Selinexor, Cyclophosphamide and Prednisone in Myeloma

Selinexor is a Selective Inhibitor of Nuclear Export (SINE) compound that binds and inactivates Exportin 1 (XPO1), thereby forcing the nuclear retention of key tumour suppressor proteins (TSPs). Selinexor is an oral, first-in-class, potent, slowly reversible, covalent-binding Selective Inhibitor of Nuclear Export (SINE) compound that specifically blocks the karyopherin protein Exportin 1 (XPO1), also called chromosome region maintenance 1.

Cyclophosphamide is a long used conventional chemotherapy with potent anti-myeloma activity and low toxicity when administered at low doses as in the current protocol (Hajek et al. (2016)). It is being extensively used in combination with novel agents, including bortezomib, lenalidomide, and pomalidomide, and provides a cost-effective and well-tolerated alternative as a combination partner (Morgan et al. (2007); Mai et al. (2015); Baz et al. (2016)).

Steroids have been a very effective backbone for every myeloma combination therapy developed so far. Prednisone is the standard steroid in a number of widely used regimens (Mateos et al. (2010);Palumbo et al. (2006)). Decreasing the morbidity associated with high dose steroid use by using better-tolerated regimens addresses a large unmet need of the myeloma patient population.