Alex­ion bags a block­buster new ap­proval for its cash cow Soliris. Now what?

Alex­ion $ALXN has won ap­proval to sell its main­stay ther­a­py Soliris for an­oth­er batch of pa­tients suf­fer­ing from an ul­tra-rare con­di­tion — an OK that could well be worth north of a bil­lion dol­lars.

Last night the FDA came through with an OK for a sub­set of pa­tients suf­fer­ing from myas­the­nia gravis, set­ting the stage for a new sales ef­fort that Leerink’s Ge­of­frey Porges be­lieves will rack up $1.2 bil­lion in sales 5 years from now. That’s close to a fifth of the rev­enue he’s pro­ject­ing from Soliris — one of the world’s most ex­pen­sive ther­a­pies — for 2022.

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