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Mucin profiles in signet-ring cell carcinoma
Minh D Nguyen1, Brian Plasil, Ping Wen
1Department of Pathology, Ohio State University Medical Center, Columbus, USA.
Archives of Pathology & Laboratory Medicine
|June 3, 2006
Summary
Signet-ring cell carcinomas (SRCC) from different organs show distinct mucin expression patterns. This mucin profiling can help identify the primary origin of metastatic SRCC when the primary site is unknown.
Area of Science:
- Oncology
- Gastroenterology
- Pathology
Background:
- Signet-ring cell carcinoma (SRCC) is a poorly differentiated adenocarcinoma with identical morphology across organs.
- Differentiating the origin of metastatic SRCC based solely on morphology is challenging.
- Mucins, high-molecular-weight glycoproteins, are differentially expressed in epithelia and adenocarcinomas.
Purpose of the Study:
- To identify distinct mucin profiles in primary and metastatic SRCCs.
- To evaluate the utility of mucin staining via immunohistochemistry in distinguishing SRCC origins.
- To determine if mucin expression patterns are conserved in metastatic lesions.
Main Methods:
- Immunohistochemistry was performed on 47 SRCC tissue samples (38 primary, 9 metastatic).
- Monoclonal antibodies against MUC1, MUC2, MUC4, MUC5AC (MUC5), and MUC6 were used.
- Tumor sections were stained, and mucin expression was scored based on the proportion of positive tumor cells.
Main Results:
- Distinct mucin profiles were observed for gastric (MUC1.2.4.5.6v), colorectum (MUC2.4+/MUC5v/MUC1.6-), and breast (MUC1+/MUC2.5.6v/MUC4-) SRCCs.
- Metastatic SRCC cases exhibited mucin profiles consistent with their primary tumor origins.
- These findings highlight specific mucin expression patterns unique to SRCCs of different primary sites.
Conclusions:
- Primary SRCCs of the stomach, colorectum, and breast possess unique mucin expression patterns.
- These distinct mucin profiles are consistently maintained in metastatic SRCCs.
- Mucin profiling presents a valuable tool for identifying the primary site of unknown metastatic SRCCs.
