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    Arvinas’ ARV-471 is an orally bioavailable CRBN-based ER PROTAC degrader for treating patients with ER+/HER2-breast cancer and the first PROTAC to enter Ph. III clinical trials. This molecule one-pager serves as a reference guide, offering an overview of the scientific significance of Arvinas’ ARV-471 program. It includes links to key presentations, publications, patents, preclinical and clinical PK data summaries, and more.

    Molecule

    Inavolisib is a PI3Kα isoform-selective kinase inhibitor and monovalent degrader of the mutant p110α catalytic subunit of mutant PI3Kα. The molecule selectively depletes mutant p110α in cancer cells with active RTK (receptor tyrosine kinase) signaling and is in several ongoing or planned Ph. III trials for breast cancer. In October 2024, it received FDA approval for use in combination with palbociclib and fulvestrant to treat adults with endocrine-resistant, PIK3CA-mutated, HR+/HER2- breast cancer. This article explains how it works, how it was discovered, and why it matters.

    Article

    This summary of September's major clinical updates features FDA approvals, drug withdrawals, anticipated regulatory decisions, notable trial results, new NDA submissions, clinical trial setbacks, and the initiation of new clinical trials.

    Article

    In this article, you'll find a curated selection of >70 molecules from August that piqued our interest, highlights of some of our favorites, and explanations of why they're worth watching.

    Article

    This article highlights the key drug discovery patents published in August 2024, including AKR1C3-dependent KARS (not KRAS!) inhibitors for NRF2/KEAP1-mutated cancers and DHX9 helicase inhibitors of MSI-high tumors. It also covers the development of MK2 degraders for inflammatory diseases and small molecule IL-17A inhibitors that show promise in modulating inflammation. Additionally, we cover Roche’s take on Revolution Medicines’ macrocyclic pan-KRAS inhibitors, which show improved PK profiles, and novel non-hydroxamate LpxC inhibitors for treating Gram-negative bacterial infections.

    Molecule

    KEAP1 inhibition/NRF2 activation has been hotly pursued in recent years for immunology indications; however, in oncology, NRF2 degradation has been posited as a novel therapeutic mechanism for specific cancers. Vividion has already disclosed work on covalent KEAP1 inhibitors, but at the recent ACS Fall 2024 meeting, the structure and discovery story of their clinical oral covalent activator of KEAP1 were disclosed, identified through careful analysis of the data from their inhibitor screen.

    Molecule

    NDI-101150 is an oral HPK1 inhibitor discovered by Nimbus Therapeutics and is currently in Ph. I/II clinical trial in advanced solid tumors. HPK1 is a compelling immuno-oncology target due to its critical role in regulating T-cells, B-cells, and dendritic cell-mediated immune responses. HPK1-deficient mice demonstrate enhanced anti-tumor T-cell responses and resistance to tumor growth. In this article, we detail the discovery of NDI-101150, as highlighted by Nimbus at the ACS Fall 2024 First-Time Disclosures session, interim results from the clinic, and more.

    Article

    We know keeping up with the latest developments in drug discovery can be a challenge, so we’ve simplified the process for you. We’ve reviewed thousands of newly published patent documents to bring you a curated list of over 200 key patents released in August 2024. Each entry comes with detailed commentary to help you navigate the content quickly and efficiently.

    Molecule

    Arvinas’ ARV-393 is an orally bioavailable PROTAC that degrades BCL6 via CRBN-mediated ubiquitination and proteasomal degradation intended for the treatment of NHL. At the AACR San Diego 2024 meeting, Arvinas disclosed the structure and discovery story of this molecule, which exhibits first-in-class potential. This article covers the key SAR observations that led to the invention of this orally bioavailable PROTAC®, its performance in a triple-hit, high-grade BCL and R-CHOP-resistant cell line, and why sustaining BCL6 knockdown beyond 24 hours was critical for the success of this program.

    Molecule

    BridgeBio’s BBO-8520 is a selective, covalent KRAS(G12C) inhibitor which differentiates itself from the pack by engaging the (ON) state of the protein, potentially conferring increased clinical benefit in KRAS(G12C)-driven cancers, including overcoming resistance to current treatments. Disclosed at the 2024 AACR Annual Meeting in San Diego, is currently in a Ph. I trial in patients with advanced non-small-cell lung cancer. This article covers the structure, mechanism of action and preclinical efficacy that marks this compound out as one to watch.

