Efficacy and safety of avelumab treatment in patients with metastatic Merkel cell carcinoma: experience from a global expanded access program ============================================================================================================================================= * John W Walker * Celeste Lebbé * Giovanni Grignani * Paul Nathan * Luc Dirix * Eyal Fenig * Paolo Antonio Ascierto * Shahneen Sandhu * Rodrigo Munhoz * Elena Benincasa * Sarah Flaskett * Josh Reed * Arne Engelsberg * Subramanian Hariharan * Vijay Kasturi