Proteins. Heatmap (A) and volcano plot (B), visualizing abundance distributions and significant differences of proteins, respectively, in cerebrospinal fluid (CSF) of medulloblastoma (MB) and reference (Ref) samples. Difference values in the volcano plot are shown in a logarithmic scale to the basis of 2. Proteins were additionally classified according to the gene ontology term “leukocyte mediated immunity [2443]” and/or “defense response [6952]” (LMI-DR), and according to existing literature into anti-inflammatory proteins (AI), proteins related to brain function (BF), hypoxia-related proteins (HYP), pro-inflammatory proteins (PI), tumor markers (TM) and tumor promotors (TP). Principal component analysis (C) demonstrates the group separation of neoplastic medulloblastoma (MB) and non-neoplastic reference (Ref) samples based on investigated proteins.