"Studied the association of interferon-lambda 4 (IFNL4)-related polymorphisms and human leukocyte antigen (HLA)-B haplotypes within long-term nonprogressor HIV-1 controllers (LTNP-Cs); HLA-B*57 was independently associated with the LTNP-C phenotype while IFNL4 genotypes represented independent factors for becoming non-LTNP-C."xsd:string