Association of rs1544410 and rs7975232 Polymorphisms and Serum Vitamin D Levels with Psoriasis Susceptibility and Severity: A Case-Control Study in Egyptian Patients.

Background: Vitamin D is a regulatory factor for skin immune functions through vitamin D receptor, which is expressed on many immune cells. Vitamin D receptor is located on chromosome 12q 13.11 and has many single nucleotide polymorphisms.

Serum Vitamin D Levels in Chronic Hepatitis B Patients Before and During Treatment.

Background & Aims: Hepatitis B is a potentially life-threatening liver infection and it is a major global health problem. Over the past decade, numerous studies have reported that patients with CLD, especially HCV-positive and HBV-positive patients, have decreased 25(OH) D levels. The current study was designed to assess the serum levels of vitamin D [25(OH) D3] in chronic hepatitis B patients, before and during treatment with antiviral therapy.

Dose-response association between vitamin D deficiency and atopic dermatitis in children, and effect modification by gender: a case-control study.

Background: Vitamin D is a regulatory factor for immunity and skin barrier functions. It is hypothesized to be linked to atopic dermatitis (AD) which is characterized by interaction between epidermal barrier dysfunction and dysregulation of skin immune functions.

Methods: One hundred AD patients and one hundred and one normal controls were collected from outpatient clinic based on their clinical condition, both had measurement of 25-hydroxyvitamin D [25(OH)D].