Pixantrone

BBR-2778 , CTK0H5262

• Pixolti
• Pixuvri
• UNII-P0R64C4CR9

An immunosuppressant.

144510-96-3 [RN]

5,8-Bis((2-aminoethyl)amino)-2-aza-anthracene-9,10-dione

6,9-Bis((2-aminoethyl)amino)benz(g)isoquinoline-5,10-dione

5,8-Bis((2-aminoethyl)amino)-2-aza-anthracene-9,10-dione

6,9-Bis((2-aminoethyl)amino)benz(g)isoquinoline-5,10-dione

CTI BioPharma receives Israeli approval for aggressive B-cell non-Hodgkin’s lymphoma therapy

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Pixantrone
IUPAC name 6,9-bis[(2-aminoethyl)amino]benzo[g]isoquinoline-5,10-dione
Identifiers
CAS number	144510-96-3
PubChem	134019
ChemSpider	118174
KEGG	D05522
ChEMBL	CHEMBL167731
ATC code	L01DB11
Jmol-3D images	Image 1
SMILES [show]
InChI [show]
Properties
Molecular formula	C17H19N5O2
Molar mass	325.365 g/mol
Appearance	Blue solid
Pharmacology
Routes of administration	Intravenous
Elimination half-life	9.5–17.5 hours
Excretion	Fecal (main route of excretion) and renal (4–9%)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)

Pixantrone dimaleate [USAN]

CAS  144675-97-8

Molecular Formula

On May 10, 2012, the European Commission issued a conditional marketing authorization valid throughout the European Union for pixantrone for the treatment of adult patients with multiply relapsed or refractory aggressive non-Hodgkin’s B-cell lymphoma (NHL). Pixantrone is a cytotoxic aza-anthracenedione that directly alkylates DNA-forming stable DNA adducts and cross-strand breaks. The recommended dose of pixantrone is 50 mg/m² administered on days 1, 8, and 15 of each 28-day cycle for up to 6 cycles. In the main study submitted for this application, a significant difference in response rate (proportion of complete responses and unconfirmed complete responses) was observed in favor of pixantrone (20.0% vs. 5.7% for pixantrone and physician’s best choice, respectively), supported by the results of secondary endpoints of median progression-free and overall survival times (increase of 2.7 and 2.6 months, respectively). The most common side effects with pixantrone were bone marrow suppression (particularly of the neutrophil lineage) nausea, vomiting, and asthenia. This article summarizes the scientific review of the application leading to approval in the European Union. The detailed scientific assessment report and product information, including the summary of product characteristics, are available on the European Medicines Agency website (http://www.ema.europa.eu).

Pixantrone (rINN; trade name Pixuvri) is an experimental antineoplastic (anti-cancer) drug, an analogue of mitoxantrone with fewertoxic effects on cardiac tissue.^[1] It acts as a topoisomerase II poison and intercalating agent.^[2][3] The code name BBR 2778 refers topixantrone dimaleate, the actual substance commonly used in clinical trials.^[4]

History

Anthracyclines are important chemotherapy agents. However, their use is associated with irreversible and cumulative heart damage. Investigators have attempted to design related drugs that maintain the biological activity, but do not possess the cardiotoxicity of the anthracyclines.^[5] Pixantrone was developed to reduce heart damage related to treatment while retaining efficacy.^[1]

Random screening at the US National Cancer Institute of a vast number of compounds provided by the Allied Chemical Company led to the discovery of ametantrone as having significant anti-tumor activity. Further investigation regarding the rational development of analogs of ametantrone led to the synthesis of mitoxantrone, which also exhibited marked anti-tumor activity^[5] Mitoxantrone was considered as an analog of doxorubicin with less structural complexity but with a similar mode of action. In clinical studies, mitoxantrone was shown to be effective against numerous types of tumors with less toxic side effects than those resulting from doxorubicin therapy. However, mitoxantrone was not totally free of cardiotoxicity. A number of structurally modified analogs of mitoxantrone were synthesized and structure-activity relationship studies made.^[5] BBR 2778 was originally synthesized by University of Vermont researchers Miles P. Hacker and Paul A. Krapcho^[5] and initially characterized in vitro for tumor cell cytotoxicity and mechanism of action by studies at the Boehringer Mannheim Italia Research Center, Monza, and University of Vermont, Burlington.^[4]Other studies have been completed at the University of Texas M. D. Anderson Cancer Center, Houston, the Istituto Nazionale Tumori,Milan, and the University of Padua.^[2][6][4] In the search for novel heteroanalogs of anthracenediones, it was selected as the most promising compound. Toxicological studies indicated that BBR 2778 was not cardiotoxic, and US patents are held by the University of Vermont. An additional US patent application was completed in June 1995 by Boehringer Mannheim, Italy.^[5]

Novuspharma, an Italian company, was established in 1998 following the merger of Boehringer Mannheim and Hoffmann-La Roche, and BBR 2778 was developed as Novuspharma’s leading anti-cancer drug, pixantrone.^[7] A patent application for the injectable preparation was filed in May 2003.^[8]

In 2003, Cell Therapeutics, a Seattle biotechnology company, acquired pixantrone through a merger with Novuspharma.^[9]

Clinical trials

Pixantrone is a substance that is being studied in the treatment of cancer. It belongs to the family of drugs called antitumor antibiotics.^[10] phase III clinical trials of pixantrone have been completed.^[11][12] Pixantrone is being studied as an antineoplastic for different kinds of cancer, including solid tumors and hematological malignancies such as non-Hodgkin lymphomas.

