VIENNA – Patients with metastatic non–small-cell lung cancer with high levels of PD-L1 who received first-line pembrolizumab treatment had clinically meaningful improvement in their quality of life, compared with patients randomized to chemotherapy, in a prespecified secondary analysis of data from the drug’s pivotal trial.
This boost in quality of life as well as other measures of health status add to the pivotal trial’s primary finding of significantly increased progression-free survival compared with chemotherapy, as well as previously-reported secondary findings of superior overall survival, objective response rate, and safety with pembrolizumab compared with chemotherapy (N Engl J Med. 2016 Nov 10;375[19]:1823-33), Julie R. Brahmer, MD, said at the World Conference on Lung Cancer, sponsored by the International Association for the Study of Lung Cancer.
The primary endpoint of the Study of Pembrolizumab Compared to Platinum-Based Chemotherapies in Participants With Metastatic Non–Small Cell Lung Cancer (KEYNOTE-024) showed an average 4.3-month increase in progression-free survival with pembrolizumab immunotherapy, compared with a standard chemotherapy regimen.
Improved quality of life on top of improved efficacy and safety is an important added benefit from pembrolizumab that should further spur its widespread adoption as first-line treatment for approved patients, Dr. Brahmer said in a video interview.
“When you talk about improving efficacy by months, patients and physicians want to also see improved quality of life,” said Dr. Brahmer, director of thoracic oncology at the Johns Hopkins Kimmel Cancer Center in Baltimore. “If symptoms are not improved or there are a ton of side effects with the treatment then use might be low.”
Based on its performance in KEYNOTE-024, pembrolizumab (Keytruda) received Food and Drug Administration approval on Oct. 24, 2016, as first-line treatment for patients with metastatic non–small-cell lung cancer that has a tumor proportion score of at least 50% for programmed death ligand 1 (PD-L1). Pembrolizumab is a monoclonal antibody that binds and blocks PD-1, the immune-cell receptor that tumor-cell PD-L1 binds to make immune cells less active. Other new immune checkpoint inhibitor drugs that act by blocking PD-1 or PD-L1 have shown similar quality of life benefits, she noted.
Routine availability of pembrolizumab as initial treatment for patients who have tumors with this level of PD-L1 expression (and also have no EGFR or ALK genomic aberrations) is shifting practice, Dr. Brahmer said.
“It’s catching on. The limitation right now is making sure patients get tested” for their PD-L1 tumor proportion score at the time they are first diagnosed. “Medical oncologists need to educate pathologists that we need this testing automatically, upfront. It’s not there yet,” she said.
Patients also are enthused. “There is a lot of chemo-exhaustion among patients. They are looking for something different, and something that uses their immune system makes sense.” But only about one quarter of patients have tumors with this level of PD-L1 expression; the others must start chemotherapy first before trying immunotherapy, unless they have an EGFR mutation. Out-of-pocket cost for pembrolizumab is also a major issues for many patients, she said.
KEYNOTE-024 randomized 305 patients at 102 international sites and followed patients for a median of 11 months. Dr. Brahmer and her associates made two primary analyses of patient-reported outcomes. One was measurement of global health status at 15 weeks after the start of treatment using the European Organization for the Research and Treatment of Cancer (EORTC) QLQ-C30 questionnaire designed to assess quality of life. Weighted averaging of the EORTC QCQ-C30 scores showed a mean improvement of 7.8 points (P = .002) in the pembrolizumab patients compared with the chemotherapy patients, a difference Dr. Brahmer called “clinically meaningful” as well as statistically significant.
A second analysis of patient-reported outcomes used a second EORTC instrument, the QLC-LC13, which combines assessment of cough, chest pain, and dyspnea. Treatment with pembrolizumab significantly reduced the time to deterioration as measured by this questionnaire by a relative 34%, (P = .029).
A third analysis looked at 15 individual function or symptom domains that make up the QLQ-C30. In general, these showed more improvements with pembrolizumab than with chemotherapy. One notable subcategory was fatigue, which showed significant improvement with pembrolizumab compared with a small worsening with chemotherapy.
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