Combination of CDK4/6 and mTOR Inhibitors Suppressed Doxorubicin-resistant Osteosarcoma in a Patient-derived Orthotopic Xenograft Mouse Model: A Translatable Strategy for Recalcitrant Disease.
Anticancer Res
; 41(7): 3287-3292, 2021 Jul.
Article
en En
| MEDLINE
| ID: mdl-34230123
ABSTRACT
BACKGROUND:
Osteosarcoma is the most frequent malignant bone neoplasm. The efficacy of combination therapy of a cyclin-dependent kinase 4/6 (CDK4/6) inhibitor and a mammalian-target-of-rapamycin (mTOR) inhibitor was previously reported in several cancer types. In the present study, we evaluated the efficacy of a combination of palbociclib (CDK 4/6 inhibitor) and everolimus (mTOR inhibitor) on an osteosarcoma patient-derived orthotopic xenograft (PDOX) mouse model. MATERIALS ANDMETHODS:
osteosarcoma PDOX mouse models were randomized into five treatment groups of seven mice each Group 1, untreated control; group 2, doxorubicin treatment; group 3, palbociclib treatment; group 4, everolimus treatment; group 5, palbociclib-everolimus combination treatment. Treatment duration was 2 weeks.RESULTS:
The palbociclib-everolimus combination reduced the tumor-volume ratio in the osteosarcoma PDOX mouse model compared with the control and doxorubicin (p=0.018). Everolimus alone also inhibited osteosarcoma PDOX growth compared to the control (p=0.04), but less than the combination. Palbociclib alone and doxorubicin were ineffective. There were no significant body-weight losses in any group. Only the palbociclib-everolimus combination induced extensive tumor necrosis observed histopathologically.CONCLUSION:
The present study demonstrated that the combination of CDK4/6 and mTOR inhibitors can be a translatable approach for doxorubicin-resistant osteosarcoma in the clinic.Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Neoplasias Óseas
/
Protocolos de Quimioterapia Combinada Antineoplásica
/
Osteosarcoma
/
Resistencia a Antineoplásicos
/
Quinasa 4 Dependiente de la Ciclina
/
Quinasa 6 Dependiente de la Ciclina
/
Serina-Treonina Quinasas TOR
Tipo de estudio:
Clinical_trials
Límite:
Adolescent
/
Animals
/
Female
/
Humans
Idioma:
En
Revista:
Anticancer Res
Año:
2021
Tipo del documento:
Article
País de afiliación:
Estados Unidos