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IMMUNOEDITING IN AUTOIMMUNE RHEUMATIC DISEASES.

¹Baltimore, Maryland.

Transactions of the American Clinical and Climatological Association

|October 5, 2022

Summary

Autoimmune rheumatic diseases like scleroderma are linked to cancer risk. Specific autoantibodies and broader immune responses in patients may regulate cancer development, offering insights into prediction and therapy.

Area of Science:

Immunology
Rheumatology
Oncology

Background:

Autoimmune rheumatic diseases feature specific autoantibodies linked to disease phenotypes.
A subset of scleroderma patients with POLR3 autoantibodies exhibit concurrent cancer onset.

Purpose of the Study:

To investigate the relationship between autoantibodies, genetic changes, and cancer development in scleroderma.
To explore the role of immune response breadth in regulating cancer emergence in rheumatic diseases.

Main Methods:

Analysis of autoantibodies in scleroderma and dermatomyositis patients.
Examination of genetic alterations (somatic mutations, loss of heterozygosity) in POLR3A gene in matched cancers.
Assessment of immune responses against autoantigens.

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Main Results:

Majority of scleroderma patients with POLR3 autoantibodies showed POLR3A gene mutations in their cancers.
Immune responses targeted both mutated and wild-type POLR3A.
Patients with broader immune responses against additional autoantigens did not develop cancer, suggesting immune regulation.

Conclusions:

The study highlights a link between specific autoantibodies (POLR3), genetic alterations in POLR3A, and cancer in scleroderma.
Immune response breadth and magnitude appear to regulate cancer development, offering a unique model for studying cancer immunoediting in humans.
Findings have implications for predicting and treating both autoimmune diseases and cancer.