520 Preliminary biomarker and pharmacodynamic (PD) activity of the TGFβ inhibitor SAR439459, alone or in combination with cemiplimab, in a phase 1 clinical study in patients with a... oleh Rui Wang, Ivan Borbath, Patrícia Martin, Armando Santoro, Bernard Doger, Elena Garralda, Oliver Bechter, Giovanni Abbadessa, Debbie Robbrecht, Grob Jean-Jacques, Butler Marcus, Cheng Tina, Bennouna Jaafar, Massimo Di Nicola, Alejo Rodriguez -Vida, Dirk Schadendof, Brigitte Demers, Amele Amrate, Tun Tun Lin, Manisha Brahmachary, Joon Sange Lee, Joachim Theilhaber, Rob Pomponio