HLD-0915 / Halda Therap - LARVOL DELTA

An oral prostate cancer RIPTAC therapeutic in phase 1 for metastatic castrate resistant prostate cancer (mCRPC). (ASCO 2025) - P1/2 | "Cohort 1 enrollment begins in January 2025. The Phase 2 portion of the study will confirm the RP2D and clinical activity in up to 3 cohorts which will be decided in the future based on emerging data."

Metastases • P1 data • Castration-Resistant Prostate Cancer • Genito-urinary Cancer • Oncology • Oral Cancer • Prostate Cancer • Solid Tumor

Halda Therapeutics Announces First Patient Dosed in Phase 1/2 Clinical Trial Evaluating HLD-0915 in Metastatic Castration-Resistant Prostate Cancer (Businesswire) - "Halda Therapeutics...announced that the first patient has been dosed in the first-in-human Phase 1/2 clinical trial (NCT06800313) to evaluate the safety and tolerability of HLD-0915 in the treatment of metastatic castration-resistant prostate cancer (mCRPC)....The Phase 1/2 open label, multi-center clinical trial is designed to evaluate the safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and anti-tumor activity of orally administered, single-agent HLD-0915 in mCRPC patients....The Phase 1/2 clinical study could enroll up to 80 mCRPC patients."

Trial status • Castration-Resistant Prostate Cancer

A Study of HLD-0915 in Patients with Metastatic Castration Resistant Prostate Cancer (mCRPC) (clinicaltrials.gov) - P1/2 | N=33 | Recruiting | Sponsor: Halda Therapeutics OpCo, Inc. | Not yet recruiting ➔ Recruiting

Enrollment open • Castration-Resistant Prostate Cancer • Genito-urinary Cancer • Oncology • Prostate Adenocarcinoma • Prostate Cancer • Solid Tumor

A Study of HLD-0915 in Patients with Metastatic Castration Resistant Prostate Cancer (mCRPC) (clinicaltrials.gov) - P1/2 | N=33 | Not yet recruiting | Sponsor: Halda Therapeutics OpCo, Inc.

New P1/2 trial • Castration-Resistant Prostate Cancer • Genito-urinary Cancer • Oncology • Prostate Adenocarcinoma • Prostate Cancer • Solid Tumor

Halda Therapeutics Secures $126 Million Financing to Advance RIPTAC Cancer Therapies into the Clinic for Major Solid Tumors (Businesswire) - "Halda Therapeutics...announced that it has raised new financing of $126 million in a Series B extension...Including this financing, Halda has raised $202 million to date from investors. Proceeds from the financing will be used to advance two RIPTAC candidates into clinical trials for patients with prostate cancer and breast cancer, initially in the metastatic setting where drug resistance to standard of care is prevalent. Halda’s lead RIPTAC therapeutic, HLD-0915, is expected to initiate a Phase 1 clinical trial in the first half of 2025 for the treatment of patients with metastatic, castration-resistant prostate cancer (mCRPC). The financing will also support the clinical development of a second RIPTAC therapeutic for metastatic breast cancer."

Financing • New P1 trial • Breast Cancer • Castration-Resistant Prostate Cancer • Genito-urinary Cancer • Metastatic Castration-Resistant Prostate Cancer • Oncology • Prostate Cancer • Solid Tumor

Halda Therapeutics Announces Publication in Cell Chemical Biology Demonstrating Proof-of-Mechanism and Pharmacology of RIPTAC Therapeutics for Precision Treatment of Cancer (Businesswire) - "The publication details several chemical biology approaches using a model with a HaloTag‑FKBP target protein to dissect the mechanism of action and pharmacology of RIPTAC molecules. Key findings from the study include: RIPTAC therapeutics demonstrated selective anti-proliferative activity in cells expressing the target protein; A ternary complex formed by the target protein, the RIPTAC molecule, and a pan-essential protein abrogated the function of the essential protein selectively in target-expressing cells, causing cell death; Several different pan-essential cellular proteins were shown to be amenable for selective cancer cell killing when incorporated into RIPTAC ternary complexes."

