Camrelizumab Plus Apatinib Demonstrates Encoruaging Activity in Patients With Refractory Chordoma According to results from an investigator-initiated phase 2 study, camrelizumab plus apatinib demonstrated encouraging efficacy and durable disease control in patients with refractory chordoma. According to results from an investigator-initiated phase 2 study, camrelizumab plus apatinib demonstrated encouraging efficacy and durable disease control in patients with refractory chordoma.