ALK-positive advanced non-small cell lung cancer patients with poor performance status: Outcomes in a real-world scenario.

BACKGROUND

Anaplastic lymphoma kinase (ALK) inhibitors have shown significant efficacy in ALK -rearranged non-small cell lung cancer (NSCLC) patients with good performance status (PS) in multiple randomised studies. However, there is limited data on patients with poor performance status.

PATIENTS AND METHODS

We carried out a retrospective analysis of prospectively collected data of patients with ALK-rearranged NSCLC and Eastern Cooperative Oncology Group (ECOG) PS of 2-4 treated at a single academic cancer centre from January 2013 to November 2018. The outcomes, progression-free survival (PFS) and overall survival (OS) were calculated from the date of diagnosis. SPSS version 20 was used for all statistical calculations.

RESULTS

Out of the total 441 ALK-positive patients, 97 (21.9%) had ECOG PS 2-4 (poor PS). The median PFS was 9.3 months (95% CI = 6.6-12.0) as compared to 14.9 months (95% CI = 13.4-16.4) for patients with a PS of 0-1 (HR = 1.38, 95% CI = 1.04-1.84, = 0.027). The corresponding median OS were 17.9 months (95% CI = 12.8-23.1) and 33.5 months (95% CI = 28.6-38.4), respectively (HR = 1.89, 95% CI = 1.36-2.62, < 0.001). Among poor PS patients, a subgroup of patients with PS 2 had median OS of 20.6 months (95% CI = 10.8-47.3) as compared to 8.6 months for PS 3-4 (95% CI = 7.8-27.8) (HR = 1.79, 95% CI = 1.01-3.20, = 0.047). The patients treated with upfront ALK inhibitors had better survival as opposed to those treated with chemotherapy. On multivariate analysis, PS 3-4, smoking, stage 4 and not using ALK inhibitors as first-line therapy were associated significantly with poor outcomes.

CONCLUSION

The ALK-rearranged NSCLC patients with poor PS derived significant benefits with ALK inhibitors. The outcomes were significantly poorer as compared to patients with PS 0-1; the subgroup of patients with PS 2 had better outcomes as compared to patients with PS 3-4.