Title:Efficacy and Safety of Phosphatidylinositol 3-kinase Inhibitors for
Patients with Breast Cancer: A Systematic Review and Meta-analysis of
Randomized Controlled Trials
Volume: 24
Issue: 9
Author(s): Yi Wang, Xianling Du, Hongqiang Xin and Ruimin Xu*
Affiliation:
- Department of Anorectal, Shanghai Pudong New Area Hospital of Traditional Chinese Medicine, Shanghai City, 212000, China
Keywords:
Breast cancer, meta-analysis, phosphatidylinositol 3-kinase inhibitors, systematic review, overall survival, progression free survival.
Abstract:
Background: Phosphatidylinositol 3-kinase (PI3K) inhibitors belong to the class of
drugs that inhibit the activity of the PI3K protein, which is commonly overexpressed in breast cancer
cells. However, there is a need to summarize the evidence to provide conclusive advice on the
benefit of PI3K inhibitors in breast cancer patients. Therefore, this review assessed the effectiveness
and safety of the PI3K inhibitors amongst breast cancer patients.
Methods: Searches were made in PubMed Central, EMBASE, MEDLINE, SCOPUS, CENTRAL,
WHO trial registry and Clinicaltrials.gov up to December 2022. Meta-analysis was executed using
the random-effects model. Pooled hazard ratio (HR)/risk ratio (RR) was reported with 95% confidence
intervals (CIs).
Results: In total, 13 studies were included in the analysis. Most were multi-country studies and
had a higher risk of bias. Regarding the efficacy parameters, pooled HR for progression-free survival
was 0.79 (95%CI: 0.67-0.92), pooled RR for complete response was 1.54 [95%CI: 1.14 to
2.09], partial response was 1.18 [95%CI: 0.87-1.61], overall response was 1.20 [95%CI:
0.93-1.56], stable disease was 1.09 [95%CI: 0.78-1.53], progressive disease was 0.80 [95%CI:
0.74 to 0.87], and clinical benefit was 1.08 [95%CI: 0.80-1.49]. For safety parameters, pooled RR
for hyperglycemia was 4.57 [95%CI: 3.15-6.62], and gastrointestinal toxicity was 1.82 [95%CI:
1.56 to 2.14].
Conclusion: PI3K inhibitors had better efficacy than the present standard of concern for patients
with breast cancer, especially among patients with PIK3CA mutations. Hence, clinicians and oncologists
can provide this drug for the target population with extra caution for diabetes patients.