These findings indicate that fentanyl suppresses NKCC and increases the risk of tumor metastasis. Suppression of NK cells at a time when surgery may induce tumor dissemination can prove to be critical to the spread of metastases. It is suggested that the acute administration of a moderate dose of opiates during surgery should be applied cautiously, particularly in cancer patients.
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Shavit et al. (2004) studied this question.
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