B-cell non-Hodgkin lymphomas (NHL) display dysregulation of pathways controlling cell proliferation and apoptosis. Combined proteasome and mTOR inhibition, demonstrated with bortezomib and everolimus in a preclinical model, thus warrants evaluation in humans. We conducted a phase I study to identify the maximum tolerated dose (MTD) and safety of this combination in relapsed/refractory (r/r) NHL. Twenty-nine patients were enrolled from July 2008 to March, 2015. Toxicities were primarily hematologic, and dose-limiting thrombocytopenia defined the MTD as 5 mg everolimus daily with 1.3 mg/m bortezomib d1, 4, 8, and 11 every 21 days. Of 25 response-evaluable patients there was one complete response in a patient with MCL and three partial responses (two MCL, one FL) for an overall response rate of 16%. In conclusion, the combination of everolimus and bortezomib results in dose limiting thrombocytopenia, but is tolerable. This combination has limited clinical activity in heavily pretreated NHL.

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http://dx.doi.org/10.1080/10428194.2017.1347932DOI Listing

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