Animal studies demonstrated that pixantrone does not worsen pre-existing heart muscle damage, suggesting that pixantrone may be useful in patients pretreated with anthracyclines. While only minimal cardiac changes are observed in mice given repeated cycles of pixantrone, 2 cycles of traditional anthracyclines doxorubicin or mitoxantrone result in marked or severe heart muscle degeneragion.^[1]

Clinical trials substituting pixantrone for doxorubicin in standard first-line treatment of patients with aggressive non-Hodgkin’s lymphoma, had a reduction in severe side effects when compared to patients treated with standard doxorubicin-based therapy. Despite pixantrone patients receiving more treatment cycles, a three-fold reduction in the incidence of severe heart damage was seen as well as clinically significant reductions in infections and thrombocytopenia, and a significant reduction in febrile neutropenia. These findings could have major implications for treating patients with breast cancer, lymphoma, and leukemia, where debilitating cardiac damage from doxorubicin might be prevented.^[13]Previous treatment options for multiply relapsed aggressive non-Hodgkin lymphoma had disappointing response rates.^[14]

The completed phase II RAPID trial compared the CHOP-R regimen of Cyclophosphamide, Doxorubicin, Vincristine, Prednisone, and Rituximab to the same regimen, but substituting Doxorubicin with Pixantrone. The objective was to show that Pixantrone was not inferior to Doxorubicin and less toxic to the heart.^[15]

Pixantrone was shown to have potentially reduced cardiotoxicity and demonstrated promising clinical activity in these phase II studies in heavily pretreated non-Hodgkin lymphomapatients.^[14]

The pivotal phase III EXTEND (PIX301) randomized clinical trial studied pixantrone to see how well it works compared to other chemotherapy drugs in treating patients with relapsed non-Hodgkin’s lymphoma.^[16] The complete response rate in patients treated with pixantrone has been significantly higher than in those receiving other chemotherapeutic agents for treatment of relapsed/refractory aggressive non-Hodgkin lymphoma.^[14]

Administration

It can be administered through a peripheral vein rather than a central implanted catheter as required for other similar drugs.^[8][14]

Regulatory approval

U.S. Food and Drug Administration

The FDA granted fast track designation for pixantrone in patients who had previously been treated two or more times for relapsed or refractory aggressive NHL. Study sponsor Cell Therapeutics announced that Pixantrone achieved the primary efficacy endpoint. The minutes of the Oncologic Drugs Advisory Committee meeting of March 22, 2010^[17]show that this had not in fact been achieved with statistical significance and this combined with major safety concerns lead to the conclusion that the trial was not sufficient to support approval. In April 2010 the FDA asked for an additional trial.^[18]

European Medicines Agency

On May 5, 2009, Pixantrone became available in Europe on a Named-Patient Basis. A named-patient program is a compassionate use drug supply program under which physicians can legally supply investigational drugs to qualifying patients. Under a named-patient program, investigational drugs can be administered to patients who are suffering from serious illnesses prior to the drug being approved by the European Medicines Evaluation Agency. “Named-patient” distribution refers to the distribution or sale of a product to a specific healthcare professional for the treatment of an individual patient. In Europe, under the named-patient program the drug is most often purchased through the national health system.^[19] In 2012 pixantrone received conditional marketing authorization in the European Union as Monotherapy to Treat Adult Patients with Multiply Relapsed or Refractory Aggressive Non-Hodgkin B-Cell Lymphomas.

Research

Pixantrone is as potent as mitoxantrone in animal models of multiple sclerosis.^[20] Pixantrone has a similar mechanism of action as mitoxantrone on the effector function of lymphomonocyte B and T cells in experimental allergic encephalomyelitis but with lower cardiotoxicity. Pixantrone inhibits antigen specific and mitogen induced lymphomononuclear cell proliferation, as well as IFN-gamma production.^[21] Clinical trials are currently ongoing in Europe.

Pixantrone also reduces the severity of experimental autoimmune myasthenia gravis in Lewis rats,^[22] and in vitro cell viability experiments indicated that Pixantrone significantly reduces amyloid beta (A beta(1-42)) neurotoxicity, a mechanism implicated in Alzheimer’s disease.^[23]

http://www.chemdrug.com/databases/8_0_mhpyqlxgrykqdwig.html

3,4-Pyridinedicarboxylic acid (I) was converted to the cyclic anhydride (II) upon heating with acetic anhydride. Friedel-Crafts condensation of anhydride (II) with p-difluorobenzene (III) in the presence of AlCl3 gave rise to a mixture of two regioisomeric keto acids, (IV) and (V). Cyclization of this mixture in fuming sulfuric acid at 140 C generated the benzoisoquinoline (VI) (1,2). Subsequent displacement of the fluorine atoms of (VI) with ethylenediamine ( VII) in pyridine provided the target bis (2-aminoethylamino) derivative, which was finally converted to the stable dimaleate salt. Alternatively, ethylenediamine (VII) was protected as the mono-N-Boc derivative (VIII) by treatment with Boc2O. Condensation of the difluoro compound (VI) with the protected ethylenediamine (VIII) furnished (IX). The Boc groups of (IX) were then removed by treatment with trifluoroacetic acid. After adjustment of the pH to 4.2 with KOH, treatment with maleic acid provided BBR-2778.

J Med Chem1994,37, (6): 828

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References