Subacute Cutaneous Lupus Erythematosus (SCLE) Workup
- Author: Jeffrey P Callen, MD; Chief Editor: William D James, MD more...
Approach Considerations
Most patients with subacute cutaneous lupus erythematosus (SCLE) manifest a positive antinuclear antibody (ANA) reaction when tested with human substrates.
Anemia, leukopenia, and/or thrombocytopenia may be present, elevated sedimentation rate may occur in some patients, rheumatoid factor may be positive, and complement levels may be depressed. Urinalysis should be performed initially and also carried out periodically throughout the patient's course.
Serologic Testing
As mentioned, most patients with subacute cutaneous lupus erythematosus (SCLE) manifest a positive ANA reaction when tested with human substrates. HEp-2 cells are the substrate used most commonly in commercial laboratories. Anti-Ro (SS-A) autoantibodies are present in a high proportion of patients, as follows:
- Annular SCLE - 90%
- Papulosquamous SCLE - 80-85%
- SCLE with vasculitis, Sjögren syndrome, or C2d deficiency - Greater than 95%
- Mothers of neonates with LE - Greater than 90%
- Drug-induced SCLE - 70-80%
Anti-La (SS-B) autoantibodies often are present in a lesser percentage. Usually, laboratories perform the anti-Ro and anti-La autoantibody assays as a pair. Occasionally, patients have only anti-La (SS-B) autoantibodies. Anti-native DNA (double-stranded or nDNA) antibodies usually reflect SLE, but they may occur in some patients with SCLE.
Biopsy
Deposition of immunoglobulin and/or complement at the dermoepidermal junction is a characteristic feature of LE. Examination of tissue may be performed on skin lesions (lesional) or normal skin (nonlesional). Nonlesional biopsies may be performed on sun-exposed or nonexposed surfaces. Testing of nonlesional, nonexposed skin is termed the lupus band test (LBT).
The use and interpretation of these tests vary according to the site of biopsy. Only 60% of patients with subacute cutaneous lupus erythematosus (SCLE) test positive on lesional skin. Some, usually those with SLE, have a positive LBT.
Older lesions may be more likely to be negative on immunofluorescence microscopy. Lesions of TLE frequently are negative. The frequency of positive tests also is affected by tissue handling techniques. Snap frozen tissue is less likely to be falsely positive than tissue sent to the laboratory in Michel transport media.
Histologic Findings
Characteristic histopathologic alterations observed in subacute cutaneous lupus erythematosus (SCLE) include (1) vacuolar alteration of the basal cell layer and (2) an inflammatory cell infiltrate (usually lymphocytic) around vessels (perivascular), around appendiceal structures (periappendiceal), and in a subepidermal location. Epidermal changes, such as atrophy, are common, but follicular plugging is less frequent than in patients with DLE. An abundance of mucin often is seen within the dermis.
Histopathologic features differ depending on the type and age of the lesion. For example, papulosquamous lesions of SCLE are much more likely to manifest diagnostic findings than are annular lesions of SCLE. TLE lacks epidermal involvement.
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