Preclinical • Oncology

Prostate cancer RIPTAC™ therapeutics demonstrate activity in preclinical models of Enzalutamide-resistant prostate cancer (AACR 2023) - "RIPTACs were optimized for oral bioavailability, and tumor ternary complex formation in prostate cancer cell line-derived xenograft models. RIPTAC therapeutics display nanomolar in vitro potency in AR:RIPTAC:EP ternary complex formation, which results in abrogation of the EP function and antiproliferative activity in prostate cancer cell lines, but not in AR-knockout control cells. Taken together, our in vitro mechanistic data and in vivo PD/efficacy observations in multiple prostate cancer models support further investigation of prostate cancer RIPTAC therapeutics as a novel heterobifunctional therapeutic modality in mCRPC."

Preclinical • Genito-urinary Cancer • Oncology • Prostate Cancer • Solid Tumor • AR • CASP3 • CASP7

Halda Therapeutics Presents Preclinical Data for RIPTAC Therapeutics Demonstrating Oral Efficacy as a Monotherapy for the Treatment of Prostate Cancer (Businesswire) - "Halda Therapeutics...announced a poster presentation for its lead RIPTAC therapeutic program for prostate cancer at the annual meeting of the American Association for Cancer Research (AACR) being held in Orlando, Florida, from April 14-19, 2023. The preclinical data showed oral efficacy of the RIPTAC therapeutics as a monotherapy and demonstrated anti-tumor activity superior to the standard of care agent in prostate cancer, enzalutamide. Combination therapy with PARP inhibitors is also being explored and RIPTAC therapeutics may have a complementary mechanism."

Preclinical • Genito-urinary Cancer • Oncology • Prostate Cancer • Solid Tumor

Biotech Drug Shown to Kill Prostate Tumor Cells - "'Riptac therapeutics address a shortcoming shared by most current pharmaceutical modalities,' says Crews in a Halda Therapeutics statement, & namely, the reliance on oncogenic driver proteins which can result in drug resistance."

Media quote

An oral androgen receptor RIPTAC for prostate cancer. (ASCO-GU 2023) - " We describe here a novel orally bioavailable heterobifunctional small molecule AR RIPTAC that recruits an essential cellular protein (EP) into a stable ternary complex with AR, thereby inhibiting EP function and leading to cell death selectively in AR-positive cells... In summary, we report preclinical data on orally bioavailable heterobifunctional AR RIPTACs that are active in multiple prostate cancer models. The lead molecules are being evaluated in toxicology studies, with IND filing slated for 2024."

Genito-urinary Cancer • Oncology • Prostate Cancer • Solid Tumor • AR

Halda Therapeutics unveils its first pipeline data for RIPTAC therapeutics, a new drug modality, at ASCO GU Symposium (Businesswire) - "Halda Therapeutics...announced the first public presentation of data for a RIPTAC therapeutic from its pipeline at the 2023 American Society of Clinical Oncology Genitourinary (ASCO GU) Cancers Symposium being held in San Francisco on February 16-18. The poster presentation will describe preclinical data of an orally-available RIPTAC therapeutic for the treatment of prostate cancer, demonstrating anti-tumor activity superior to the standard of care agent in prostate cancer, enzalutamide, in an in vivo rodent model of enzalutamide insensitive prostate cancer, as well as demonstrating broad in vitro activity across prostate cell lines....Highlights from the presentation include the following results: In castrated mice bearing VCaP xenografts, the prostate cancer RIPTAC therapeutic resulted in tumor growth inhibition superior to enzalutamide, the standard of care agent for prostate cancer as well as broad in vitro activity across prostate cell lines."

Preclinical • Genito-urinary Cancer • Oncology • Prostate Cancer