alexa Sunitinib causes macrocytosis in patients with advanced renal cell carcinoma.


Journal of Blood Disorders & Transfusion

Author(s): Price J, Shaarbaf R, Wood L

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Abstract BACKGROUND: Sunitinib is approved for treatment of advanced renal cell carcinoma (RCC). Based on a clinical observation that patients receiving sunitinib developed macrocytosis, we undertook a study to further define this observation. METHODS: In a retrospective review of RCC patients treated at a single centre, data on treatment duration, hematology parameters, concomitant medications, vitamin B₁₂and folate levels, and thyroid function were recorded. RESULTS: The 43 patients reviewed had received a median of 5 cycles of sunitinib. Overall, 21 patients (49\%) developed macrocytosis after a median of 3 cycles. Of the 9 patients that received 2 or fewer cycles, none developed macrocytosis. Among patients with macrocytosis, 9 (43\%) had anemia at the time macrocytosis was first documented. In patients who did not develop macrocytosis, 82\% showed a trend of increasing mean corpuscular volume. CONCLUSIONS: Treatment with sunitinib in patients with RCC can cause macrocytosis. The frequency of macrocytosis increases with duration of treatment. The mechanism of sunitinib-associated macrocytosis remains to be elucidated.
This article was published in Curr Oncol and referenced in Journal of Blood Disorders & Transfusion

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