Purpose: Evaluate safety, hypertrophy, and kinetic growth rate (KGR) of future liver remnant following Y-90 radiation lobectomy in liver cancer using resin microspheres.
Methods: Retrospective, single center study. Patients with primary liver cancer undergoing RL-90Y TARE from 11/2015 to 12/2022 included. Single-compartment dosimetry model was used. Total liver parenchymal volume (TLPV), treated parenchymal volume (TPV), future liver remnant volume (FLRV) were recorded at baseline (T0), and post-treatment at 0-4 months (T1), and > 4 months (T2). Hypertrophy, FLRV/TLPV ratio, KGR were calculated. Treatment response was categorized by mRECIST for HCC and RECIST for iCCA. Primary outcomes included safety profile, hypertrophy, KGR. Secondary outcomes included disease response and proportion of patients bridged to surgery.
Results: 28 patients (68% HCC, 36% iCCA) were included. Right lobe treated in 18/28 (64%). The hypertrophy and KGR at T1 were 16% (IQR:4-28) and 1.5%/week (IQR:0.6-2.3) with increase in FLRV (P <.001) and FLRV/TLPV ratio (P <.001). KGR was higher at T1 vs T2 (1.3% vs. 0.6%, P =.034). Treatment response (n=27) was complete, partial, stable, progressive in 53%, 24%, 6%, 18% for HCC and 0%, 20%, 50%, 30% for iCCA. Seven (25%) patients were bridged to resection at 2.5 months (IQR:1.9-4.7). No differences noted in atrophy, hypertrophy, KGR at both timepoints (T1 and T2) when stratified on type of cancer, cirrhosis, portal vein thrombosis, or prescribed tumor dose.
Conclusion: RL-90Y TARE using single compartment dosimetry with resin microspheres can safely be performed in patients with primary liver cancer with KGR of 1.5%/week.
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