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Jeyaraju DV, Alapa M, Polonskaia A, Risueño A, Subramanyam P, Anand A, Ghosh K, Kyriakopoulos C, Hemerich D, Hurren R, Wang X, Gronda M, Ahsan A, Chiu H, Thomas G, Lind EF, Menezes DL, Schimmer AD, Hagner PR, Gandhi A, Thakurta AG. Extended exposure to low doses of azacitidine induces differentiation of leukemic stem cells through activation of myeloperoxidase. Haematologica 2024; 109:1082-1094. [PMID: 37941406 PMCID: PMC10985425 DOI: 10.3324/haematol.2023.283437] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 10/30/2023] [Indexed: 11/10/2023] Open
Abstract
Oral azacitidine (oral-Aza) treatment results in longer median overall survival (OS) (24.7 vs. 14.8 months in placebo) in patients with acute myeloid leukemia (AML) in remission after intensive chemotherapy. The dosing schedule of oral-Aza (14 days/28-day cycle) allows for low exposure of Aza for an extended duration thereby facilitating a sustained therapeutic effect. However, the underlying mechanisms supporting the clinical impact of oral-Aza in maintenance therapy remain to be fully understood. In this preclinical work, we explore the mechanistic basis of oral-Aza/extended exposure to Aza through in vitro and in vivo modeling. In cell lines, extended exposure to Aza results in sustained DNMT1 loss, leading to durable hypomethylation, and gene expression changes. In mouse models, extended exposure to Aza, preferentially targets immature leukemic cells. In leukemic stem cell (LSC) models, the extended dose of Aza induces differentiation and depletes CD34+CD38- LSC. Mechanistically, LSC differentiation is driven in part by increased myeloperoxidase (MPO) expression. Inhibition of MPO activity either by using an MPO-specific inhibitor or blocking oxidative stress, a known mechanism of MPO, partly reverses the differentiation of LSC. Overall, our preclinical work reveals novel mechanistic insights into oral-Aza and its ability to target LSC.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Rose Hurren
- Princess Margaret Cancer Centre, Toronto, ON
| | | | | | | | | | | | - Evan F Lind
- Department of Molecular Microbiology and the Knight Cancer Institute, Oregon Health and Science University, Portland, OR
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Menezes DL, See WL, Risueño A, Tsai KT, Lee JK, Ma J, Khan R, Prebet T, Skikne B, Beach CL, Thakurta A, Gandhi A. Oral azacitidine modulates the bone marrow microenvironment in patients with acute myeloid leukaemia in remission: A subanalysis from the QUAZAR AML-001 trial. Br J Haematol 2023. [PMID: 36990798 DOI: 10.1111/bjh.18783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 03/17/2023] [Accepted: 03/17/2023] [Indexed: 03/31/2023]
Abstract
Oral azacitidine (Oral-AZA) maintenance therapy improved relapse-free (RFS) and overall survival (OS) significantly versus placebo for AML patients in remission after intensive chemotherapy (IC) in the phase 3 QUAZAR AML-001 study. Immune profiling was performed on the bone marrow (BM) at remission and on-treatment in a subset of patients with the aim of identifying prognostic immune features and evaluating associations of on-treatment immune effects by Oral-AZA with clinical outcomes. Post-IC, increased levels of lymphocytes, monocytes, T cells and CD34 + CD117+ BM cells were prognostically favourable for RFS. CD3+ T-cell counts were significantly prognostic for RFS in both treatment arms. At baseline, high expression of the PD-L1 checkpoint marker was identified on a subset of CD34 + CD117+ BM cells; many of which were PD-L2+. High co-expression of T-cell exhaustion markers PD-1 and TIM-3 was associated with inferior outcomes. Oral-AZA augmented T-cell numbers during early treatment, increased CD4+:CD8+ ratios and reversed T-cell exhaustion. Unsupervised clustering analysis identified two patient subsets defined by T-cell content and expression of T-cell exhaustion markers that were enriched for MRD negativity. These results indicate that Oral-AZA modulates T-cell activity in the maintenance setting of AML, and these immune-mediated responses are associated with clinical outcomes.
