Introduction: Ductal adenocarcinoma of pancreas is an extremely aggressive malignant tumor with a survival rate of 53% in 5 years. Considering the low survival rate, an early diagnosis with precise, reliable and possibly and non-invasive methods is recommended. Aim of the study: The main aim of this study was the comparison of the diagnostic performances of PET/RM, MR, and PET. Moreover, the prognostic value of semiquantitative parameters, extracted from the primary tumor, was also investigated. Materials and methods: Patients with ductal pancreatic adenocarcinoma referring to our tertiary center from 2017 to 2022 and undergoing a whole-ody PET/MR were included in this retrospective study. Clinical and surgical data as well as information regarding the imaging performed at diagnosis and during follow-up were collected. PET, MR and PET/MR images were used to assess the primary tumor, nodal and metastatic lesions. Moreover, from PET the following quantitative parameters were extracted: the mean Standardized Uptake Value (SUVmean), the maximum Standardized Uptake Value (SUVmax), the metabolic tumor volume (MVT) and the total lesion glicolisis (TLG). From the Diffusion Weighted Imaging (DWI) and corresponding Attenuation Coefficient Map (ADC) the ADCmin (10-6 mm2/s) was collected. The prognostic role of the quantitative parameters was investigated. The diagnostic value of PET/RM, PET, and MR was investigated in terms of sensibility, specificity, positive predictive value, negative predictive value in terms of primary tumor, nodal and metastastic lesions. Results: Fifty-six patients, with a suspect of pancreatic ductal adenocarcinoma, were evaluated with PET/RM but only 30 (aged 51-85, 22 males and 8 females) satisfied the inclusion criteria and were enrolled in the study. Thirteen patients were completely asymptomatic, 20 referred weight loss, 13 presented with jaundice and 13 underwent surgery. Progressive disease was established in 15 patients and 12 died. Both PET and RM as well as PET/RM showed 100% sensibility and specificity regarding the detection of the primary lesion. MR demonstrated higher sensibility (52 %) compared to PET (28 %) in the detection of nodal lesions with a total sensibility of PET/RM of 60 %. Similar results were obtained for metastatic liver lesions with PET and RM, both showing 88 % of sensibility and 100 % of specificity; PET/RM had 100 % sensitivity and specificity. Among the quantitative variables, only the SUVmean turned out to be a prognostic factor with a cut-off of 3.38. Conclusions: All techniques showed a good diagnostic performance in terms of primary tumor. PET/MR was more accurate in detecting nodal and hepatic spread. The variable SUVmean seems to be a prognostic factor for patients with ductal pancreatic adenocarcinoma.
Introduzione: L'adenocarcinoma duttale del pancreas è una neoplasia maligna, estremamente aggressiva e dalla prognosi infausta con una sopravvivenza del 53% a 5 anni. Di qui la necessità di una diagnosi precoce nonché di una stadiazione precisa, attendibile e non invasiva sfruttando le attuali metodiche di imaging. Scopo: lo scopo primario di questo studio è stato quello di comparare le performance diagnostiche della PET/RM con quelle dei suoi elementi PET e RM. È stato valutato inoltre il valore prognostico dei parametri semiquantititativi estratti dalla lesione primitiva. Materiali e metodi: Sono state raccolte in modo retrospettivo, nell’intervallo dal 2017 al 2022, informazioni cliniche, chirurgiche, di imaging alla diagnosi e al follow up di pazienti affetti da adenocarcinoma duttale del pancreas. Le immagini PET sono state valutate visivamente per ogni parametro della stadiazione “Tumor, Nodes, Metastases (TNM)” e semiquantitativamente per il tumore primitivo, estraendo: il mean Standardized Uptake Value (SUVmean), il maximum Standardized Uptake Value (SUVmax), il Metabolic Tumor Volume (MVT) ed il Total Lesion Glicolisis (TLG). Dalle immagini di risonanza è stata ricavata la classificazione TNM e attraverso le sequenze Diffusion Weighted Imaging (DWI) e la mappa del coefficiente di diffusione apparente (ADC) dell’acqua è stato estratto il parametro quantitativo mean Apparent Diffusion Coefficient value (ADCmean) . Si è quindi valutato il potere diagnostico della PET/RM e dei suoi elementi PET ed RM in termini di sensitività (SE), specificità (SP), valore predittivo positivo (VPP) e negativo (VPN) per quanto riguarda il tumore primitivo, le lesioni linfonodali e le metastasi a distanza. Inoltre è stato studiato il valore