Genetic Links Between B-Cell Neoplasms and Autoimmune Disorders

Overview

This study analyzed familial risks between 44 autoimmune diseases (AIDs) and mature B-cell neoplasms—non-Hodgkin lymphoma (NHL), Hodgkin lymphoma (HL), and multiple myeloma (MM)—using nationwide Swedish registers. Significant associations were found between certain AIDs and NHL or HL, suggesting shared genetic susceptibility, while MM showed no strong familial links with AIDs.

Background

Mature B-cell neoplasms such as HL, MM, and NHL have established risk associations with personal histories of autoimmune diseases, which involve immune tolerance loss and tissue destruction. Autoimmune diseases are heterogeneous and affect up to 10% of the population. Prior studies have suggested pleiotropy, where single genes influence both cancer and autoimmune phenotypes, but familial risk data remain limited. This study leverages comprehensive Swedish population and medical registries to clarify familial associations between AIDs and B-cell neoplasms.

Data Highlights

Key Findings

• Overall familial risk for NHL was slightly increased when family members had any AID (SIR 1.04), decreased for HL (SIR 0.93), and unchanged for MM (SIR 1.01).
• Significant increased familial risks for NHL were observed with family history of angiitis hypersensitive (SIR 3.58), Guillain-Barre syndrome (1.70), discoid lupus erythematosus (1.63), Sjogren syndrome (1.31), and psoriasis (1.08).
• HL risk was significantly increased in families with pemphigus (SIR 3.88) and decreased with glomerular nephritis acute (0.38), ankylosing spondylitis (0.53), and Graves disease (0.75).
• No significant familial associations were found between MM and any AID.
• When family members had NHL, increased risks for AIDs such as angiitis hypersensitive (2.68), Sjogren syndrome (1.35), rheumatoid arthritis (1.08), and Wegener granulomatosis (1.55) were noted; decreased risks were seen for psoriasis, Graves disease, Hashimoto thyroiditis, and ulcerative colitis.
• Behcet disease showed increased risk in families with HL (SIR 3.28).

Clinical Implications

These findings highlight the importance of considering family history of specific autoimmune diseases when assessing risk for certain B-cell neoplasms, particularly NHL and HL. The observed pleiotropic genetic effects suggest shared pathogenic mechanisms that could inform risk stratification and potentially guide surveillance strategies. However, MM appears less influenced by familial autoimmune predisposition, indicating distinct etiologies.

Conclusion

The study provides robust evidence of familial genetic links between certain autoimmune diseases and mature B-cell neoplasms, especially NHL and HL, supporting the concept of pleiotropy in their pathogenesis. These insights enhance understanding of cancer-autoimmune disease interplay and may inform future genetic and clinical research.

References

1. Original Study -- Genetic Links Between Lymphoma, Myeloma, and Autoimmune Disorders