Conditionally active antibody specialist Cytomx Therapeutics Inc. has agreed to work with Regeneron Pharmaceuticals Inc. to discover and develop new bispecific antibodies with what the partners said is the potential to "widen the therapeutic window and help minimize off-target effects."
Attention has turned to Cytomx Therapeutics Inc.’s CX-2029 candidate after the company held up its program with the CD166-directed antibody-drug conjugate CX-2009, based on phase II data in patients with hormone receptor-positive/HER2-non-amplified breast cancer.
Though conceptually understood for decades, antibody-drug conjugates (ADCs) haven’t begun to come into their own until recently, but oncology drug developers continue to wrestle with challenges, large among them the problem of antigen selection. Lately, companies including names such as Adagene Inc., Bioatla Inc. and Cytomx Therapeutics Inc., have taken particular interest in exploiting features of the cancer growth itself to add more oomph, with focus on special features of the tumor microenvironment (TME).
Cytomx Therapeutics Inc. CEO Sean McCarthy told BioWorld that the longish hiatus between deals broken by the tie-up with Astellas Pharma Inc. was “very deliberate. Over that period of time, we were generating our first clinical data to get experience with how the technology works in cancer patients with our first two lead programs,” both of which have reached the phase II stage. A year ago in January, he said, the South San Francisco-based firm brought aboard Chief Business Officer Nick Galli to “hit the gas pedal a bit more in business development,” which led to the signing with Astellas, of Tokyo. Shares of Cytomx (NASDAQ:CTMX) closed March 24 at $6.53, up $1.60, or 32%.
Cytomx Therapeutics Inc. CEO Sean McCarthy told BioWorld that the longish hiatus between deals broken by the tie-up with Astellas Pharma Inc. was “very deliberate. Over that period of time, we were generating our first clinical data to get experience with how the technology works in cancer patients with our first two lead programs,” both of which have reached the phase II stage.
Cytomx Therapeutics Inc. CEO Sean McCarthy said earlier this month that the firm was “not ready to guide on specific response rates” that the company hopes for in the phase II study with anti-PD-L1 Probody CX-072 in combination with ipilimumab, or ipi (Yervoy, Bristol-Myers Squibb Co.) in patients with relapsed refractory melanoma.
