DOG1 immunoreactivity in uterine leiomyosarcomas

Area of Science:

• Oncology
• Pathology
• Immunohistochemistry

Background:

• DOG1 is a sensitive and specific marker for gastrointestinal stromal tumors (GIST).
• Previous reports identified DOG1 immunoreactivity in uterine leiomyosarcoma.
• The prevalence of DOG1 in uterine leiomyosarcomas requires further investigation.

Purpose of the Study:

• To determine the prevalence of DOG1 immunoreactivity in uterine leiomyosarcomas.
• To compare DOG1 expression with CD117 (c-kit) in these tumors.
• To assess the diagnostic implications of DOG1 positivity in uterine leiomyosarcoma.

Main Methods:

• Immunohistochemical staining for DOG1 and CD117 was performed on 26 uterine leiomyosarcomas.
• Staining intensity was categorized as negative, focal (<50% positive cells), or diffuse (≥50% positive cells).
• Control cases including uterine leiomyomas were also analyzed.

Main Results:

• DOG1 immunoreactivity was detected in 7 out of 26 (27%) uterine leiomyosarcomas.
• CD117 immunoreactivity was observed in 3 out of 26 (11.5%) cases.
• DOG1 positivity was predominantly focal, with two cases showing diffuse staining.

Conclusions:

• DOG1 immunoreactivity is present in a significant subset of uterine leiomyosarcomas.
• The presence of DOG1 in uterine leiomyosarcomas can lead to diagnostic confusion with GIST.
• A panel of markers is essential for accurate diagnosis, and uterine leiomyosarcomas should be recognized as DOG1-positive mesenchymal neoplasms.