Benchmark Data
“Although these retrospective data should not be used to conclude that OS is superior with SRS, the findings of this study suggest that the primary trade-offs associated with SRS without WBRT, including a shorter TTCP, are similar to other settings in which SRS alone is well established by multiple randomized clinical trials,” the researchers write.
These data, they say, provide a “benchmark for SRS outcomes and offer support to first-line SRS as a treatment option in carefully selected patients with small-cell lung cancer.”
In a news release, senior author Tyler Robin, MD, University of Colorado School of Medicine, notes that paradigms for the treatment of SCLC are “evolving,” with the integration of immunotherapy into SCLC management, less use of WBRT, and guideline updates advising routine brain MRI surveillance for all patients.
“These changes may be expected to increase the identification of small-cell lung cancer patients with limited brain metastases who may be candidates for first-line SRS,” said Robin.
SRS made mainstream headlines in 2015 when former President Jimmy Carter was successfully treated for melanoma brain metastases with it. At the time, SRS was relatively new. The approach is more targeted and less toxic than traditional WBRT. Carter was treated at Emory University in Atlanta, Georgia.
SRS is now widely available in the United States, but adoption has been slow, Rusthoven told Medscape Medical News.
“Delayed adoption of SRS for SCLC is related to a number of factors, including a concern for short-interval CNS progression with SCLC histology and the historical exclusion of SCLC patients from the landmark randomized trials that established SRS alone,” he said.
“We hope that this study will contribute to an increased interest in the role of SRS for carefully selected SCLC patients and that it will offer support to ongoing and developing prospective clinical trials evaluating first-line SRS alone for SCLC,” Rusthoven added.
Prospective Data “Eagerly” Needed
The French editorial writers say prospective data are “eagerly needed” for this patient population.
SRS, they conclude, “might be a promising treatment option” for patients with SCLC with brain metastases, but larger studies are needed, as prophylactic cranial irradiation or prophylactic-intent WBRT has been shown to improve survival. “Hopefully, the work of Rusthoven et al will be used for the development of further prospective trials in patients with SCLC with brain metastases,” they write.
The study was funded by a grant from the University of Colorado Cancer Center. Rusthoven has received research funding from Takeda outside the submitted work as well as honoraria for educational talks from Genentech and AstraZeneca outside this work. The original article contains a complete list of author disclosures. Le Pechoux has received institutional honoraria for participation in advisory boards from AstraZeneca, Nanobiotix, and Roche; institutional honoraria for participation to educational meetings from Amgen, AstraZeneca, Medscape, and Eli Lilly and Company; and personal honoraria from prIME Oncology for participation in educational meetings. Levy has disclosed no relevant financial relationships.
This article first appeared on Medscape.com.