[Efficacy and prognostic analysis of orthopedic surgery in patients with newly diagnosed multiple myeloma].

Objective: To evaluate the efficacy and prognosis of orthopedic surgical resection surgery in patients with newly diagnosed multiple myeloma (NDMM). Methods: This retrospective cohort study collected clinical data of patients with NDMM who underwent surgery due to spinal cord compression or pathological long-bone fractures at the Peking Union Medical College Hospital from 1 January 2003 to 31 December 2021. Patients who received biopsy or vertebroplasty/kyphoplasty were excluded and patients with the same degree of bone disease and who did not undergo any surgical intervention were selected as controls. Visual analogue scale (VAS) and physical status (ECOG) scores, progression-free survival (PFS), and overall survival (OS) were compared. Statistical analysis included the χ²-test, t-test, and Kaplan-Meier methods. Results: Baseline data were compared between the surgical group (n=40 with 43 interventions) and the non-surgical group (n=80), and included sex, age, paraprotein type, International Staging System (ISS), number of lytic lesions, cytogenetic abnormalities, first-line treatment, and the proportion of patients receiving autologous stem cell transplantation (ASCT) (all P>0.05). Serum M protein levels in the surgical group were significantly lower than those of the non-surgical group [(21.95±16.44) g/L vs. (36.18±20.85) g/L, P=0.005]. The surgical lesions involved the axial skeleton (79.1%, 34/43) or the extremities (20.9%, 9/43). VAS and ECOG scores improved significantly after surgery (VAS: 2.30±0.80 vs. 6.60±1.50, P<0.001; ECOG: 2.09±0.59 vs. 3.09±0.73, P<0.001). The median follow-up time was 51 months. Kaplan-Meier survival analysis suggested that the median PFS (25 vs. 29 months) and OS (46 vs. 60 months) were comparable between the surgical and non-surgical intervention groups (both P>0.05). Subgroup analysis showed that among patients with ISS Ⅰ or those who had received ASCT, PFS in the surgical group was similar to that of the non-surgical intervention group (both P>0.05), while OS was worse (P=0.005, 0.017). Patients with ISS Ⅱ/Ⅲ scores or without ASCT had similar PFS and OS between the surgical and non-surgical intervention groups (all P>0.05). Cox multivariate analysis suggested that ISS and ASCT were independent prognostic factors for OS (ISS: HR=0.42, 95%CI 0.19-0.93, P=0.031; ASCT: HR=0.41, 95%CI 0.18-0.97, P=0.041), while orthopedic surgery did not influence survival (P=0.233). Conclusion: For patients with NDMM, orthopedic surgical resection decreased bone-related complications and improved quality of life, but did not affect survival.