    Article

    During Drug Hunter’s Flash Talks, experts talk in-depth about hot topics in drug discovery. These experts also share insights beyond the subjects of their presentations, such as how they got inspired to become a drug hunter, what their favorite molecule is, what excites them most in drug discovery today, and what advice they wish they could give their younger selves. Here is a quick look at some of these insightful nuggets from Flash Talks hosted between January and August 2024.

    Molecule

    PLX-4545 is an oral CRBN-based molecular glue degrader of IKZF2 in Ph. I trials. It potentially addresses anti-tumor immunity suppression within the TME, critical in checkpoint blocker resistance. Tumors use IKZF2 to regulate the function of regulatory T cells and inhibit effector T cells. IKZF2 depletion in regulatory T cells enhances the anti-tumor response. The discovery and structural data of PLX-4545 were presented by Kevin Freeman-Cook at the ACS Fall 2024 First-Time Disclosures session in Denver, CO. We are reporting the discovery story and its potential impact on immuno-oncology.

    Molecule

    BAY 2925976 is a novel oral ARα2C antagonist developed by Bayer for the treatment of OSA (obstructive sleep apnea), a widespread condition affecting nearly one billion people globally. Despite the availability of mechanical treatments like CPAP, poor adherence rates highlight the need for more effective interventions. BAY 2925976 demonstrated a preclinical proof of concept for ARα₂C modulation as a potential therapeutic approach for OSA. In this article, we detail the discovery of BAY 2925976, as highlighted by Michael Hahn at the ACS Fall 2024 First-Time Disclosures session in Denver, CO.

    Molecule

    In August 2024, seladelpar (LivdelziTM) became the first FDA-approved selective agonist of PPARδ (peroxisome proliferator-activated receptor δ), following an almost 20-year journey from the original discovery and patent publications. Originally developed by CymaBay in collaboration with Johnson & Johnson, approval was granted to Gilead Sciences following their February 2024 purchase of CymaBay Therapeutics for $4.3B. Seladelpar was approved as a second-line treatment for patients with primary biliary cholangitis.

    Molecule

    The recently released WHO INN proposed names list includes the structure and name of Structure Therapeutics’ oral small molecule GLP-1R agonist, aleniglipron (GSBR-1290). Seemingly emerging from a “fast-follower” program based on Chugai/Eli Lilly’s orforglipron, the compound includes an unusual phosphine oxide motif and has shown positive results on plasma glucose levels and bodyweight in a Ph. IIa study.

    Molecule

    Pfizer disclosed the structure and discovery of their oral small molecule BDK inhibitor/degrader, PF-07328948, during the ACS Fall 2024 First-Time Disclosures session in Denver. The team identified a thiophene carboxylic acid-based hit targeting an allosteric pocket on BDK. Through optimization, they overcame challenges such as potential IADRs and BDK-E2 complex stabilization. By manipulating the dihedral angle of the methoxy group, they enhanced binding interactions, verifying PF-07328948's unexpected mechanism of action in vivo. PF-07328948 is currently Ph. I trials.

    Article

    In this Flash Talk, Yoshihiro Ishihara discussed the beneficial effects of chloro and methoxy substituents on intermolecular interactions, as well as the unique advantages and disadvantages of employing these substituents in drug discovery.

    As part of our Flash Talk webinar series, we present a PDF of Yoshihiro Ishihara's slide deck and full text questions and answers from his talk, entitled "Roles of the Chloro and Methoxy Groups in Drug Discovery." Check out the recording of the talk on our Drug Hunter YouTube channel.

    Molecule

    RLY-2608 is an oral, mutant-selective PI3Kα allosteric inhibitor from Relay Therapeutics. Current FDA-approved PI3Kα modulator (alpelisib) and a clinically advanced molecule (inavolisib) are limited by their off-target toxicities associated with the inhibition of WT PI3Kα, leading to hyperglycemia and rash. RLY-2608 is currently in a Ph. I as a single agent and in combination with fulvestrant for HR+/HER2- breast cancer treatment. This article reviews the discovery of RLY-2608, its mechanism of mutant selectivity, how it compares to other molecules, recent clinical developments, and more.