HL-A antigens (17, 27, UPS) in psoriasis with special reference to patients with arthritic lesions.

Fifty patients with longstanding and severe psoriasis vulgaris have been tissue-typed. HL-A 17 and 27 from second sublocus and UPS from third sublocus have been found to occur in increased frequency. HL-A 27 was found to be more prevalent among those with arthritic lesions. The lack of significantly increased frequency of HL-A 13 is discussed.