The fundamental principle of Tissue Microarray (TMA) is high-throughput parallel analysis. Instead of processing each tissue sample individually on separate slides, TMA consolidates dozens, hundreds, or even thousands of small cylindrical tissue cores—each taken from a different donor paraffin block—into a single recipient paraffin block in an organized grid pattern. This recipient block is then sectioned to produce slides where each slide contains a miniature representation of all the included tissues. This principle allows researchers to apply a single experimental procedure—such as an immunohistochemical stain, a fluorescent in situ hybridization (FISH) assay, or an RNA probe—simultaneously to hundreds of different tissue samples under perfectly identical conditions. The core idea is maximizing data output while minimizing reagent use, labor, and inter-slide variability by treating many samples as one.

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