16S rRNA gene surveys reveal hierarchical partitioning of human tumor tissue-associated microbiomes. Bacterial communities were clustered using Principal Coordinate Analysis (PCoA) of the full-tree-based Unifrac matrix. Each point corresponds to a sample colored to indicate tumor or healthy status. Three principle components (PC1, PC2, and PC3) totally explained 43% of the variation. Sample name started with their corresponding studied patient number - S00X (X= 1, 2, 4, 5, 6, 7, 8, and 9), and the following tissue type (C stands for cancer tissue and H for matched adjacent health tissue).