Additional Relevant Details Under the terms of the agreement, Karyopharm will receive $75 million at closing this month and is eligible to receive an additional $75 million upon the achievement of future regulatory and commercial milestones and subject to approval by both parties. In exchange for the amount received at the initial closing, HCR will receive a tiered royalty in the mid-single digits based on worldwide net revenues of XPOVIO and any other future products.   Karyopharm expects that the $75 million initially received from HCR under this royalty agreement, combined with its existing cash, cash equivalents and investments, together with the cash expected to be generated from product sales, will be sufficient to fund its operations into the middle of 2021.