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Abstract: Detection of bone marrow involvement (BMI) in diffuse large B-cell lymphoma (DLBCL) typically relies on invasive bone marrow biopsy (BMB) that faces procedure limitations, while 18F-FDG PET/CT imaging offers a noninvasive alternative. The present study assesses the performance of 18F-FDG PET/CT in DLBCL BMI detection, its agreement with BMB, and the impact of BMI on survival outcomes. Patients and methods This retrospective study analyzes baseline 18F-FDG PET/CT and BMB findings in145 stage II–IV DLBCL patients, evaluating both performance of the two diagnostic procedures and the impact of BMI on survival. Results DLBCL BMI was detected in 38 patients (26.2%) using PET/CT and in 18 patients (12.4%) using BMB. Concordant results were seen in 79.3% of patients, with 20.7% showing discordant results. Combining PET/CT and BMB data, we identified 29.7% of patients with BMI. The sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy of PET/CT for detecting DLBCL BMI were 88.4%, 100%, 100%, 95.3%, and 96.5%, respectively, while BMB showed lower sensitivity (41.9%) and NPV (46.8%). The median overall survival (OS) was not reached in any gender subgroup, with 5-year OS rates of 82% (total), 84% (female), and 80% (male) (p = 0.461), while different International Prognostic Index (IPI) groups exhibited varied 5-year OS rates: 94% for low risk (LR), 91% for low-intermediate risk (LIR), 84% for high-intermediate risk (HIR), and 65% for high risk (HR) (p = 0.0027). Bone marrow involvement did not impact OS significantly (p = 0.979). Conclusions 18F-FDG PET/CT demonstrated superior diagnostic accuracy compared to BMB. While other studies reported poorer overall and BMI 5-year OS in DLBCL, our findings demonstrated favourable survival data.
Keywords: diffuse large B-cell lymphoma, bone marrow, biopsy
Published in DiRROS: 26.06.2026; Views: 306; Downloads: 121
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Abstract: Abstract: Quantitative 18F-FDG PET/CT-derived metabolic metrics are strongly associated with patient outcomes in diffuse large B-cell lymphoma (DLBCL), but the lack of consensus on optimal segmentation thresholds limits standardization. This study evaluated the prognostic value of various metabolic tumor volume (MTV) segmentation approaches in 140 stage II–IV DLBCL patients treated with standard immunochemotherapy. MTV was derived using fixed SUV (≥2.5, ≥4.0), relative (>41% SUVmax), and adaptive (liver-tobackground) thresholds. Baseline MTV metrics significantly correlated with 3-year overall survival (OS3) in univariate analysis in overall cohort, with MTV41 showing the strongest association (HR: 1.27; p = 0.003). MTV25 and MTV41 remained significant in the stage 4 patient subgroup. However, in multivariate analysis, no MTV metric independently predicted OS3 when adjusted for the International Prognostic Index (IPI), which remained the dominant predictor (HR: 1.95; p < 0.0001). ROC analysis confirmed superior AUC for IPI (0.76) over PET-based metrics (0.64–0.69). Predictive models integrating IPI with PET metrics were robust but failed to improve prognostic accuracy beyond IPI alone. Although PET-derived MTV metrics provide prognostic value in univariate analysis, threshold selection has minimal impact, and their added value is limited when combined with IPI, reinforcing its role as the most reliable survival predictor in DLBCL.
Keywords: diffuse large B-cell lymphoma, 18F-FDG, overall survival, PET/CT
Published in DiRROS: 21.11.2025; Views: 629; Downloads: 277
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Abstract: Zaradi fiziološko intenzivnega metabolizma glukoze v možganih je uporabnost 18F –FDG PET/CT v nevroonkologiji omejena. V zadnjih letih se je za potrebe nevroonkologije razširilo PET slikanje z aminokislinskimi radiofarmaki: analogi metionina, tirozina in DOPA. Natančnost teh vrst slikanja presega MRI s kontrastom za omejitev obsega bolezni v možganih, določanje najagresivnejših področij v tumorju, določanje pooperativnih ostankov tumorja za dodatno radioterapijo ter opredelitev zgodnjih in poznih sprememb po radioterapiji.
Keywords: možganski tumorji, centralno živčevje, radioterapija
Published in DiRROS: 15.12.2022; Views: 2397; Downloads: 492
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Keywords: glioblastom, obsevanje, možganski rak, možganski tumor
Published in DiRROS: 17.06.2022; Views: 2284; Downloads: 659
Full text (125,57 KB)