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Affiliation(s)
| | - Wendy L See
- Bristol Myers Squibb, San Francisco, California, USA
| | | | | | - Jae K Lee
- Bristol Myers Squibb, Lawrenceville, New Jersey, USA
| | - Johnny Ma
- Bristol Myers Squibb, Summit, New Jersey, USA
| | - Rida Khan
- Bristol Myers Squibb, Summit, New Jersey, USA
| | | | - Barry Skikne
- Bristol Myers Squibb, Summit, New Jersey, USA
- University of Kansas Medical Center, Kansas City, Kansas, USA
| | - C L Beach
- Bristol Myers Squibb, Summit, New Jersey, USA
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3
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Menezes DL, See WL, Risueno A, Ma J, La Torre I, Skikne B, Beach CL, Kumar K, Thakurta A. Abstract 505: Oral azacitidine modulates the immune microenvironment in acute myeloid leukemia (AML) patients in remission: A subanalysis from the QUAZAR AML-001 Trial. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
BACKGROUND The immunologic effects of maintenance therapy in patients (pts) with AML in remission are not well-characterized but of high clinical interest, as rapid recovery of bone marrow (BM) after intensive chemotherapy (IC) may help delay relapse. Post IC, immunological interactions in the BM microenvironment present several immunosuppressive mechanisms. PD-L1 is commonly overexpressed on AML blasts, which is associated with worse prognosis. Oral azacitidine (Oral-AZA [CC-486]) is a hypomethylating agent recently approved in the US for pts with AML in complete remission (CR) or CR with incomplete hematologic recovery (CRi). To better understand the effects of Oral-AZA on immune cells, checkpoint expression of PD-L1/2 on AML blasts and normal myeloid progenitors (MPs), and the kinetics of T cell recovery and activation/exhaustion (eg, PD1, TIM3) were assessed.
METHODS Biomarker-evaluable pts aged ≥ 55 years with AML were randomized 1:1 to Oral-AZA 300 mg (n=56) or placebo (PBO, n=52) post IC within 4 months of achieving CR. Flow cytometry evaluations of BM aspirates were performed at screening (ie, baseline [BL]), every 3 cycles until cycle 24 and every 6 cycles thereafter to cycle 36, or as clinically indicated. Correlative analyses of baseline immune parameters with median (med) relapse-free survival (RFS) were computed using Kaplan-Meier methods.
RESULTS In the biomarker-evaluable pts, PD-L1 and PD-L2 expression at BL were higher on AML blasts (med intensity 7.1 and 2.9) than normal MPs (0.7 and 1.6). Most AML blasts were PD-L2+ (79%), whereas only 1.9% were PD-L1+. When stratified by the med, higher BL CD3 T cell numbers (as a % of total BM ) were associated with favorable RFS in both Tx arms (Oral-AZA: ≥ med, 562 days[d] and < med, 235d [P = .0308]; PBO: ≥ med, 325d and < med, 155d [P = .0391]). At cycle 3, pts in the Oral-AZA arm had a 1.7-fold increase in CD3 T cells from BL (PBO, 1.1; P = .0450), suggesting Oral-AZA can promote immunologic recovery during early Tx cycles. There was an inverse correlation between T cell exhaustion marker phenotypes (PD1/TIM3+) with CD4 (r = -.5967; P < .0001) and CD8 (r = -.2484; P = .0095) T cell numbers. An increase in RFS was seen in the PBO arm with lower PD1/TIM3+ CD4 numbers (< med, 429d; ≥ med, 155d; P = .0037), with a nominal increase observed in the Oral-AZA arm (< med, 428d; ≥ med, 303d; P = .6764). In a subset of pts, Oral-AZA appeared to suppress CD4 T cell exhaustion (PD1/TIM3+) compared with PBO.
