• H Lavon, P Matzner, A Benbenishty, L Sorski, E Rossene, R Haldar, E Elbaz, J P Cata, V Gottumukkala, and S Ben-Eliyahu.
• School of Psychological Sciences, Sharet Building, Tel Aviv University, Tel Aviv, Israel.
• Br J Anaesth. 2018 Jan 1; 120 (1): 188-196.

BackgroundPerioperative strategies can significantly influence long-term cancer outcomes. Dexmedetomidine, an α2-adrenoceptor agonist, is increasingly used perioperatively for its sedative, analgesic, anxiolytic, and sympatholytic effects. Such actions might attenuate the perioperative promotion of metastases, but other findings suggest opposite effects on primary tumour progression. We tested the effects of dexmedetomidine in clinically relevant models of dexmedetomidine use on cancer metastatic progression.MethodsDexmedetomidine was given to induce sub-hypnotic to sedative effects for 6-12 h, and its effects on metastasis formation, using various cancer types, were studied in naïve animals and in the context of stress and surgery.ResultsDexmedetomidine increased tumour-cell retention and growth of metastases of a mammary adenocarcinoma (MADB 106) in F344 rats, Lewis lung carcinoma (3LL) in C57BL/6 mice, and colon adenocarcinoma (CT26) in BALB/c mice. The metastatic burden increased in both sexes and in all organs tested, including lung, liver, and kidney, as well as in brain employing a novel external carotid-artery inoculation approach. These effects were mediated through α2-adrenergic, but not α1-adrenergic, receptors. Low sub-hypnotic doses of dexmedetomidine were moderately beneficial in attenuating the deleterious effects of one stress paradigm, but not of the surgery or other stressors.ConclusionsThe findings call for mechanistic translational studies to understand these deleterious effects of dexmedetomidine, and warrant prospective clinical trials to assess the impact of perioperative dexmedetomidine use on outcomes in cancer patients.Copyright © 2017 British Journal of Anaesthesia. Published by Elsevier Ltd. All rights reserved.

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