ALOXI, INN-Palonosetron
SCIENTIFIC DISCUSSION 1. Introduction Aloxi contains palonosetron, a 5-hydroxytryptamine (serotonin) type 3 receptor antagonist, as active substance. With the present application, the applicant sought a marketing authorisation in the following indication: - “the prevention of acute nausea and vomiting associated with initial and repeat course of moderately and highly emetogenic cancer chemotherapy and - the prevention of delayed nausea and vomiting associated with initial and repeat courses of moderately emetogenic chemotherapy.” Chemotherapy-induced nausea and vomiting (CINV) CINV can be broadly categorised as acute, when nausea and vomiting occur within 24 hours after the start of chemotherapy [1], delayed, if CINV persist for 6 to 7 days after therapy [2, 3], or anticipatory, if CINV occur prior to chemotherapy administration [2, 4]. Chemotherapy agents have a highly variable emetogenic potential and can be classified according to their emetogenic level as agents with low, intermediate and high emetogenic risk. CINV remains a significant side effect experienced by cancer patients especially when treated with highly emetogenic regimens. It can impair patient’s quality of life and in case it becomes serious, dehydration, malnutrition, metabolic disturbances, and aspiration pneumonia may occur. As a consequence, control of nausea and vomiting plays an important part in the overall treatment success for cancer patients. The precise mechanisms by which chemotherapy induces nausea and vomiting are unknown. However, it appears probable that different chemotherapeutic agents act at different sites and that some chemotherapeutic agents act at multiple sites [5]. The mechanisms by which chemotherapeutic agents cause nausea and vomiting are activation of the chemoreceptor trigger zone (CTZ) either directly or indirectly, peripheral stimulation of the gastrointestinal tract, vestibular mechanisms, cortical mechanisms, or alterations of taste and smell [6].
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