CDK4/6i can replace chemotherapy in ER+/HER2− advanced BC with impending or established visceral crisis

Key clinical point: Compared with paclitaxel chemotherapy, treatment with first-line cyclin-dependent kinase 4/6 inhibitors (CDK4/6i) demonstrated better survival outcomes and a similar speed of improvement in patients with estrogen receptor-positive (ER+)/human epidermal growth factor receptor 2-negative (HER2−) advanced breast cancer (BC) who had a visceral crisis (VC) or impending VC (IVC).

Major finding: CDK4/6i vs paclitaxel improved time-to-treatment failure (hazard ratio [HR] 0.33; P  =  .0002), progression-free survival (HR 0.38; P  =  .002), and overall survival (HR 0.37; P  =  .002) outcomes. The median time to first improvement in IVC/VC was comparable between the treatment groups (P  =  .773).

Study details: Findings are from a retrospective study including 59 patients with ER+/HER2− advanced BC who had either VC or IVC, of whom 27 patients received first-line treatment with CDK4/6i + endocrine therapy and 32 patients who were treated with weekly paclitaxel.

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Disclosures: This study did not receive any funding. Two authors declared having joint working agreements with or receiving honoraria, conference fees, travel expenses, or research funding from various sources.

Source: Behrouzi R et al. CDK4/6 inhibitors versus weekly paclitaxel for treatment of ER+/HER2− advanced breast cancer with impending or established visceral crisis. Breast Cancer Res Treat. 2023 (Aug 16). doi: 10.1007/s10549-023-07035-6