- Key findings presented in poster discussion demonstrate clear abscopal effect of intratumoral tilsotolimod -
- Data demonstrate contribution of tilsotolimod to overcome resistance to ipilimumab in patients with low HLA-ABC expression -
- Company plans to provide additional clinical safety and efficacy data for up to 35 patients during the 4th quarter -
The poster, which was selected for a poster discussion session, highlighted additional analyses of data for 21 patients for whom efficacy and safety analysis were originally presented at the 2018
The new analyses address the potential of intramural tilsotolimod to induce an antitumor response in combination with ipilimumab in injected tumors as well as uninjected tumors via an abscopal effect. As previously reported the overall response rate (ORR, by RECIST 1.1) for these 21 patients was 39%. Notably, in 7 of the 8 responders tumor shrinkage was observed in both the injected and uninjected tumors. Tumor shrinkage at uninjected lesions was observed in an additional four patients who had not met the criteria for RECIST v.1.1 response status as of this analysis.
Clinical responses were seen in patients whose HLA-ABC RNA (MHC class I) expression is low at baseline. Rodig and colleagues1 have recently shown that robust MHC class I expression is required for anti-CTLA-4 activity. Our findings suggest that combining tilsotolimod with ipilimumab may overcome this resistance mechanism, and therefore, enhance clinical activity and increase the overall response rate compared to that expected with ipilimumab monotherapy.
The ILLUMINATE-204 trial is enrolling two distinct patient populations, both patients who are naïve to ipilimumab therapy (N=40; Primary Efficacy Endpoint Population) and patients who have prior ipilimumab experience (N=Up to 20; Secondary Efficacy Endpoint Population). Of the initial 21 patients available for efficacy evaluations 6 of 17 patients from the Primary Efficacy Endpoint Population and 2 of 4 patients from the Secondary Efficacy Endpoint Population achieved RECIST v.1.1 responses, further demonstrating a signal that tilsotolimod has the potential to help overcome prior ipilimumab resistance.
“The data presented at
“The clear demonstration of tumor shrinkage in uninjected tumors following the injection of a single tumor lesion with tilsotolimod, provides clinical confirmation of our translational data and addresses an important frequently asked question,” stated
The poster discussion is scheduled for
In addition to the poster discussion, the company also presented a Trials in
Copies of these poster presentations are currently available on Idera’s corporate website at http://www.iderapharma.com/our-approach/key-publications/.
4th Quarter Clinical Efficacy and Safety Update
Based on the timing of disease assessment visits, the company plans an additional data cut later this quarter for the ILLUMINATE-204 trial to provide an update on clinical efficacy and safety data for up to 35 patients, including overall response rate (ORR) for all patients as well as for the Primary and Secondary Efficacy Patient Populations.
About Tilsotolimod (IMO-2125)
Tilsotolimod is a TLR 9 agonist that received Fast Track Designation from the
The ILLUMINATE-204 study (2125-204) is for patients who have metastatic melanoma for whom treatment with an anti-PD-1 drug like Keytruda®** (pembrolizumab) or Opdivo®* (nivolumab) has failed. Melanoma is the most dangerous type of skin cancer. When it is metastatic, it means that the melanoma has spread to different parts of the body. ILLUMINATE-204 is a multi-center, two-arm Phase 1/2 study that tests the safety and effectiveness of tilsotolimod in combination with either ipilimumab (Yervoy®) or pembrolizumab (Keytruda®) for the treatment of patients with anti-PD-1 refractory metastatic melanoma.
For additional details about ILLUMINATE-204, please go to clinicaltrials.gov and search for study identifier NCT02644967.
The ILLUMINATE-301 study (2125-MEL-301) is for patients who have metastatic melanoma for whom treatment with an anti-PD-1 drug like Keytruda® (pembrolizumab) or Opdivo® (nivolumab) has failed. ILLUMINATE-301 is a global, multi-center, randomized Phase 3 study that compares the effectiveness and safety between two treatment groups: IMO-2125 combined with ipilimumab (Yervoy®) versus ipilimumab given alone.
For additional details about ILLUMINATE-301, please go to clinicaltrials.gov and search for study identifier NCT03445533.
About Metastatic Melanoma
Melanoma is a type of skin cancer that begins in a type of skin cell called melanocytes. As is the case in many forms of cancer, melanoma becomes more difficult to treat once the disease has spread beyond the skin to other parts of the body such as the lymphatic system, liver or other visceral organs (metastatic disease). Because melanoma occurs in younger individuals, the years of life lost to melanoma are also disproportionately high when compared with other cancers. Although melanoma is a rare form of skin cancer, it comprises over 75% of skin cancer deaths.
Harnessing the approach of the earliest researchers in immunotherapy and the Company’s vast experience in developing proprietary immunology platforms, Idera’s lead development program is focused on priming the immune system to play a more powerful role in fighting cancer, ultimately increasing the number of people who can benefit from immunotherapy.
Forward Looking Statements
This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements, other than statements of historical fact, included or incorporated in this press release, including statements regarding the Company's strategy, future operations, collaborations, intellectual property, cash resources, financial position, future revenues, projected costs, prospects, clinical trials, plans, and objectives of management, are forward-looking statements. The words "believes," "anticipates," "estimates," "plans," "expects," "intends," "may," "could," "should," "potential," "likely," "projects," "continue," "will," and "would" and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words.
*Yervoy (ipilimumab) and Opdivo (nivolimumab) are registered trademarks of
**Keytruda (pembrolizimab) is a registered trademark of
1 Rodig, S., et al., MHC proteins confer differential sensitivity to CTLA-4 and PD-1 blockade in untreated metastatic melanoma. Sci. Transl. Med. 10, eaar3342 (2018).
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Source: Idera Pharmaceuticals, Inc.