This image summarizes a lot of breast cancer genomic data. Genes (rows) and patient tissue samples (columns) are organized to highlight patterns. Each column represents data from a breast cancer patient. The first 11 rows characterize the patients' tumors.
For example, "Basal" tumors are aggressive and often have a "BRCA1" gene mutation. The remaining rows describe the expression levels of genes relative to the average expression of all genes. Red indicates elevated expression, and green indicates reduced expression.
We will create similar heatmaps in the course activities.