SUCCESSFUL TREATMENT OF RELAPSES OF PRIMARY MEDIASTINAL LARGE B-CELL LYMPHOMA WITH CENTRAL NERVOUS SYSTEM INVOLVEMENT

Introduction. Relapses of primary mediastinal large B-cell lymphoma (PMB.L) with involvement of the central nervous system (CNS) are usually incurable. Therapy tactics in patients with PMBCL with relapse in the CNS have not been defined. Aim: to present clinical observations of the treatment of relapses of PMBCL with CNS involvement using the "R-PML-CNS-2022" protocol. Main findings. Two clinical observations of patients with relapses of PMBCL with involvement of the CNS are presented. In both cases, the "R-PML-CNS-2022" protocol was used as a second- line treatment, and a complete remission of the disease was achieved. In the first case, within 6 months after auto-HCT, maintenance therapy with pembrolizumab was performed. Complete remission of the disease continues for 15 months. In the second observation, maintenance therapy with pembrolizumab was also started, however, due to the development of autoimmune complications after 2 cycles, treatment was discontinued. Complete remission of the disease continues for 13 months. Conclusion. The development of a new strategy for the treatment of relapses of PMLCL with CNS lesion according to the "R-PML-CNS-2022" protocol is a potentially curative approach in this group of patients.