Abstract
Background:
Cabozantinib is approved, in various settings, for the treatment of renal
cell carcinoma, medullary thyroid cancer, and hepatocellular carcinoma, and
it has been investigated for the treatment of other cancers. With the
available evidence and the real-world performance of cabozantinib compared
with clinical trial data, we performed a systematic review of cabozantinib
monotherapy as treatment for solid tumors in adults.
Methods:
This study was designed in accordance with Preferred Reporting Items for
Systematic Reviews and Meta-Analyses and registered with PROSPERO
(CRD42020144680). We searched for clinical and observational studies of
cabozantinib monotherapy for solid tumors using Embase, MEDLINE, and
Cochrane databases (October 2020), and screened relevant congress abstracts.
Eligible studies reported clinical or safety outcomes, or biomarker data.
Small studies (n < 25) and studies of cabozantinib
combination therapies were excluded. Quality was assessed using National
Institute for Health and Care Excellence methodology, and study
characteristics were described qualitatively.
Results:
Of 2888 citations, 114 were included (52 randomized studies, 29 observational
studies, 32 nonrandomized phase I or II studies or pilot trials, and 1
analysis of data from a randomized study and a nonrandomized study). Beyond
approved indications, other tumors studied were castration-resistant
prostate cancer, urothelial carcinoma, Ewing sarcoma, osteosarcoma, uveal
melanoma, non-small-cell lung cancer, Merkel cell carcinoma, glioblastoma,
pheochromocytomas and paragangliomas, cholangiocarcinoma, gastrointestinal
stromal tumor, colorectal cancer, salivary gland cancer, carcinoid and
pancreatic neuroendocrine tumors, and breast, endometrial and ovarian
cancers. The most common adverse events were hypertension, diarrhea, and
fatigue.
Conclusion:
The identified evidence demonstrates the positive efficacy/effectiveness of
cabozantinib monotherapy in various solid tumor types, with safety findings
being consistent with those observed with other VEGFR-targeting tyrosine
kinase inhibitors. When available, real-world findings were consistent with
the data reported from clinical trials. A limitation of this review is the
high proportion of abstracts; however, this allowed us to capture the most
up-to-date findings.
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