Single-Molecule Bioelectronic Portable Array for Early-Diagnosis of Pancreatic Cancer Precursors.

A cohort of 47 patients is screened for pancreatic cancer-precursors with a portable 96-well bioelectronic sensing-array for single-molecule assay in cysts fluid and blood plasma deployable at point-of-care (POC). Pancreatic cancer precursors are mucinous cysts diagnosed with a sensitivity of at most 80% by state-of-the-art cytopathological molecular analyses (e.g., KRAS mut DNA). Adding the simultaneous assay of proteins related to malignant transformation (e.g., MUC1 and CD55) is deemed essential to enhance diagnostic accuracy. The bioelectronic array here proposed, based on the SiMoT (Single-Molecule-with-a-large-Transistor) technology, can assay both nucleic acids and proteins at the single-molecule Limit-Of-Identification, LOI (<1% of false-positives and false-negatives). It comprises an ELISA-like 8×12-array organic-electronics disposable cartridge with an electrolyte-gated organic transistor sensor array, and a reusable reader, integrating a custom Si-IC chip, operating via software installed on a USB-connected smart device. The cartridge is complemented by a 3D-printed sensing gate cover plate. KRAS mut , MUC1, and CD55 biomarkers either in plasma or cysts-fluid from 5-6 patients at a time, are multiplexed at single-molecule LOI in 1.5 hours. The pancreatic cancer precursors are classified via a machine-learning analysis resulting in at least 96% diagnostic-sensitivity and 100% diagnostic-specificity. This preliminary study opens the way to POC liquid-biopsy-based early diagnosis of pancreatic-cancer precursors in plasma. This article is protected by copyright. All rights reserved.