Angiogenic inhibitor pre-administration improves the therapeutic effects of immunotherapy.
Cancer Med
; 12(8): 9760-9773, 2023 04.
Article
en En
| MEDLINE
| ID: mdl-36808261
ABSTRACT
In lung cancer, immune checkpoint inhibitors (ICIs) are often inadequate for tumor growth inhibition. Angiogenic inhibitors (AIs) are required to normalize tumor vasculature for improved immune cell infiltration. However, in clinical practice, ICIs and cytotoxic antineoplastic agents are simultaneously administered with an AI when tumor vessels are abnormal. Therefore, we examined the effects of pre-administering an AI for lung cancer immunotherapy in a mouse lung cancer model. Using DC101, an anti-vascular endothelial growth factor receptor 2 (VEGFR2) monoclonal antibody, a murine subcutaneous Lewis lung cancer (LLC) model was used to determine the timing of vascular normalization. Microvessel density (MVD), pericyte coverage, tissue hypoxia, and CD8-positive cell infiltration were analyzed. The effects of an ICI and paclitaxel after DC101 pre-administration were investigated. On Day 3, increased pericyte coverage and alleviated tumor hypoxia represented the highest vascular normalization. CD8+ T-cell infiltration was also highest on Day 3. When combined with an ICI, DC101 pre-administration significantly reduced PD-L1 expression. When combined with an ICI and paclitaxel, only DC101 pre-administration significantly inhibited tumor growth, but simultaneous administration did not. AI pre-administration, and not simultaneous administration, may increase the therapeutic effects of ICIs due to improved immune cell infiltration.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Carcinoma Pulmonar de Lewis
/
Neoplasias Pulmonares
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Cancer Med
Año:
2023
Tipo del documento:
Article
País de afiliación:
Japón