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  • Accurate early prediction of tumour response to PDT using optical coherence angiography.

Accurate early prediction of tumour response to PDT using optical coherence angiography.

Scientific reports (2019-04-26)
M A Sirotkina, A A Moiseev, L A Matveev, V Y Zaitsev, V V Elagin, S S Kuznetsov, G V Gelikonov, S Y Ksenofontov, E V Zagaynova, F I Feldchtein, N D Gladkova, A Vitkin
PMID31019242
摘要

Prediction of tumour treatment response may play a crucial role in therapy selection and optimization of its delivery parameters. Here we use optical coherence angiography (OCA) as a minimally-invasive, label-free, real-time bioimaging method to visualize normal and pathological perfused vessels and monitor treatment response following vascular-targeted photodynamic therapy (PDT). Preclinical results are reported in a convenient experimental model (CT-26 colon tumour inoculated in murine ear), enabling controlled PDT and post-treatment OCA monitoring. To accurately predict long-term treatment outcome, a robust and simple microvascular metric is proposed. It is based on perfused vessels density (PVD) at t = 24 hours post PDT, calculated for both tumour and peri-tumour regions. Histological validation in the examined experimental cohort (n = 31 animals) enabled further insight into the excellent predictive power of the derived early-response OCA microvascular metric. The results underscore the key role of peri-tumour microvasculature in determining the long-term PDT response.