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Scleroderma and African Americans

What is the incidence and prevalence of scleroderma in African American patients? 

Incidence refers to the number of newly diagnosed cases of systemic sclerosis, while prevalence is the total number of cases.  In African American patients, the incidence of systemic sclerosis is higher than it is in non-African American patients. 

Among all African Americans, 23.7 people per million are diagnosed with systemic sclerosis, while the comparable rate among non-African Americans is 18.3 people per million diagnosed.  We see a similar pattern when looking at the prevalence of 315 of every one million African Americans diagnosed with systemic sclerosis.  In contrast, 225 of every one million non-African Americans are diagnosed with systemic sclerosis. 

What is the difference in disease progression between an African American patient and a non-African American patient?

The progression of the disease in African American patients can be different than in non-African American patients due to differences in autoantibodies.  Generally speaking, African American patients are diagnosed at a younger age than non-African Americans are diagnosed.  Additionally, African Americans far more frequently have the diffuse cutaneous form of systemic sclerosis, and they are more likely to have lung and other organ involvement than occurs among non-African Americans. 

How do symptoms among African American patients compare to symptoms of non-African American patients?

For African American patients with scleroderma, hyperpigmentation (patches of skin that become darker than the skin around it) is commonly seen early in the diagnosis on the hands, feet and face.

Raynaud Phenomenon is also not as obvious and may even be less severe than it could be in a non-African American patient.  More severe G.I. tract involvement and muscle disease is more commonly seen in African American patients.

YouTube 2014 African Americans Steen   Voice cover summer 2015 African Americans

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