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A Small Molecule to Activate Cetuximab to Kill K-RAS Mutant Colorectal Tumors

Award Information

Agency:
Department of Health and Human Services
Branch:
N/A
Award ID:
Program Year/Program:
2012 / STTR
Agency Tracking Number:
R41CA174031
Solicitation Year:
2012
Solicitation Topic Code:
NCI
Solicitation Number:
PA12-089
Small Business Information
ARISAPH PHARMACEUTICALS, INC.
100 HIGH STREET BOSTON, MA 02110-2321
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 2012
Title: A Small Molecule to Activate Cetuximab to Kill K-RAS Mutant Colorectal Tumors
Agency: HHS
Contract: 1R41CA174031-01
Award Amount: $266,641.00
 

Abstract:

DESCRIPTION (provided by applicant): In the United States colorectal cancer (CRC) is the third leading cause of cancer mortality. Surgery is the primary treatment for early stage CRC; but adjuvant therapy is usually needed in advanced disease. Approximately 55% of CRC patients have metastatic disease for which the prognosis is poor despite incremental improvements due to introduction of irinotecan, oxaliplatin and targeted agents. The latter include the antibodies, cetuximab and panitumumab, initially approved by the FDA for patients who fail chemotherapy. The antibodies were selected for their ability to kill tumors by blockade of the epidermal growth factor receptor (EGFR). How- ever, although the anti-EGFR antibodies promised efficacy with reduced toxicity compared to chemotherapy, less than 12% of CRC patients respond to the antibodies as single agents. Resistance is largely due to mutations that activate the KRAS oncogene to drive CRC growth independently of EGFR signaling. The FDA has restricted cetuximab and panitumumab to treatment of metastatic CRC that expresses non-mutated KRAS. A new therapeutic approach in CRC might be to exploit an alternative mechanism of action for cetuximab called antibody-dependent cellular cytotoxicity (ADCC). Cetuximab canpotentially engage innate killer cells (K cells) to kill tumor cells by ADCC, regardless of whether or not the tumor has the KRAS mutation. However, when cetuximab is used as a single agent, little clinical benefit appears to come from ADCC. One way to improve the impact of ADCC would be to combine cetuximab with an agent that can enhance the efficiency of tumor killing by K cells. ARI-4175 has been selected for this purpose because preliminary results suggest it can stimulate cetuximab-mediated ADCC to produce tumor responses in KRAS mutant CRC in mice. The Specific Aim is to demonstrate that ARI-4175 can amplify cetuximab-mediated ADCC to produce significant tumor responses in nude mice challenged with a human KRAS mutant CRC cell line (HCT-116) that is resistant to cetuximab as a single agent. Tumor responses to treatment will be measured, tumor attack by K cells will be assessed by histology and immunostaining of responsive tumors, and the effect of experimental therapy on ADCC will be assayed ex vivo. The approach will seek to substantiate preliminary evidence suggesting that ARI-4175 activates a particular type of K cell-the natural killer (NK) cell-to kill tumors by ADCC. For ARI-4175 to be a viable drug candidate it must interact with cetuximab to produce significant tumor responses in the HCT-116 model with evidence of an immune mechanism of action. If the STTR Phase I study is successful, IND-enabling studies and the initiation of a phase 1 clinical trial of ARI-4175 will be proposed for STTR Phase II. PUBLIC HEALTH RELEVANCE: In 2012, 103,170 cases of colon cancer, 40,290 cases of rectal cancer, and 51,690 deaths from colorectal cancer (CRC, accounting for 9% of all cancer deaths) are predicted to occur in the United States. The anti- epidermal growth factor (EGFR) antibodies, cetuximab and panitumumab, appeared promising, initially, for treatment of metastatic CRC (mCRC) that is not amenable to surgery and resistant to chemotherapy; but it has turned out that less than 12% of patients respondto the antibodies as single agents, largely due to KRAS mutations that drive tumor growth independently of the EGFR. This project will test the feasibility of ARI-4175 as an immunotherapeutic agent that can enable cetuximab to successfully treat mCRC by the alternative mecha- nism of antibody-dependent cellular cytotoxicity, which is not affected by KRAS mutations.

Principal Investigator:

Barry Jones
617-986-4500
barry.jones4@verizon.net

Business Contact:

Joseph Suarex
617-986-4500
jsuarez@arisaph.com
Small Business Information at Submission:

ARISAPH PHARMACEUTICALS, INC.
100 HIGH STREET BOSTON, MA 02110-2321

EIN/Tax ID: 104345639
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Research Institution Information:
TUFTS UNIVERSITY BOSTON
TUFTS UNIVERSITY
Office of the Vice Provost 136 Harrison Avenue
BOSTON, MA 02111-
Contact: