for identifying sex cord stromal tumors, granular cell tumors, and adrenocortical neoplasms.
• The presence of INHA in diverse tumor types necessitates its use within a broader immunohistochemical panel for accurate differential diagnosis.
• Further research may refine the role of INHA in specific cancer subtyping and prognostication.