Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines

Antibody-based targeted delivery of pharmaceuticals is an attractive approach to preferentially localize anti-cancer payloads to neoplastic lesions. The L19 antibody, specific for the extra domain B of fibronectin, is used in several antibody-cytokine fusion proteins investigated in clinical trials...

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Autores: Virgilio, Tommaso, Chahine, Kamil, Guixeras-Carreras, Jordi, Pulfer, Alain, Pizzichetti, Chiara, Latino, Irene, Molina Romero, Daniel, Capucetti, Arianna, Luca Renner, Louis, Neri, Dario, Puca, Emanuele, De Luca, Roberto, F. Gonzalez, Santiago
Tipo de recurso: artículo
Fecha de publicación:2026
País:España
Institución:Universitat Ramon Llull (URL)
Repositorio:DAU Arxiu Digital de la Universitat Ramon Llull
OAI Identifier:oai:dau.url.edu:20.500.14342/6014
Acceso en línea:http://hdl.handle.net/20.500.14342/6014
https://doi.org/10.1016/j.tranon.2026.102698
Access Level:acceso abierto
Palabra clave:Administration route
Lymphoma
Colon adenocarcinoma
Immunocytokine
Fibronectin
Biodistribution
Intravital microscopy
Confocal microscopy
Limfomes
Adenocarcinoma colorectal
Immunocitoquímica
Fibronectines
Microscòpia confocal
577
616
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spelling Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokinesVirgilio, TommasoChahine, KamilGuixeras-Carreras, JordiPulfer, AlainPizzichetti, ChiaraLatino, IreneMolina Romero, DanielCapucetti, AriannaLuca Renner, LouisNeri, DarioPuca, EmanueleDe Luca, RobertoF. Gonzalez, SantiagoAdministration routeLymphomaColon adenocarcinomaImmunocytokineFibronectinBiodistributionIntravital microscopyConfocal microscopyLimfomesAdenocarcinoma colorectalImmunocitoquímicaFibronectinesMicroscòpia confocal577616Antibody-based targeted delivery of pharmaceuticals is an attractive approach to preferentially localize anti-cancer payloads to neoplastic lesions. The L19 antibody, specific for the extra domain B of fibronectin, is used in several antibody-cytokine fusion proteins investigated in clinical trials involving different tumor types. However, improving the efficacy of L19-based immunotherapies requires a detailed understanding of how delivery strategies influence intratumoral distribution and therapeutic outcomes. In this study, we investigate the biodistribution of the L19 antibody in murine models of primary Eμ-myc lymphoma and metastatic MC38 colon carcinoma. Using high-resolution in vivo and ex vivo microscopy, we compared subcutaneous (s.c.) and intravenous (i.v.) administration of L19, revealing rapid accumulation in tumor invaded lymph nodes within 10–30 min post injection. While both routes enabled initial tumor targeting, i.v. injection led to longer retention (up to 72 h) and greater selectivity for tumor associated blood vasculature. In contrast, s.c. delivery favored transient accumulation near lymphatic vessels and exhibited reduced tumor residence. These distribution patterns directly influenced the therapeutic efficacy of the L19-IL2 immunocytokine, which showed superior tumor control following i.v. administration in the MC38 model, consistent with enhanced blood vascularization in this model. Our findings demonstrate that L19 binds both blood and lymphatic vasculature in primary and metastatic disease, underscoring the critical impact of the administration route on antibody biodistribution, microanatomical localization, and therapeutic outcome. Moreover, this work highlights the utility of microscopy guided analysis in optimizing delivery strategies and supports the rationale for tailoring administration routes based on tumor type and vascular context in antibody-based theranostics.info:eu-repo/semantics/publishedVersionElsevierUniversitat Ramon Llull. IQS202620262026info:eu-repo/semantics/articlep.10application/pdfhttp://hdl.handle.net/20.500.14342/6014https://doi.org/10.1016/j.tranon.2026.102698reponame:DAU Arxiu Digital de la Universitat Ramon Llullinstname:Universitat Ramon Llull (URL)InglésTranslational Oncology 2026, 66, 102698© L'autor/aAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:dau.url.edu:20.500.14342/60142026-06-21T06:40:37Z
dc.title.none.fl_str_mv Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines
title Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines
spellingShingle Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines
Virgilio, Tommaso
Administration route
Lymphoma
Colon adenocarcinoma
Immunocytokine
Fibronectin
Biodistribution
Intravital microscopy
Confocal microscopy
Limfomes
Adenocarcinoma colorectal
Immunocitoquímica
