By Melodie Warner 
 

Isis Pharmaceuticals Inc. (ISIS) earned a $10 million milestone payment from AstraZeneca PLC's (AZN, AZN.LN) decision to add a second development candidate to their collaboration on novel cancer antisense drugs.

Isis had struck a deal with AstraZeneca in December to develop novel generation antisense therapeutics against five cancer targets. The deal included an exclusive license for AstraZeneca to develop and commercialize ISIS-STAT3, a drug Isis was evaluating for patients with advanced lymphomas.

Isis on Monday said AstraZeneca has added a second development candidate, ISIS-AR(Rx), to the collaboration.

AstraZeneca plans to develop ISIS-AR(Rx) as a prostate cancer treatment, both as a single agent and in combination therapy.

With the selection of ISIS-AR(Rx), Isis said it has earned $35 million in upfront and milestone payments from AstraZeneca. Isis is also eligible to earn additional milestone payments as the drug progresses in development as well as royalties on sales if ISIS-AR(Rx) is successfully commercialized.

Shares of Isis closed Friday at $21.69 and were inactive premarket. The stock has more than doubled so far this year.

Write to Melodie Warner at melodie.warner@dowjones.com

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