The three-year collaboration will try to identify biomarkers that can eventually be used for targeted diagnostics and therapies.
The firm previously held rights to develop and commercialize ERAS-0015 in territories outside of China, Hong Kong, and Macau.
The $550 million convertible senior notes offering was upsized from a previously announced offering of $350 million.
The new financing was led by Venrock Healthcare Capital Partners with participation from other new and existing investors.