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Published on: February 12, 2017
A randomized pilot study of SRL172 (Mycobacterium vaccae) in patients with small cell lung cancer (SCLC) treated with
L Assersohn1, B E Souberbielle, M E R O'Brien
1Royal Marsden Hospital NHS Trust, Sutton, Surrey, UK.
Background:
SRL172 is a suspension of heat killed Mycobacterium vaccae, that has been found to be a potent immunological adjuvant when used with autologous cells in animal models. This is a phase II study to test the clinical activity, feasibility and safety of combining SRL172 with chemotherapy to treat patients with small cell lung cancer (SCLC).
Methods:
Patients were randomized to receive chemotherapy with (n=14) or without (n=14) SRL172. The chemotherapy was either platinum-based (MVP, n=10) or anthracycline-based (ACE, n=18). SRL172 was given intradermally on day 0, weeks 4, 8 and then 3-6 monthly.
Results:
The treatment arms were well balanced for disease extent (43% with limited stage in each arm). The toxicity of chemotherapy and overall response at 12-15 weeks (57%) was the same for both treatment regimens. Median survival was 8.6 months and 12.9 for patients treated with chemotherapy alone and with the combination respectively (P=0.10). The survival trend was similar for both disease extent and chemotherapy regimen employed in favour of combination chemotherapy with SRL172.
Conclusions:
There is a trend to improved median survival in SCLC with the combination of chemotherapy and SRL172 with no increased toxicity and irrespective of drug regimen. A phase III study examining chemotherapy in combination with SRL172 in SCLC is now underway.
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