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Merck Serono, a division of Merck, Darmstadt, Germany, today announced detailed results from the randomised Phase III START* trial of its investigational MUC1 antigen-specific cancer immunotherapy L-BLP25 (formerly referred to as Stimuvax) in patients with unresectable, locally advanced Stage III non-small cell lung cancer (NSCLC). These results will be presented at the American Society of Clinical Oncology (ASCO) 2013 Annual Meeting in Chicago.
The primary endpoint of improving overall survival (OS) was not met. In a predefined subgroup of patients receiving initial concurrent chemoradiotherapy (CRT), a combination of chemotherapy and radiotherapy given at the same time, a median overall survival of 30.8 months versus 20.6 months was observed based on a post hoc analysis in patients treated with L-BLP25 versus placebo respectively (HR 0.78, 95% CI 0.64–0.95, p=0.016, n=806).
The results of the START trial will be presented during the Oral Abstract Session ‘Lung Cancer – Non-Small Cell Local-Regional/Small Cell/Other Thoracic Cancers from 09.45 am to 12.45 pm on Tuesday, June 4.
The START trial is assessing the safety, efficacy and tolerability of L-BLP25 in patients with unresectable, locally advanced Stage III NSCLC who have not progressed after initial CRT, which is the current standard of care. Before receiving treatment with either L-BLP25 or placebo in the START trial, two-thirds of patients had received concurrent CRT and one-third had received sequential CRT (radiotherapy started after completion of chemotherapy).
The trial did not meet its primary objective of demonstrating a significantly improved OS with L-BLP25 compared to placebo in the primary analysis study population (n=1,239). Median OS was 25.6 months for patients in the L-BLP25 group compared with 22.3 months for those in the placebo group (adjusted HR 0.88, 95% CI 0.75–1.03, p=0.123).
Injection site reactions, a pre-defined group of adverse events, occurred in 17.3% of patients in the L-BLP25 group and in 11.9% of patients in the placebo group. Flu-like symptoms, another pre-defined group of adverse events, observed within two days after subcutaneous injection of study medication occurred in 10.9% of patients in the L-BLP25 group and in 9.9% of patients in the placebo group.
Potentially immune-related diseases or events occurred at similar frequencies in both treatment groups. The most common adverse events (>10%) in subjects allocated to L-BLP25 were cough, dyspnea, fatigue, back pain, nausea, chest pain, nasopharyngitis, headache, decreased appetite and arthralgia, and in those allocated to placebo were cough, dyspnea, fatigue, back pain and headache. The most common grade 3 or 4 adverse event in both treatment groups was dyspnea (L-BLP25 group 4.8%, placebo group 4.4%).
In a post hoc analysis of the predefined subgroup of patients receiving initial concurrent CRT (n=806), patients receiving L-BLP25 had a median OS of 30.8 months compared to patients receiving placebo, who had a median OS of 20.6 months [HR 0.78; 95% CI 0.64–0.95; p=0.016]). In patients receiving sequential CRT followed by L-BLP25 or placebo a median OS of 19.4 months was observed for the L-BLP25 group compared with 24.6 months for the placebo group (n=433; HR 1.12; 95% CI 0.87–1.44; p=0.38).
Predefined subgroup analyses included, among others, disease stage (IIIA or IIIB), response to initial CRT (stable disease versus objective response), type of initial CRT (concurrent versus sequential) and geographic region.
“While the results from the primary analysis population were certainly not what we hoped for, I am encouraged by the results seen in the subgroup of patients receiving concurrent CRT followed by L-BLP25, particularly as concurrent CRT is the standard of care recommended for patients with unresectable Stage III NSCLC in both the NCCN† and ESMO‡ guidelines,” said Dr. Charles Butts, Cross Cancer Institute, University of Alberta, Edmonton, Canada, clinical investigator and member of the START trial’s steering committee. “This is the first time that an antigen-specific cancer immunotherapy has shown this effect in a substantial subgroup of NSCLC patients who are usually only observed following chemoradiotherapy.”
Dr. Annalisa Jenkins, Head of Global Drug Development and Medical for Merck Serono, said: “We believe the results from the START trial offer scientific insights to the medical community on the potential clinical utility of immunotherapy approaches in oncology. As we better understand the biology behind immune responses in patients living with cancer, our learnings can be applied to advance progress in this field.”
L-BLP25 is an investigational MUC1 antigen-specific cancer immunotherapy designed to stimulate the body’s immune system to identify and target cancer cells expressing the cell-surface glycoprotein MUC1.1,2 MUC1 is expressed in many cancers, such as NSCLC, and has multiple roles in tumour growth and survival.(1,3)
Globally, lung cancer is the most common cause of cancer-related deaths in men and the second most common in women, responsible for almost twice as many deaths as both breast and prostate cancer combined.(4) NSCLC is the most common type of lung cancer, accounting for 80–85% of all lung cancers, and locally advanced or Stage III disease accounts for approximately 30% of patients with NSCLC.(5,6) Unfortunately, at diagnosis, most patients have advanced or metastatic disease with a very poor prognosis.(7) There is an especially urgent and ongoing need for new approaches for patients with advanced, unresectable NSCLC.
*START: Stimulating Targeted Antigenic Responses To NSCLC
†NCCN guidelines: National Compendium Cancer Network Guidelines Version 2.2013 Non-Small Cell Lung Cancer
‡ESMO guidelines: Early stage and locally advanced (non-metastatic) non-small-cell lung cancer: ESMO Clinical Practice Guidelines for diagnosis, treatment and follow-up
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