Multi-agent chemotherapy in advanced soft tissue sarcoma (STS) – A systematic review and meta-analysis

Alona Zer*, Rebecca M. Prince, Eitan Amir, Albiruni R. Abdul Razak

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

Abstract

Background Despite a lack of improvement in overall survival (OS) with doxorubicin-based combinations over doxorubicin alone in advanced STS, the role of multi-agent chemotherapy remains poorly defined. Methods We conducted a systematic review and meta-analysis to evaluate benefits and harms of multi-agent chemotherapy in advanced STS. Eligible studies were randomized trials of chemotherapy in advanced STS comparing single agent to multi-agent therapy. Data from studies reporting a hazard ratio (HR) and 95% confidence intervals (CI) for OS and progression-free survival (PFS) were pooled in a meta-analysis. Meta-regression was utilized to explore the association between efficacy (OS and PFS) and both toxicity and dose intensity. Results We identified 22 trials published between 1974 and April 2016 and comprising 5044 patients. Overall, multi-agent chemotherapy was associated with improved OS (HR:0.79, p = 0.02), and borderline improvement in PFS (HR:0.86, p = 0.05). While the effect on OS was similar in trials with non-anthracycline controls compared to those with anthracycline controls (HR for OS 0.73 vs. 0.82, p for difference = 0.63) there was a non-significantly greater effect for multi-agent chemotherapy on PFS in non-anthracycline RCT (HR for PFS 0.73 vs. 0.91, p for difference = 0.13). Compared to studies with cytotoxic therapy-based multi-agent therapy, a non-significantly greater magnitude of effect among studies with biological/cytostatic experimental groups was seen (HR for OS 0.64 vs. 0.86, p for difference = 0.37). There was a borderline significant association between dose reductions (which were more common in combination arms) and worse PFS (beta = 0.70, p = 0.053). Conclusion Multi-agent chemotherapy is associated with a modest, but statistically significant improvement in outcomes in STS. Combining chemotherapy with non-cytotoxic agents might represent a promising strategy.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalCancer Treatment Reviews
Volume63
DOIs
StatePublished - Feb 2018

Keywords

  • Chemotherapy
  • Sarcoma
  • Soft tissue sarcoma

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