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Oxygen Sensor-Guided Fine Needle Biopsy Studies of Human Cancer Xenografts in Mice

McDonald, R. C.; Fischer, A. H.; Rusckowski, M.

2024-06-01 pathology
10.1101/2024.05.27.596060 bioRxiv
Show abstract

An oxygen sensor-mounted fine-needle biopsy tool was used for in vivo measurement of oxygen levels in tumor xenografts. The system provides a means of measuring the oxygen content in harvested tumor tissue from specific locations. Oxygen in human tumor xenografts in a murine model was observed for over 1 min. Tissues were mapped in relation to oxygen tension (pO2) readings and sampled for conventional cytological examination. Careful modeling of the pO2 readings over 60 seconds yielded a diffusion coefficient for oxygen at the sensor tip, providing additional diagnostic information about the tissue before sampling. Oxygen level measurement may provide a useful adjunct to the use of biomarkers in tumor diagnosis.

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