Real-Time Molecular Diagnosis of Tumors Using Water-Assisted Laser Desorption/Ionization Mass Spectrometry Technology

Philippe Saudemont, Jusal Quanico, Yves-Marie Robin, Anna Baud, Julia Balog, Benoit Fatou, Dominique Tierny, Quentin Pascal, Kevin Minier, Mélissa Pottier, Cristian Focsa, Michael Ziskind, Zoltan Takats, Michel Salzet, Isabelle Fournier,

Cancer Cell

https://doi.org/10.1016/j.ccell.2018.09.009

Abstract

Histopathological diagnosis of biopsy samples and margin assessment of surgical specimens are challenging aspects in sarcoma. Using dog patient tissues, we assessed the performance of a recently developed technology for fast ex vivo molecular lipid-based diagnosis of sarcomas. The instrument is based on mass spectrometry (MS) molecular analysis through a laser microprobe operating under ambient conditions using excitation of endogenous water molecules. Classification models based on cancer/normal/necrotic, tumor grade, and subtypes showed a minimum of 97.63% correct classification. Specific markers of normal, cancer, and necrotic regions were identified by tandem MS and validated by MS imaging. Real-time detection capabilities were demonstrated by ex vivo analysis with direct interrogation of classification models.