In the absence of systemic lupus erythematosus, the most common reason for a positive ANA test is the presence of another connective tissue disease. Diseases that often are associated with a positive ANA test include Sjögren's syndrome (68 percent of affected patients), scleroderma (40 to 75 percent), rheumatoid arthritis (25 to 50 percent), and juvenile rheumatoid arthritis (16 percent).20 An ANA test also can be positive in patients with fibromyalgia. In patients with diseases other than systemic lupus erythematosus, ANA titers usually are lower, and the immunofluorescent pattern is different.20

Collagen is the major insoluble fibrous protein in the extracellular matrix and in connective tissue. In fact, it is the single most abundant protein in the animal kingdom. There are at least 16 types of collagen, but 80 – 90 percent of the collagen in the body consists of types I, II, and III. These collagen molecules pack together to form long thin fibrils of similar structure. Type IV, in contrast, forms a two-dimensional reticulum; several other types associate with fibril-type collagens, linking them to each other or to other matrix components. At one time it was thought that all collagens were secreted by fibroblasts in connective tissue, but we now know that numerous epithelial cells make certain types of collagens. The various collagens and the structures they form all serve the same purpose, to help tissues withstand stretching.
Once remission is achieved, start maintenance therapy with azathioprine or mycophenolate mofetil (ie, use less potent agents relative to long-term cyclophosphamide). The ALMS maintenance trial also found that mycophenolate mofetil was superior to azathioprine in the maintenance of the renal response to treatment and in the prevention of relapse in patients with lupus nephritis. [134] In the MAINTAIN trial, there was a trend toward fewer renal flares in patients receiving mycophenolate mofetil than in those receiving azathioprine [135] ; however, these results did not reach statistical significance.
While the genetics of SLE are not very well understood, there is growing evidence for the involvement of specific genes in this complex autoimmune disease. Part of the complexity of this disease is due to the effects of both environment and genetics factors that may contribute to its development.[49] Further compounding our understanding of the etiology of the disease is the involvement of several organ systems.[50] Genetic studies of the rates of disease in families supports the genetic basis of this disease with a heritability of >66%.[51] Identical (monozygotic) twins were found to share susceptibility to the disease at >35% rate compared to fraternal (dizygotic) twins and other full siblings who only showed a 2–5% concordance in shared inheritance.[51]
Recent research has found an association between certain people with lupus (especially those with lupus nephritis) and an impairment in degrading neutrophil extracellular traps (NETs). These were due to DNAse1 inhibiting factors, or NET protecting factors in people's serum, rather than abnormalities in the DNAse1 itself.[65] DNAse1 mutations in lupus have so far only been found in some Japanese cohorts.[66]
Although no one symptom qualifies someone as having lupus, certain clinical techniques can be used to narrow down the diagnosis. For example, a test for antinuclear antibodies (ANAs) in the blood is probably the first tool a physician will use. A positive ANA test does not necessarily mean that someone has lupus; in fact, one out of five normal women has a positive ANA. However, a negative ANA test greatly reduces the suspicion.
Nonsteroidal anti-inflammatory drugs (NSAIDs). Over-the-counter NSAIDs, such as naproxen sodium (Aleve) and ibuprofen (Advil, Motrin IB, others), may be used to treat pain, swelling and fever associated with lupus. Stronger NSAIDs are available by prescription. Side effects of NSAIDs include stomach bleeding, kidney problems and an increased risk of heart problems.

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