Table 1

Characteristics of the three study cohorts

FHCRC

WTCCC*

STEP


Caucasian

1280

2730

411

Mestizo/Mestiza

212

Ethnicity

Others (African, Asian and other ethnic groups)

226

209


HLA-A, -B, and -C

1483

1929,1812,1558

832

HLA Loci

HLA-DRB1

1481

1969

832

HLA-DQB1

1434

1965

HLA-DPB1

832


Affy 5.0 array

1506

SNP genotyping platforms

Affy 500K

1480

Affy 6.0 array

2706

Illumina 550K

1438

Illumina 1.2M

2692

832


* In the WTCCC cohort, dubious samples were excluded according to WTCCC suggestions.

Number of samples in each study cohort that were of each ethnicity, genotyped for each HLA loci and genotyped on each SNP genotyping platform.

Zhang et al. BMC Genetics 2011 12:39   doi:10.1186/1471-2156-12-39

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