Published in:
01-08-2016 | PHASE II STUDIES
A phase II trial of the BCL-2 homolog domain 3 mimetic AT-101 in combination with docetaxel for recurrent, locally advanced, or metastatic head and neck cancer
Authors:
Paul L. Swiecicki, Emily Bellile, Assuntina G. Sacco, Alexander T. Pearson, Jeremy M. G. Taylor, Trachette L. Jackson, Douglas B. Chepeha, Matthew E. Spector, Andrew Shuman, Kelly Malloy, Jeffrey Moyer, Erin McKean, Scott McLean, Ammar Sukari, Gregory T. Wolf, Avraham Eisbruch, Mark Prince, Carol Bradford, Thomas E. Carey, Shaomeng Wang, Jacques E. Nör, Francis P. Worden
Published in:
Investigational New Drugs
|
Issue 4/2016
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Summary
Background: AT-101 is a BCL-2 Homolog domain 3 mimetic previously demonstrated to have tumoricidal effects in advanced solid organ malignancies. Given the evidence of activity in xenograft models, treatment with AT-101 in combination with docetaxel is a therapeutic doublet of interest in metastatic head and neck squamous cell carcinoma. Patients and Methods: Patients included in this trial had unresectable, recurrent, or distantly metastatic head and neck squamous cell carcinoma (R/M HNSCC) not amenable to curative radiation or surgery. This was an open label randomized, phase II trial in which patients were administered AT-101 in addition to docetaxel. The three treatment arms were docetaxel, docetaxel plus pulse dose AT-101, and docetaxel plus metronomic dose AT-101. The primary endpoint of this trial was overall response rate. Results: Thirty-five patients were registered and 32 were evaluable for treatment response. Doublet therapy with AT-101 and docetaxel was well tolerated with only 2 patients discontinuing therapy due to treatment related toxicities. The overall response rate was 11 % (4 partial responses) with a clinical benefit rate of 74 %. Median progression free survival was 4.3 months (range: 0.7–13.7) and overall survival was 5.5 months (range: 0.4–24). No significant differences were noted between dosing strategies. Conclusion: Although met with a favorable toxicity profile, the addition of AT-101 to docetaxel in R/M HNSCC does not appear to demonstrate evidence of efficacy.