A Phase III Clinical Study Comparing JS004 Plus Toripalimab With Investigator-Selected Chemotherapy in Patients With PD-(L)1monoclonal Antibody Refractory Classic Hodgkin Lymphoma (cHL)

Participants will receive JS004 in combination with Toripalimab (200 mg/240 mg) by intravenous (IV) infusion on Day 1, then every three weeks (Q3W), for up to 35 infusions.

Participants will receive Investigator-Selected chemotherapy of EITHER bendamustine by IV infusion at a dose of 90 or 120 mg/m\^2 on Day 1 and Day 2 of either a 3- or 4-week cycle for up to 6 cycles OR gemcitabine by IV infusion at a dose of 1000 mg/m\^2 on Day 1 and Day 8 of a 3-week cycle for up to 6 cycles.