Human Tumor Atlas Tissue MicroArrary TNP (TMA-TNP) The Tissue MicroArray (TMA) TNP will extend the SARDANA-TNP characterization and analytics methodologies for evaluation and validation on a large array of breast tumor samples that provide a broad spectrum of disease state and subtype. A commercially available anonymized breast tumor TMA was purchased and sections distributed to participating HTAN Centers. Some deidentified basic clinical data will also be provided. The participating HTAN Centers will characterize the FFPE specimens (e.g. by imaging) and generate a spatially resolved cell type/state census using each Center’s method of choice. Data will then be recorded in a common repository to enable joint analysis. This TNP has two specific Aims focused on (i) Data Collection and (ii) Data Coordination and Analysis. Individual Centers can participate in one or both aims. The custom TMA design for this project was generated by Dr. Koei Chin (OHSU) and sent to Pantomics for custom TMA FFPE block generation and sectioning. The TMA design and clinical sample descriptions can be found here: dx.doi.org/10.17504/protocols.io.bn2fmgbn . This protocol describes the procedure by which the OHSU OMS Atlas HTAN Center sectioned and distributed TMA sections for Phase 4 analysis.