CONCLUSIONS Pts in CR/CRi post-IC have a unique immune profile defined by high expression of PD-L1 on a subset of blasts and a high % of PD-L2+ blasts. A higher BL CD3 T cell count after IC in BM was prognostic. Additionally, Oral-AZA appears to contribute to an increase in T cells while also suppressing exhaustion, potentially promoting T cell signaling that could activate functional immune-mediated responses against residual leukemic cells.
Citation Format: Daniel L. Menezes, Wendy L. See, Alberto Risueno, Jianglin Ma, Ignazia La Torre, Barry Skikne, CL Beach, Keshava Kumar, Anjan Thakurta. Oral azacitidine modulates the immune microenvironment in acute myeloid leukemia (AML) patients in remission: A subanalysis from the QUAZAR AML-001 Trial [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 505.
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Affiliation(s)
| | | | - Alberto Risueno
- 2BMS Center for Innovation and Translational Research Europe (CITRE, a Bristol-Myers Squibb Company), Sevilla, Spain
| | | | | | - Barry Skikne
- 4Kansas University Medical Center, Kansas City, KS
| | - CL Beach
- 1Bristol Myers Squibb, Princeton, NJ
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Sheng Q, D'Alessio JA, Menezes DL, Karim C, Tang Y, Tam A, Clark S, Ying C, Connor A, Mansfield KG, Rondeau JM, Ghoddusi M, Geyer FC, Gu J, McLaughlin ME, Newcombe R, Elliot G, Tschantz WR, Lehmann S, Fanton CP, Miller K, Huber T, Rendahl KG, Jeffry U, Pryer NK, Lees E, Kwon P, Abraham JA, Damiano JS, Abrams TJ. PCA062, a P-cadherin Targeting Antibody-Drug Conjugate, Displays Potent Antitumor Activity Against P-cadherin-expressing Malignancies. Mol Cancer Ther 2021; 20:1270-1282. [PMID: 33879555 DOI: 10.1158/1535-7163.mct-20-0708] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 01/19/2021] [Accepted: 04/05/2021] [Indexed: 11/16/2022]
Abstract
The cell surface glycoprotein P-cadherin is highly expressed in a number of malignancies, including those arising in the epithelium of the bladder, breast, esophagus, lung, and upper aerodigestive system. PCA062 is a P-cadherin specific antibody-drug conjugate that utilizes the clinically validated SMCC-DM1 linker payload to mediate potent cytotoxicity in cell lines expressing high levels of P-cadherin in vitro, while displaying no specific activity in P-cadherin-negative cell lines. High cell surface P-cadherin is necessary, but not sufficient, to mediate PCA062 cytotoxicity. In vivo, PCA062 demonstrated high serum stability and a potent ability to induce mitotic arrest. In addition, PCA062 was efficacious in clinically relevant models of P-cadherin-expressing cancers, including breast, esophageal, and head and neck. Preclinical non-human primate toxicology studies demonstrated a favorable safety profile that supports clinical development. Genome-wide CRISPR screens reveal that expression of the multidrug-resistant gene ABCC1 and the lysosomal transporter SLC46A3 differentially impact tumor cell sensitivity to PCA062. The preclinical data presented here suggest that PCA062 may have clinical value for treating patients with multiple cancer types including basal-like breast cancer.
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Affiliation(s)
- Qing Sheng
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | | | - Daniel L Menezes
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Christopher Karim
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Yan Tang
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Angela Tam
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Suzanna Clark
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Chi Ying
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Anu Connor
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Keith G Mansfield
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | | | - Majid Ghoddusi
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Felipe C Geyer
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Jane Gu
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | | | - Rick Newcombe
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - GiNell Elliot
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | | | - Sylvie Lehmann
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Christie P Fanton
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Kathy Miller
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Thomas Huber
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | | | - Ursula Jeffry
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Nancy K Pryer
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Emma Lees
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Paul Kwon
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Judith A Abraham
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Jason S Damiano
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts
| | - Tinya J Abrams
- Novartis Institutes for Biomedical Research, Cambridge, Massachusetts.
