STRING 9.05 
HLA-A [ENSP00000388526]
major histocompatibility complex, class I, A; Involved in the presentation of foreign antigens to the immune system (By similarity)
HLA-DR15 [ENSP00000353099]
HLA class II histocompatibility antigen, DRB1-15 beta chain Precursor (MHC class I antigen DRB1*15)(DW2.2/DR2.2)
Evidence suggesting a functional link:
Neighborhood in the Genome:  
none / insignificant.
Gene Fusions:  
none / insignificant.
Cooccurence Across Genomes:  
none / insignificant.
none / insignificant.
Experimental/Biochemical Data:  
none / insignificant.
Association in Curated Databases:   yes (score 0.900).  
Co-Mentioned in PubMed Abstracts:   yes (score 0.788).  
Combined Score:
Note: the two proteins have some sequence similarity (77.2 bits over 206 amino acids. click here to see the alignment).
Evidence for specific actions:
Reaction:yes (score: 0.900)