Inflammatory infiltrates in parathyroid tumors

Area of Science:

• Endocrinology
• Oncology
• Immunology

Background:

• Inflammatory infiltrates are observed in solid tumors and can influence clinical behavior.
• Infectious viruses are known contributors to tumorigenesis in a significant proportion of human cancers.

Purpose of the Study:

• To characterize inflammatory infiltrates in primary hyperparathyroidism.
• To investigate potential viral transcription within parathyroid tumors.

Main Methods:

• Analysis of 55 parathyroid tumors with inflammatory infiltrates (2007-2016) using immunohistochemistry for immune cell markers.
• Comparison with 142 non-inflammatory parathyroid adenomas.
• Transcriptome sequencing of 13 parathyroid tumors to detect viral transcripts.

Main Results:

• Predominant lymphocytic infiltrates (T and B cells, CD8+ T lymphocytes) were found in inflammatory parathyroid tumors.
• Inflammatory infiltrates correlated with higher serum parathyroid hormone (PTH) levels and oxyphilic differentiation.
• Autoimmune disease was present in 27% of patients with inflammatory infiltrates, linked to oxyphilic changes.

Conclusions:

• Transcriptome sequencing revealed no evidence of virus-like sequences in parathyroid tumors.
• The study suggests that factors other than viruses may be responsible for attracting the immune system to parathyroid tumor tissues.