prognostico di: SUVmean, SUVmax, MVT, TLG e ADC min (10-6 mm2/s). Risultati: Da una popolazione di 56 pazienti sottoposti a PET/RM per sospetto di adenocarcinoma duttale del pancreas, 30 (età compresa tra 51 e 85 anni, 22 maschi, 8 femmine) hanno soddisfatto i criteri di inclusione e sono stati esaminati. Della popolazione selezionata 13 pazienti risultavano asintomatici, 20 hanno riferito perdita di peso, 13 erano itterici e 13 sono stati sottoposti a chirurgia. La progressione di malattia c'è stata in 15 pazienti e i decessi sono stati 12. Sia la PET che la RM e quindi la PET/RM hanno dimostrato 100% sensitività e specificità per la lesione primitiva. La RM ha dimostrato maggiore sensibilità (60%) della PET (28%) nell’identificazione di lesioni linfonodali con sensibilità complessiva della PET/RM del 60%. Sono risultati analoghi risultati per le metastasi epatiche in termini di performance della PET e della RM (88% sensibilità e 100% specificità) con valori del 100% per la PET/RM. È inoltre emerso che solamente il SUVmean correla con la prognosi e la sopravvivenza libera da malattia, in particolare la prognosi e la sopravvivenza sono migliori per valori di SUVmean inferiori a 3.38 mentre sono nettamente ridotte per valori superiori a tale cut-off. Conclusioni: Tutte e tre le tecniche hanno sempre identificato la lesione primitiva. Nella vautazione dei parametri N e M del TNM è emerso che la metodica ibrida PET/RM rispetto alle due tecniche prese singolarmente ha un eccellente potere diagnostico
Il valore addizionale della PET/MR con 18F-Fluorodesossiglucosio nell'iter diagnostico dei pazienti con diagnosi di adenocarcinoma del pancreas.
SITARA, MATTEO
2022/2023
Abstract
Introduction: Ductal adenocarcinoma of pancreas is an extremely aggressive malignant tumor with a survival rate of 53% in 5 years. Considering the low survival rate, an early diagnosis with precise, reliable and possibly and non-invasive methods is recommended. Aim of the study: The main aim of this study was the comparison of the diagnostic performances of PET/RM, MR, and PET. Moreover, the prognostic value of semiquantitative parameters, extracted from the primary tumor, was also investigated. Materials and methods: Patients with ductal pancreatic adenocarcinoma referring to our tertiary center from 2017 to 2022 and undergoing a whole-ody PET/MR were included in this retrospective study. Clinical and surgical data as well as information regarding the imaging performed at diagnosis and during follow-up were collected. PET, MR and PET/MR images were used to assess the primary tumor, nodal and metastatic lesions. Moreover, from PET the following quantitative parameters were extracted: the mean Standardized Uptake Value (SUVmean), the maximum Standardized Uptake Value (SUVmax), the metabolic tumor volume (MVT) and the total lesion glicolisis (TLG). From the Diffusion Weighted Imaging (DWI) and corresponding Attenuation Coefficient Map (ADC) the ADCmin (10-6 mm2/s) was collected. The prognostic role of the quantitative parameters was investigated. The diagnostic value of PET/RM, PET, and MR was investigated in terms of sensibility, specificity, positive predictive value, negative predictive value in terms of primary tumor, nodal and metastastic lesions. Results: Fifty-six patients, with a suspect of pancreatic ductal adenocarcinoma, were evaluated with PET/RM but only 30 (aged 51-85, 22 males and 8 females) satisfied the inclusion criteria and were enrolled in the study. Thirteen patients were completely asymptomatic, 20 referred weight loss, 13 presented with jaundice and 13 underwent surgery. Progressive disease was established in 15 patients and 12 died. Both PET and RM as well as PET/RM showed 100% sensibility and specificity regarding the detection of the primary lesion. MR demonstrated higher sensibility (52 %) compared to PET (28 %) in the detection of nodal lesions with a total sensibility of PET/RM of 60 %. Similar results were obtained for metastatic liver lesions with PET and RM, both showing 88 % of sensibility and 100 % of specificity; PET/RM had 100 % sensitivity and specificity. Among the quantitative variables, only the SUVmean turned out to be a prognostic factor with a cut-off of 3.38. Conclusions: All techniques showed a good diagnostic performance in terms of primary tumor. PET/MR was more accurate in detecting nodal and hepatic spread. The variable SUVmean seems to be a prognostic factor for patients with ductal pancreatic adenocarcinoma.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/48119