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Costa AFO, Menezes DL, Pinheiro LHS, Sandes AF, Nunes MAP, Lyra Junior DP, Schimieguel DM. Role of new Immunophenotypic Markers on Prognostic and Overall Survival of Acute Myeloid Leukemia: a Systematic Review and Meta-Analysis. Sci Rep 2017; 7:4138. [PMID: 28646224 PMCID: PMC5482890 DOI: 10.1038/s41598-017-00816-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 02/15/2017] [Indexed: 12/30/2022] Open
Abstract
Despite technological advances, the prognosis and survival of acute myeloid leukemia (AML) adult patients remain low, compared with other hematologic malignancies. Some antigens detected by immunophenotyping may soon play a significant role in the pathophysiologic, prognostic, and overall survival (OS) rate of AML patients. Therefore, we conducted a systematic review and meta-analysis of PubMed, Scopus, Science Direct, Web of Science, and the Cochrane Library (using PRISMA guidelines). We analyzed 11 studies and 13 antigens, detected through the immunophenotyping of 639 patients. From them, twelve exhibited a negative impact with AML prognosis. The meta-analysis demonstrated a high expression of AML markers, which have been associated with a decrease in survival over 10 months (RR 2.55; IC 95%; 1.49-4.37) and over 20 months (RR 2.46; IC 95%; 1.75-3.45). Knowing that the expression of immunophenotypic markers, which are not used on a routine basis, might be able to influence disease behavior, looks promising. However, they have been associated with a poor prognosis as well as a decrease in survival. This may allow for different chemotherapeutical protocols, including future studies for new therapeutic targets.
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Affiliation(s)
- A F O Costa
- Department of Pharmacy, Laboratory of Hematology, Federal University of Sergipe, Aracaju, Sergipe, Brazil.
| | - D L Menezes
- Department of Pharmacy, Laboratory of Hematology, Federal University of Sergipe, Aracaju, Sergipe, Brazil
| | - L H S Pinheiro
- Department of Pharmacy, Laboratory of Hematology, Federal University of Sergipe, Aracaju, Sergipe, Brazil
| | - A F Sandes
- Fleury Group, Hematology Division, São Paulo, São Paulo, Brazil
| | - M A P Nunes
- Department of Medicine, Federal University of Sergipe, Aracaju, Sergipe, Brazil
| | - D P Lyra Junior
- Department of Pharmacy, Laboratory of Hematology, Federal University of Sergipe, Aracaju, Sergipe, Brazil
| | - D M Schimieguel
- Department of Pharmacy, Laboratory of Hematology, Federal University of Sergipe, Aracaju, Sergipe, Brazil
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Han W, Menezes DL, Xu Y, Knapp MS, Elling R, Burger MT, Ni ZJ, Smith A, Lan J, Williams TE, Verhagen J, Huh K, Merritt H, Chan J, Kaufman S, Voliva CF, Pecchi S. Discovery of imidazo[1,2-a]-pyridine inhibitors of pan-PI3 kinases that are efficacious in a mouse xenograft model. Bioorg Med Chem Lett 2016; 26:742-746. [PMID: 26774655 DOI: 10.1016/j.bmcl.2016.01.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 12/25/2015] [Accepted: 01/04/2016] [Indexed: 10/22/2022]
Abstract
Alterations in PI3K/AKT signaling are known to be implicated with tumorigenesis. The PI3 kinases family of lipid kinases has been an attractive therapeutic target for cancer treatment. Imidazopyridine compound 1, a potent, selective, and orally available pan-PI3K inhibitor, identified by scaffold morphing of a benzothiazole hit, was further optimized in order to achieve efficacy in a PTEN-deleted A2780 ovarian cancer mouse xenograft model. With a hypothesis that a planar conformation between the core and the 6-heteroaryl ring will allow for the accommodation of larger 5'-substituents in a hydrophobic area under P-loop, SAR efforts focused on 5'-alkoxy heteroaryl rings at the 6-position of imidazopyridine and imidazopyridazine cores that have the same dihedral angle of zero degrees. 6'-Alkoxy 5'-aminopyrazines in the imidazopyridine series were identified as the most potent compounds in the A2780 cell line. Compound 14 with 1,1,1-trifluoroisopropoxy group at 6'-position demonstrated excellent potency and selectivity, good oral exposure in rats and in vivo efficacy in A2780 tumor-bearing mouse. Also, we disclose the X-ray co-crystal structure of one enantiomer of compound 14 in PI3Kα, confirming that the trifluoromethyl group fits nicely in the hydrophobic hot spot under P-loop.
