A feasibility study of combined epigenetic and vaccine therapy in advanced colorectal cancer with pharmacodynamic endpoint

Katherine M Bever, Dwayne L Thomas 2nd, Jiajia Zhang, Ernie A Diaz Rivera, Gary L Rosner, Qingfeng Zhu, Julie M Nauroth, Brian Christmas, Elizabeth D Thompson, Robert A Anders, Carol Judkins, Meizheng Liu, Elizabeth M Jaffee, Nita Ahuja, Lei Zheng, Nilofer S Azad, Katherine M Bever, Dwayne L Thomas 2nd, Jiajia Zhang, Ernie A Diaz Rivera, Gary L Rosner, Qingfeng Zhu, Julie M Nauroth, Brian Christmas, Elizabeth D Thompson, Robert A Anders, Carol Judkins, Meizheng Liu, Elizabeth M Jaffee, Nita Ahuja, Lei Zheng, Nilofer S Azad

Abstract

Epigenetic therapies may modulate the tumor microenvironment. We evaluated the safety and optimal sequence of combination DNA methyltransferase inhibitor guadecitabine with a granulocyte macrophage-colony-stimulating-factor (GM-CSF) secreting colon cancer (CRC) vaccine (GVAX) using a primary endpoint of change in CD45RO + T cells. 18 patients with advanced CRC enrolled, 11 underwent paired biopsies and were evaluable for the primary endpoint. No significant increase in CD45RO + cells was noted. Grade 3-4 toxicities were expected and manageable. Guadecitabine + GVAX was tolerable but demonstrated no significant immunologic activity in CRC. We report a novel trial design to efficiently evaluate investigational therapies with a primary pharmacodynamic endpoint.Trial registry Clinicaltrials.gov: NCT01966289. Registered 21 October, 2013.

Keywords: Colorectal cancer; Epigenetic therapy; GVAX; Immunotherapy.

Conflict of interest statement

Through a licensing agreement with Aduro Biotech, Dr. Jaffee and the Johns Hopkins University have the potential to receive royalties on the sale of GVAX. N. Ahuja has received grant funding from Cepheid and Astex and has served as consultant to Ethicon. She has licensed methylation biomarkers to Cepheid. No potential conflict of interest were disclosed by the other authors.

Figures

Fig. 1
Fig. 1
a Overall study design. b Treatment schema for Stage 1
Fig. 2
Fig. 2
Plot of CD45RO-positive cells per mm2 of tumor area as quantified by immunohistochemistry. Matched baseline and post-treatment measurements are connected by a line. In total, 17 samples were obtained at baseline and of those, 11 had matched post-treatment biopsies. 3 patients had 0 positive cells both at baseline and post-treatment, and 2 patients had 0 positive cells at baseline and no paired post-treatment biopsy. The two patients with change from absent infiltrate at baseline to mild to moderate infiltrate on treatment are indicated by a solid line. *Note: A very high pre-treatment measurement (125 CD45RO+ cells/mm2 at baseline) is excluded from this figure; the patient had no corresponding post-treatment sample

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Source: PubMed

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