Background: Positron emission tomography (PET) with 18-fluorodeoxyglucose (18FDG) has proven to be highly sensitive in the early assessment of tumor response in gastrointestinal stromal tumors (GIST), especially in cases where there is doubt or when the early prediction of the response could be clinically useful for patient management. As widely known, kinase mutations have an undoubtful predictive value for sensitivity to imatinib, and the inclusion of KIT and PDGFRa mutational analysis in the diagnostic workup of all GIST is now considered standard practice. Case presentation: Herein, we described in detail a case of an exon 11 KIT mutated-metastatic GIST patient, who presented an unexpected metabolic progression at the early 18FDG-PET evaluation after 1 month of first-line imatinib, unconfirmed at the liver biopsy performed near after, which has conversely shown a complete pathological response. Conclusions: This report aims to highlight the existence of this metabolic pseudoprogression in GIST at the beginning of imatinib therapy in order to avoid early treatment discontinuation. Therefore, an early metabolic progression during a molecular targeted therapy always deserves to be evaluated in the context of the disease molecular profiling, and in case of a discordant finding between functional imaging and molecular background, a short-term longitudinal control should be suggested.

Metabolic pseudoprogression in a patient with metastatic KIT exon 11 GIST after 1 month of first-line imatinib: a case report / Elisa Tassinari, Nicole Conci, Giacomo Battisti, Francesco Porta, Valerio Di Scioscio, Maria Giulia Pirini, Dario de Biase, Maria Concetta Nigro, Miriam Iezza, Fausto Castagnetti, Luigi Lovato, Stefano Fanti, Maria Abbondanza Pantaleo, Margherita Nannini. - In: FRONTIERS IN ONCOLOGY. - ISSN 2234-943X. - ELETTRONICO. - 13:(2023), pp. 1-6. [10.3389/fonc.2023.1310452]

Metabolic pseudoprogression in a patient with metastatic KIT exon 11 GIST after 1 month of first-line imatinib: a case report

Elisa Tassinari;Nicole Conci;Giacomo Battisti;Francesco Porta;Dario de Biase;Maria Concetta Nigro;Miriam Iezza;Fausto Castagnetti;Stefano Fanti;Maria Abbondanza Pantaleo;Margherita Nannini
2023

Abstract

Background: Positron emission tomography (PET) with 18-fluorodeoxyglucose (18FDG) has proven to be highly sensitive in the early assessment of tumor response in gastrointestinal stromal tumors (GIST), especially in cases where there is doubt or when the early prediction of the response could be clinically useful for patient management. As widely known, kinase mutations have an undoubtful predictive value for sensitivity to imatinib, and the inclusion of KIT and PDGFRa mutational analysis in the diagnostic workup of all GIST is now considered standard practice. Case presentation: Herein, we described in detail a case of an exon 11 KIT mutated-metastatic GIST patient, who presented an unexpected metabolic progression at the early 18FDG-PET evaluation after 1 month of first-line imatinib, unconfirmed at the liver biopsy performed near after, which has conversely shown a complete pathological response. Conclusions: This report aims to highlight the existence of this metabolic pseudoprogression in GIST at the beginning of imatinib therapy in order to avoid early treatment discontinuation. Therefore, an early metabolic progression during a molecular targeted therapy always deserves to be evaluated in the context of the disease molecular profiling, and in case of a discordant finding between functional imaging and molecular background, a short-term longitudinal control should be suggested.
2023
Metabolic pseudoprogression in a patient with metastatic KIT exon 11 GIST after 1 month of first-line imatinib: a case report / Elisa Tassinari, Nicole Conci, Giacomo Battisti, Francesco Porta, Valerio Di Scioscio, Maria Giulia Pirini, Dario de Biase, Maria Concetta Nigro, Miriam Iezza, Fausto Castagnetti, Luigi Lovato, Stefano Fanti, Maria Abbondanza Pantaleo, Margherita Nannini. - In: FRONTIERS IN ONCOLOGY. - ISSN 2234-943X. - ELETTRONICO. - 13:(2023), pp. 1-6. [10.3389/fonc.2023.1310452]
Elisa Tassinari, Nicole Conci, Giacomo Battisti, Francesco Porta, Valerio Di Scioscio, Maria Giulia Pirini, Dario de Biase, Maria Concetta Nigro, Miriam Iezza, Fausto Castagnetti, Luigi Lovato, Stefano Fanti, Maria Abbondanza Pantaleo, Margherita Nannini
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/950963
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