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Leiden, The Netherlands, June 17, 2020, — ISA Pharmaceuticals B.V., a private clinical-stage immunotherapy company, today announced plans to initiate a potentially pivotal clinical trial for the combination of ISA101b and Libtayo® (cemiplimab) in oropharyngeal cancer, a type of head-and-neck cancer, under its strategic immuno-oncology collaboration with Regeneron. In addition, Regeneron will increase its equity stake in ISA Pharmaceuticals.

The new oropharyngeal cancer trial is
the third trial planned under the clinical collaboration between ISA Pharmaceuticals
and Regeneron. ISA101b, an immunotherapy targeting human papillomavirus type 16
(HPV16), is currently in a Phase 2 clinical trial for first- and second-line
HPV16-positive head-and-neck cancer in combination with