Aims: To assess the impact of cytochrome P450 (CYP) 2C19 polymorphisms
on the clinical efficacy and safety of voriconazole. Methods: We
systematically searched PubMed, EMBASE, CENTRAL, ClinicalTrials.gov, and
three Chinese databases from their inception to March 18, 2021 using a
predefined search algorithm to identify relevant studies. Studies that
reported voriconazole-treated patients and information on CYP2C19
polymorphisms were included. The efficacy outcome was success rate. The
safety outcomes included overall adverse events, hepatotoxicity and
neurotoxicity. Results: A total of 20 studies were included.
Intermediate metabolizers (IMs) and Poor metabolizers (PMs) were
associated with increased success rates compared with normal
metabolizers (NMs) (risk ratio (RR): 1.18, 95% confidence interval
(CI): 1.03~1.34, I2=0%, p=0.02; RR: 1.28, 95%CI:
1.06~1.54, I2=0%, p=0.01). PMs were at increased risk
of overall adverse events in comparison with NMs and IMs (RR: 2.18,
95%CI: 1.35~3.53, I2=0%, p=0.001; RR: 1.80, 95% CI:
1.23~2.64, I2=0%, p=0.003). PMs demonstrated a trend
towards an increased incidence of hepatotoxicity when compared with NMs
(RR: 1.60, 95%CI: 0.94~2.74, I2=27%, p=0.08), although
there was no statistically significant difference. In addition, there
was no significant association between CYP2C19 polymorphisms and
neurotoxicity. Conclusions: IMs and PMs were at a significant higher
success rate in comparison with NMs. PMs were significantly associated
with an increased incidence of all adverse events compared with NMs and
IMs. Researches are expected to further confirm these findings.
Additionally, the relationship between hepatotoxicity and CYP2C19
polymorphisms deservers clinical attention.