Adrian Duek MD, Emmanuel Lellouche PhD, Sharon Ben Baruch MD, Reut Mashiach BSc, Yafit Segman MD, Gabriel Bryk PhD, Merav Leiba MD
Background: Multiple myeloma (MM) accounts for approximately 10% of hematological malignancies. The monoclonal immunoglobulin G kappa (IgG-κ) daratumumab can bind to CD38 on MM cells and be detected in serum immunofixation (IF), causing pitfalls in M-protein quantification.
Objectives: To determine the efficacy of mitigating the interference of IgG MM treated with daratumumab.
Methods: Levels of Ig, free light chains (FLC) kappa (κ) and lambda (λ), serum protein electrophoresis (SPE)/IF, and Hydrashift 2/4 assays were assessed following manufacturer's instructions in three patients.
Results: Patient 1 was a 70-year-old male diagnosed with IgG-λ MM. The IF distinguished two monoclonal bands (IgG-κ and IgG-λ). With the Hydrashift assay, the daratumumab–anti-daratumumab immune complex shifted the IgG-κ to the α zone, suggesting that the monoclonal IgG-κ band corresponded to daratumumab. Patient 2 was a 63-year-old male with IgG-κ MM who was receiving daratumumab once every other week. SPE/IF assay revealed a faint monoclonal IgG-κ band in the g zone. A stronger monoclonal band was observed after administration. The IgG-κ band disappeared on the Hydrashift assay, while the daratumumab–anti-daratumumab complex appeared as a broad smear in the α-region. Patient 3, a 63-year-old male diagnosed with IgG-λMM, was receiving daratumumab once every other month. The IF assay showed two distinct bands (IgG-κ and IgG-λ) post-daratumumab administration. The shift to the α zone of the IgG-κ bands on the Hydrashift assay confirmed that the additional band observed post-infusion was due to the daratumumab.
Conclusions: The Hydrashift assay can help distinguish daratumumab from endogenous M-spike.
Ofira Zloto, M.D., Oded Sagiv, M.D., Ayelet Priel, M.D., Tali Cukierman-Yaffe, M.D., Amir Tirosh, M.D. , Nancy Agmon-Levin, M.D., Shiran Madgar, M.D., Tal Serlin, M.D., Halit Winter, M.D. Ruth Huna-Baron, M.D., Tamara Wygnanski-Jaffe, M.D., Guy Ben Simon, M.D.
Background: Little is known about the success of multidisciplinary thyroid eye disease (TED) clinic.
Objectives: To present the characteristics, treatments, and outcomes of patients treated in a multidisciplinary TED clinic.
Methods: A medical record review of all patients who attended a TED clinic was performed. Data included demographics, medical history, laboratory tests, visual function tests, ocular examinations, clinical activity score (CAS), and assessment of quality-of-life (QOL).
Results: Clinic visits included 132 patients seen during 385 appointments at a TED clinic (mean 12 appointments per patient). Management of TED included medical treatments for 48 patients (36.3%) and surgical treatment for 56 (42.4%). There was a positive significant correlation between the CAS and thyroid-stimulating immunoglobulin (TSI) activity at the first visit and at the last follow-up visit (P < 0.01 and P < 0.02, respectively). However, no correlation was found between the CAS and the thyroid-stimulating hormone levels or between the free triiodothyronine (fT3) and fT4 levels at the first or last visit. There was a significant negative correlation between the CAS and color vision (-0.347, P < 0.01, Pearson correlation) at the first visit, but not between the CAS and visual acuity and visual field at either the first or last visit. Changes in the QOL and the CAS scores were significantly negatively correlated (-0.240, P < 0.01).
Conclusions: Treatment and management decisions for TED should be based on multiple parameters including clinical examinations by ophthalmologists and endocrinologists, laboratory tests, and CAS and QOL scores.