By Tess Stynes 
 

Inovio Pharmaceuticals Inc. (INO) said pharmaceutical giant Roche Holding AG (RHHBY, ROG.VX, RO.EB) will pay as much as $422.5 million in an exclusive licensing agreement for Invio's investigational gene-based vaccines for prostate cancer and hepatitis B.

Inovio's shares were up 33% at $2.96 in recent premarket trading.

The companies will collaborate on the two compounds--known as INO-5150 for prostate cancer and INO-1800 for hepatitis B--which are in preclinical development.

Under the agreement, Roche will pay $10 million upfront and as much as $412.5 million in milestone payments. Additional development milestone payments could also be made if Roche pursues using the compounds to treat other illnesses.

Inovio is entitled to receive up to double-digit tiered royalties on any product sales. Roche also obtained an option to license additional vaccine opportunities in connection with a collaborative cancer research program.

Roche's American depositary shares closed Monday at $63.39 and were inactive premarket.

Write to Tess Stynes at tess.stynes@wsj.com

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