In a technique for quantifying the spatial distribution of cells or sub-cellular structures, image data representing a spatial map of biomarkers is processed to obtain a set of coordinates. Each of the coordinates in the set denotes the location of a cell or sub-cellular structure represented by a biomarker or combination of biomarkers. The set of coordinates is processed into a two-dimensional symmetric (2N−1)×(2N−1) or 2N×2N matrix. The resulting matrix may be used for various purposes, such as assigning subjects clinical characteristics, and/or forming and/or testing scientific hypotheses for interventions, for example. Also described herein is an apparatus for performing the described technique.