To explore PFS, ORR (CR/CRu+PR), OS and side effects of piamprizumab combined with RMA in newly diagnosed PCNSL, so as to clarify the value of piamprizumab combined with RMA in the first-line treatment of PCNSL patients, and to clarify the clinical and biological factors affecting the efficacy
For initial PCNSL confirmed by pathological tissue, the diagnostic criteria were based on WHO diagnostic criteria in 2016
Head MR (plain scan + enhancement) performed 28 days prior to study enrollment should show the presence of at least one measurable lesion in two vertical directions (according to 2014 Lugano criteria); Or abnormal cerebrospinal fluid examination (including cerebrospinal fluid protein, cells, NGS), or ophthalmologic examination confirmed the retina, vitreous lesions
PS score was 0~4 according to ECOG
Organs or lymph nodes outside the central nervous system are involved
Patients with a second primary tumor (other than non-melanoma skin cancer in situ, superficial bladder cancer, cervical cancer in situ, gastrointestinal intramucosal cancer or breast cancer that has been cured and has not recurred within 5 years)
Has a history of allergic disease, severe drug allergy, or is known to be allergic to any component of a macromolecular protein preparation or penpulimab injection prescription
Prior treatment with anti-PD-1 antibody, anti-PD-L1 antibody, anti-PD-L2 antibody, anti-CTLA-4 antibody, or CAR T cell therapy (or any other antibody that acts on T cell co-stimulation or checkpoint pathways)