In an attempt to replicate the association of rs1344706[T] with schizophrenia, we used two data sets: (1) an initial set of Illumina genome-wide typed samples from Europe nonoverlapping with the samples of the original report4 (2299 cases, 16 216 controls) and (2) a set of follow-up samples from Europe and China also without an overlap with those of the initial study4 (2865 cases, 4493 controls). Because rs1344706 was not included on the Illumina HumanHap300 or HumanHap550 BeadChips, a surrogate, composed of a linear combination of haplotypes, was used in the analysis of the genome-wide data.
