** Shares of PTC Therapeutics PTCT.O rise ~5.7% to $21.67
and Royalty Pharma RPRX.O shares up ~2.3% to $28.08 premarket
** Cos say Royalty Pharma will pay $1 bln in additional
royalties for PTC's spinal muscular atrophy (SMA) drug Evrysdi
** The deal also includes options for PTC to sell up to all
of its retained royalties on Evrysdi for up to $500 mln at a
later date
** The agreement builds on a previous partnership
established in 2020
** SMA prevents the body from producing a protein necessary
for neuromuscular development
** Up to last close, RPRX stock down ~30.5%, PTCT down
~46.3% YTD
(Reporting by Christy Santhosh)
((Christy.Santhosh@thomsonreuters.com))