Fibronectines
Microscòpia confocal
577
616
title_short Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines
title_full Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines
title_fullStr Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines
title_full_unstemmed Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines
title_sort Imaging–guided optimization of biodistribution and antitumor efficacy of L19-based immunocytokines
dc.creator.none.fl_str_mv Virgilio, Tommaso
Chahine, Kamil
Guixeras-Carreras, Jordi
Pulfer, Alain
Pizzichetti, Chiara
Latino, Irene
Molina Romero, Daniel
Capucetti, Arianna
Luca Renner, Louis
Neri, Dario
Puca, Emanuele
De Luca, Roberto
F. Gonzalez, Santiago
author Virgilio, Tommaso
author_facet Virgilio, Tommaso
Chahine, Kamil
Guixeras-Carreras, Jordi
Pulfer, Alain
Pizzichetti, Chiara
Latino, Irene
Molina Romero, Daniel
Capucetti, Arianna
Luca Renner, Louis
Neri, Dario
Puca, Emanuele
De Luca, Roberto
F. Gonzalez, Santiago
author_role author
author2 Chahine, Kamil
Guixeras-Carreras, Jordi
Pulfer, Alain
Pizzichetti, Chiara
Latino, Irene
Molina Romero, Daniel
Capucetti, Arianna
Luca Renner, Louis
Neri, Dario
Puca, Emanuele
De Luca, Roberto
F. Gonzalez, Santiago
author2_role author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universitat Ramon Llull. IQS
dc.subject.none.fl_str_mv Administration route
Lymphoma
Colon adenocarcinoma
Immunocytokine
Fibronectin
Biodistribution
Intravital microscopy
Confocal microscopy
Limfomes
Adenocarcinoma colorectal
Immunocitoquímica
Fibronectines
Microscòpia confocal
577
616
topic Administration route
Lymphoma
Colon adenocarcinoma
Immunocytokine
Fibronectin
Biodistribution
Intravital microscopy
Confocal microscopy
Limfomes
Adenocarcinoma colorectal
Immunocitoquímica
Fibronectines
Microscòpia confocal
577
616
description Antibody-based targeted delivery of pharmaceuticals is an attractive approach to preferentially localize anti-cancer payloads to neoplastic lesions. The L19 antibody, specific for the extra domain B of fibronectin, is used in several antibody-cytokine fusion proteins investigated in clinical trials involving different tumor types. However, improving the efficacy of L19-based immunotherapies requires a detailed understanding of how delivery strategies influence intratumoral distribution and therapeutic outcomes. In this study, we investigate the biodistribution of the L19 antibody in murine models of primary Eμ-myc lymphoma and metastatic MC38 colon carcinoma. Using high-resolution in vivo and ex vivo microscopy, we compared subcutaneous (s.c.) and intravenous (i.v.) administration of L19, revealing rapid accumulation in tumor invaded lymph nodes within 10–30 min post injection. While both routes enabled initial tumor targeting, i.v. injection led to longer retention (up to 72 h) and greater selectivity for tumor associated blood vasculature. In contrast, s.c. delivery favored transient accumulation near lymphatic vessels and exhibited reduced tumor residence. These distribution patterns directly influenced the therapeutic efficacy of the L19-IL2 immunocytokine, which showed superior tumor control following i.v. administration in the MC38 model, consistent with enhanced blood vascularization in this model. Our findings demonstrate that L19 binds both blood and lymphatic vasculature in primary and metastatic disease, underscoring the critical impact of the administration route on antibody biodistribution, microanatomical localization, and therapeutic outcome. Moreover, this work highlights the utility of microscopy guided analysis in optimizing delivery strategies and supports the rationale for tailoring administration routes based on tumor type and vascular context in antibody-based theranostics.
publishDate 2026
dc.date.none.fl_str_mv 2026
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.14342/6014
https://doi.org/10.1016/j.tranon.2026.102698
url http://hdl.handle.net/20.500.14342/6014
https://doi.org/10.1016/j.tranon.2026.102698
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Translational Oncology 2026, 66, 102698
dc.rights.none.fl_str_mv © L'autor/a
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv © L'autor/a
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv p.10
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DAU Arxiu Digital de la Universitat Ramon Llull
instname:Universitat Ramon Llull (URL)
instname_str Universitat Ramon Llull (URL)
reponame_str DAU Arxiu Digital de la Universitat Ramon Llull
collection DAU Arxiu Digital de la Universitat Ramon Llull
repository.name.fl_str_mv
repository.mail.fl_str_mv
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