Aileron Shares Fall After Early Data From Chemoprotective Agent In Lung Cancer Setting

  • Aileron Therapeutics ALRN announced interim data from its Phase 1b chemoprotection trial of patients with advanced p53-mutated non-small cell lung cancer (NSCLC) undergoing treatment with first-line carboplatin plus pemetrexed with or without immune checkpoint inhibitors. 
  • ALRN-6924-treated patients could stay on chemotherapy treatment longer, completing 93% of the first four cycles of carboplatin/pemetrexed administered compared to 78% on placebo.
  • This imbalance of completed cycles may have introduced a bias against ALRN-6924 on the composite primary endpoint. 
  • The imbalance increases further when looking at percentages of patients completing six cycles of treatment (79% on ALRN-6924 versus 57% on placebo). 
  • This is reflected in the progression-free survival, which was 4.6 months in the ALRN-6924 arm versus 3.2 months in the placebo arm. 
  • ALRN-6924-treated patients demonstrated 56% of cycles free from serious/severe hematologic toxicities and related events compared to 50% on placebo.
  • Aileron plans to stop further enrollment in the NSCLC trial and apply key learnings to strengthen the Phase 1b breast cancer trial.
  • Additionally, Aileron plans to modify the dosing strategy for the trial and will not further enroll additional patients in the ongoing 0.3 mg/kg and 0.6 mg/kg dose cohorts.
  • Price Action: ALRN shares are down 33.60% at $0.27 during the premarket session on the last check Wednesday.

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