The relationship between autoimmune reactions and cancer is complex. On one hand, certain autoimmune diseases can elevate the risk of developing cancer. For example, patients with systemic lupus erythematosus (SLE) have an increased risk of developing lymphoma. On the other hand, cancer can also induce autoimmune reactions by altering the immune system's regulation. Tumors may express antigens that resemble normal tissues, leading to an immune response against both the tumor and the healthy tissues.
