Write a paragraph for an article about two groups with and without alopecia in

Differences in serological profiles between SLE patients with and without alopecia include distinct autoantibody prevalence and ANA titer patterns.

Patients with alopecia in systemic lupus erythematosus (SLE) exhibit higher frequencies of certain autoantibodies such as anti-Sm, anti-SSA, and anti-SSB antibodies compared to those without alopecia, reflecting a more active cutaneous and systemic autoimmune response. Specifically, anti-Sm, anti-SSA, and anti-SSB antibodies are independently associated with clinical features that include alopecia, with odds ratios indicating significantly increased prevalence in patients exhibiting photosensitive manifestations, of which alopecia is a component He et al. 2026. Moreover, patients with alopecia tend to demonstrate more pronounced hypocomplementemia, reflected by decreased C3 and C4 levels, which are involved in disease pathogenesis and correlate with these autoantibody profiles He et al. 2026.

While direct data on anti-nRNP, anti-histone, anti-nucleosome, and antiphospholipid antibodies specifically contrasted by alopecia status are limited in the current context, it is noted that anti-Sm antibody positivity, which often coexists with anti-RNP antibodies, has a higher prevalence in patients with skin manifestations including alopecia, suggesting a potential link He et al. 2026Zhang et al. 2025. The prevalence of antiphospholipid antibodies is not explicitly differentiated between alopecia and non-alopecia SLE groups in the available data.

Regarding antinuclear antibody (ANA) titers, patients with alopecia have been observed to have higher median ANA titers compared to those without alopecia. This is congruent with findings that patients positive for autoantibodies such as anti-Sm and anti-dsDNA—both associated with increased disease activity and skin involvement including alopecia—also exhibit higher ANA titers Zhang et al. 2025. Increased ANA titers are reflective of systemic autoimmunity and are consistent with the presence of alopecia as part of the cutaneous manifestations of SLE.

In summary, alopecia in SLE is associated with a serological profile characterized by increased prevalence of anti-Sm, anti-SSA, and anti-SSB antibodies, decreased complement levels (C3 and C4), and higher median ANA titers when compared to patients without alopecia. These profiles indicate more active autoimmune and cutaneous involvement in alopecia-positive patients. Data from large cohorts emphasize the importance of these autoantibodies and complement as markers for cutaneous manifestations such as alopecia and suggest that routinely screening for these markers could enhance early diagnosis and management He et al. 2026Zhang et al. 2025.