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Abnormal Proliferation

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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...

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Updated: Nov 16, 2025

The In ovo CAM-assay as a Xenograft Model for Sarcoma

The In ovo CAM-assay as a Xenograft Model for Sarcoma

Published on: July 17, 2013

INSM1 Expression in Chordomas.

Maroa Dridi¹, Jean Boutonnat², Jean Marc Dumollard¹

¹Pathology Department, University Hospital of Saint-Etienne, Saint-Etienne, France.

American Journal of Clinical Pathology

|February 25, 2021

Summary

This summary is machine-generated.

Insulinoma-associated protein 1 (INSM1) is rarely expressed in chordomas, a rare malignant tumor. This finding questions the utility of INSM1 as a diagnostic marker for neuroendocrine differentiation in chordoma cases.

Keywords:

Chondrosarcoma Chordoma Differential diagnosis Immunohistochemistry Neuroendocrine

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Area of Science:

Oncology
Pathology
Molecular Diagnostics

Background:

Chordomas are rare malignant bone tumors.
Differential diagnosis includes chondrosarcomas and metastatic carcinomas.
Insulinoma-associated protein 1 (INSM1) is a marker of neuroendocrine tumors.

Purpose of the Study:

To investigate INSM1 expression in chordomas.
To evaluate INSM1 as a potential diagnostic marker for chordomas.

Main Methods:

Retrospective examination of 57 chordoma tumor samples.
Immunohistochemical analysis for INSM1 expression.

Main Results:

INSM1 expression was detected in only 5% of the examined chordomas.
The low expression rate suggests limited utility of INSM1 in chordoma diagnosis.

Conclusions:

INSM1 is rarely expressed in chordomas.
This finding raises questions regarding neuroendocrine differentiation in chordomas.
INSM1 is not a reliable marker for chordoma diagnosis.