Multitissue array review: A chronological description of tissue array techniques, applications and procedures

We performed a systematic search for literature dealing with tissue microarray technology. During the last two decades, these procedures have developed into a powerful tool for the high-throughput analysis of tissue specimens. This technology offers the following advantages: amplification of a scarce resource, experimental uniformity (tissue of multiple patients are treated in an identical manner), decreased assay volume, preservation of original blocks, amenability to a wide range of techniques and evaluation of tissue from multiple patients on the same slide. Depending on the shape of the tissue sample and the method used to obtain it, multitissue array techniques may be classified into two different groups: rod-shaped tissue techniques and core tissue techniques. These techniques have been used for quality control, diagnosis, and teaching and screening purposes. Some technical aspects should be considered when deciding which technique should be used: the number, size and origin of tissue samples; the quality of paraffin wax, the distance between samples and the depth in the receptor block; antigenicity preservation and block sectioning. This review shows different techniques, the use of which is dependent on the requirements of the arrays and the technical possibilities.