Endocyte to Announce Updated Data on EC1456 and EC1169 at the 2017 American Society of Clinical Oncology (ASCO) Annual Meeting

On May 26, 2017 Endocyte, Inc. (NASDAQ:ECYT), a leader in developing targeted small molecule drug conjugates (SMDCs) and companion imaging agents for personalized therapy, reported that two posters will be presented on its lead, clinical-stage assets, EC1456 and EC1169, at the 2017 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting being held June 2 – 6, 2017, in Chicago (Press release, Endocyte, MAY 26, 2017, View Source [SID1234519303]).

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Updated data will be presented on EC1456-01, a two part phase 1 dose escalation (Part A) and expansion (Part B) study. The presentation includes data for 87 Part A treated patients with advanced solid tumors and 6 Part B treated patients with FR-positive non-small cell lung cancer (NSCLC) as of the data cutoff on May 18, 2017. All patients were imaged to assess folate receptor expression with 99mTc-etarfolatide (FR expression not an eligibility criteria for Part A). Preliminary data from our first patient enrolled in the EC1456 ovarian surgical study, EC1456-02, will also be presented.

An update also will be provided for EC1169-01, a two-part phase 1 dose escalation (Part A) and expansion (Part B) study in patients with metastatic castration-resistant prostate cancer (mCRPC). The presentation includes data for the expansion phase (Part B) for 24 taxane-exposed mCRPC patients and 16 taxane-naïve mCRPC patients as of the data cutoff on May 15, 2017. All patients were imaged to assess PSMA expression with 99mTc-EC0652 (PSMA expression not an eligibility criteria).

The posters will be available on Endocyte’s website following presentation at the conference.

Presentations are as follows:

Abstract #: 2576
Title: Phase 1 dose escalation study of the folate receptor-targeted small molecule drug conjugate EC1456
Presenter: Dr. Wael Harb, Horizon Oncology Center
When: Monday, June 5, 8:00 a.m. – 11:30 a.m. CDT
Session Title: Poster Session: Developmental Therapeutics—Clinical Pharmacology and Experimental Therapeutics


Abstract #: 5038
Title: Phase 1 study of the PSMA-targeted small-molecule drug conjugate EC1169 in patients with metastatic castrate-resistant prostate cancer (mCRPC)
Presenter: Dr. Michael Morris, Memorial Sloan Kettering Cancer Center
When: Monday, June 5, 1:15 p.m. – 4:45 p.m. CDT
Session Title: Poster Session: Genitourinary (Prostate) Cancer

About EC1456

EC1456 is an investigational therapeutic SMDC constructed of a high affinity FR-targeting ligand conjugated through a spacer and bioreleasable linker system to a potent cytotoxic microtubule inhibitor, tubulysin B hydrazide (TubBH). Patient FR-status is determined using the investigational companion imaging agent, etarfolatide. EC1456 is currently being evaluated in a phase 1 study in patients with advanced solid tumors (Part A) and FR-positive NSCLC (Part B) (ClinicalTrials.gov Identifier: NCT01999738) and a phase 1 exploratory study in patients with ovarian cancer undergoing surgery (ClinicalTrials.gov Identifier: NCT03011320).

About EC1169

EC1169 is an investigational therapeutic SMDC constructed of a high affinity prostate specific membrane antigen (PSMA)-targeting ligand conjugated through a bioreleasable linker system to a potent microtubule inhibitor, TubBH. Patient PSMA-status is determined using the investigational companion imaging agent, EC0652. EC1169 is currently being evaluated in a phase 1 study in patients with metastatic castration-resistant prostate cancer (mCRPC) (ClinicalTrials.gov Identifier: NCT02202447).