Malignancies and soluble tumor antigens in rheumatic diseases
Introduction
There are various aspects of the association of rheumatic diseases with cancer: 1) Musculoskeletal symptoms and syndromes may develop as paraneoplastic diseases during the presence of malignancies; 2) there may be an increased incidence of tumors in certain systemic inflammatory and autoimmune diseases; 3) some immunosuppressive agents, including DMARDs, may increase the risk for cancer, and 4) circulating tumor markers may be elevated in the sera of patients with arthritis. (Primary or metastatic tumors developing within the musculoskeletal system will not be discussed).
Section snippets
Paraneoplastic syndromes
In the case of paraneoplastic rheumatic disorders, the tumor is at distance from the joints, and the articular and periarticular regions are not affected by the cancer. The symptoms may present as well defined autoimmune and anti-inflammatory disorders that usually occur without malignancy or they can be seen as vasculitis or other joint, bone, muscle or soft tissue diseases. Paraneoplastic musculoskeletal symptoms may precede the development of malignant disease with years but the two
Risks of developing malignancies in rheumatic diseases
There have been numerous reports of the association between rheumatic diseases and the development of tumors, particularly lymphoproliferative disorders (Table 2). Several factors including the autoimmune disease itself, viral factors (e.g. EBV) and others have been implicated in the pathogenesis of tumor development. However, it is difficult to separate disease-derived mechanisms from the potential oncogenic properties of immunosuppressive drugs used in these autoimmune-inflammatory diseases
Immunosuppressive and cytotoxic agents associated with tumor development
Numerous medications used to treat arthritis and autoimmune diseases modulate the immune system. Therefore, these agents may directly or indirectly be associated with the subsequent development of malignancies. Such drugs may confer the risk through direct DNA mutagenesis, generalized immunosuppression increasing the risk of EBV-associated lymphomas or through toxic injury as seen in the urinary bladder when using cyclophosphamide. Longer treatment has been associated with increasing risk of
Soluble tumor antigens in rheumatic diseases
There have been scattered reports, that some tumor-associated antigens (TAA) may, apart from cancer cells, become expressed on the surface of inflammatory cells. We and others have detected carcinoembryonic antigen (CEA)-related antigens (CD66b and CD66c) on neutrophils and monocyte/macrophages. In addition, there is an increased expression of CD66 in the RA synovial tissue in comparison to normal synovia [29], [30]. CEA is present mostly on colorectal and gastric carcinomas, CA15-3 on breast
Conclusions
There is an increasing recognition that neoplasia is associated with a wide range of rheumatic disorders and symptoms. Parts of these are of paraneoplastic origin, but the rheumatic disease itself or immunosuppressive and cytotoxic therapy may also increase the risk for the development of various types of malignancies. Paraneoplastic symptoms may precede the diagnosis of the tumor, and can be predictive of a malignant disease. In certain cases the paraneoplastic symptoms point to the tumor
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