IMpower133: first-line atezolizumab plus chemotherapy in extensive-stage small-cell lung cancer

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By: scienterrific | Last updated: 11 October 2018 | In: Lung Cancer, Oncology, Chemotherapy, Immunotherapy

Article Keywords

Roche, atezolizumab, carboplatin, etoposide, Genentech, Tecentriq, Oncology, SCLC, PD-1, PD-L1

Atezolizumab (Tecentriq®, Roche/Genentech) plus standard chemotherapy for the first-line treatment of extensive-stage small-cell lung cancer (SCLC) was associated with a significantly longer overall survival (OS) and progression-free survival (PFS) when compared with chemotherapy alone.

“Enhancing tumour-specific T-cell immunity by inhibiting programmed death ligand 1 (PD-L1)-programmed death 1 (PD-1) signalling has shown promise in the treatment of extensive-stage small-cell lung cancer. Combining checkpoint inhibition with cytotoxic chemotherapy may have a synergistic effect and improve efficacy.”

IMpower133

The double-blind, placebo-controlled, Phase III IMpower133 (NCT02763579) trial randomly assigned 403 extensive-stage SCLC patients 1:1 to either receive four cycles of atezolizumab plus carboplatin and etoposide (N=201) or four cycles of placebo plus carboplatin and etoposide (N=202). Both arms were followed by maintenance atezolizumab or placebo according to the initial assignment. Treatment continued until unacceptable toxicities, disease progression (RECIST 1.1), or no additional clinical benefit. The composite primary endpoint included investigator-assessed PFS and OS in the intention-to-treat (ITT) population.

At median follow-up of 13.9 months, the median OS measured 12.3 months for the combination atezolizumab plus chemotherapy vs 10.3 months for placebo plus chemotherapy (HR=0.70; 95% CI, 0.54-0.91; p=0.007). The median PFS were 5.2 months and 4.3 months, respectively (HR=0.77; 95% CI, 0.62-0.96; p=0.02).

The authors reported that the safety of atezolizumab plus carboplatin and etoposide appeared consistent with the previously reported safety profile of each of the individual agents alone. No new safety signals were observed.

Reference

Horn L, et al. N Engl J Med. 2018;doi:10.1056/NEJMoa1809064.

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This article is not medical advice. Patients should seek personal assessment by a licenced specialist. Physicians are recommended to read the full publication(s) as cited in the article before making medical decisions. This article does not supersede nor replace the published article(s).

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