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Affiliation(s)
- Wooseok Han
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Daniel L Menezes
- Oncology, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Yongjin Xu
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Mark S Knapp
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Robert Elling
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Matthew T Burger
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Zhi-Jie Ni
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Aaron Smith
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Jiong Lan
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Teresa E Williams
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Joelle Verhagen
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Kay Huh
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Hanne Merritt
- Oncology, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - John Chan
- Oncology, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Susan Kaufman
- Oncology, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Charles F Voliva
- Oncology, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
| | - Sabina Pecchi
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, 5300 Chiron Way, Emeryville, CA 94608, United States
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Menezes DL, Holt J, Tang Y, Feng J, Barsanti P, Pan Y, Ghoddusi M, Zhang W, Thomas G, Holash J, Lees E, Taricani L. A Synthetic Lethal Screen Reveals Enhanced Sensitivity to ATR Inhibitor Treatment in Mantle Cell Lymphoma with ATM Loss-of-Function. Mol Cancer Res 2014; 13:120-9. [DOI: 10.1158/1541-7786.mcr-14-0240] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Menezes DL, Taverna P, Jensen MR, Abrams T, Stuart D, Yu GK, Duhl D, Machajewski T, Sellers WR, Pryer NK, Gao Z. The novel oral Hsp90 inhibitor NVP-HSP990 exhibits potent and broad-spectrum antitumor activities in vitro and in vivo. Mol Cancer Ther 2012; 11:730-9. [PMID: 22246440 DOI: 10.1158/1535-7163.mct-11-0667] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A novel oral Hsp90 inhibitor, NVP-HSP990, has been developed and characterized in vitro and in vivo. In vitro, NVP-HSP990 exhibits single digit nanomolar IC(50) values on three of the Hsp90 isoforms (Hsp90α, Hsp90β, and GRP94) and 320 nanomolar IC(50) value on the fourth (TRAP-1), with selectivity against unrelated enzymes, receptors, and kinases. In c-Met amplified GTL-16 gastric tumor cells, NVP-HSP990 dissociated the Hsp90-p23 complex, depleted client protein c-Met, and induced Hsp70. NVP-HSP990 potently inhibited the growth of human cell lines and primary patient samples from a variety of tumor types. In vivo, NVP-HSP990 exhibits drug-like pharmaceutical and pharmacologic properties with high oral bioavailability. In the GTL-16 xenograft model, a single oral administration of 15 mg/kg of NVP-HSP990 induced sustained downregulation of c-Met and upregulation of Hsp70. In repeat dosing studies, NVP-HSP990 treatment resulted in tumor growth inhibition of GTL-16 and other human tumor xenograft models driven by well-defined oncogenic Hsp90 client proteins. On the basis of its pharmacologic profile and broad-spectrum antitumor activities, clinical trials have been initiated to evaluate NVP-HSP990 in advanced solid tumors.
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Affiliation(s)
- Daniel L Menezes
- Novartis Institutes for Biomedical Research, 4560 Horton Street, Emeryville, CA 94608, USA
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