10th Military Research Hospital and Polyclinic 1 article published in JoVE Medicine On-Site Sampling and Extraction of Brain Tumors for Metabolomics and Lipidomics Analysis Joanna Bogusiewicz*1, Paulina Zofia Goryńska*1, Magdalena Gaca1, Kamila Chmara1, Krzysztof Goryński1, Karol Jaroch1, Dariusz Paczkowski2, Jacek Furtak2, Marek Harat2,3, Barbara Bojko1 1Department of Pharmacodynamics and Molecular Pharmacology, Faculty of Pharmacy, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, 2Department of Neurosurgery, 10th Military Research Hospital and Polyclinic, 3Division of Preventive Medicine and Healthy Policy, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun The manuscript presents on-site sampling of human brain tumors with solid phase microextraction followed by their biochemical profiling towards the discovery of biomarkers.