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Heterotopic ossification: a case report and immunohistochemical observations
J C Randall1, D C Morris, T Tomita
1Department of Pathology and Oncology, University of Kansas Medical Center, Kansas City 66103.
Human Pathology
|January 1, 1989
Summary
Metastatic colon cancer can cause heterotopic ossification, a rare bone formation in lymph nodes. Alkaline phosphatase is key in this process, linking cancer cells to bone development.
Area of Science:
- Oncology
- Pathology
- Biochemistry
Background:
- Metastatic adenocarcinoma of the transverse colon can present with unusual extraskeletal manifestations.
- Heterotopic ossification (HO) is the formation of bone in non-skeletal tissues, a rare complication of various conditions.
Observation:
- A case of a 69-year-old man with transverse colon adenocarcinoma who developed HO in a metastatic axillary lymph node.
- Pathologic bone formation exhibited osteoblast-like cells and mineral deposits.
- Immunostaining revealed alkaline phosphatase (ALP) concentration in these cells and adjacent adenocarcinoma glandular cells.
Findings:
- Metastatic colonic carcinoma was observed to promote heterotopic ossification.
- Alkaline phosphatase (ALP) was significantly concentrated in osteoblast-like cells and adjacent cancer cells at ossification sites.
- Proliferating mesenchymal cells near osteogenesis also showed significant ALP immunolabeling.
Implications:
- This case highlights a novel association between metastatic colon cancer and heterotopic ossification.
- Alkaline phosphatase plays a crucial role in the pathological bone formation associated with metastatic adenocarcinoma.
- Understanding this mechanism may offer new insights into cancer progression and potential therapeutic targets.