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BIOLOGICAL AGENTS AS DRUGS
Najmdin Hasan
Jwan M. AhmedHamid S. Alghurabi
Sahar KarimzadehnaminiMohammad H. Alyami
Introduction
• A substance produced from a living organisms or it is derivatives.
• Biological agents/drugs include antibodies, interleukins, and vaccines.
It is used clinically for: Prevention Diagnosis Treatment of diseases (cancer diseases) Control or decrease side effects from other cancer therapies such as chemotherapy , like Neupogen (increase WBCs )Erythropoietin (helps make RBCs)Interleukin-II ( helps make Platelets)
Biological therapy
• New method for cancer treatment.• Biological therapy helps immune system to
fight cancer. • chemotherapy attack cancer cells directly.• biological response modifiers therapy
BRMs(boost, direct, and strengthen the weakened immune).
Edward Jenner (1749-1823) William Coley (1862-1936)
Paul Ehrlich (1854-1915)
Less than 30 years ago, FDA recognised the use of interferon in the treatment of hairy-cell leukaemia.In(1992)IL-2 , and in (1994) IL-12 they were approved by FDA to treat kidney cancer and metastatic cancer, respectively.
Inject human with fluid taken from cow with cowpox, vaccinia.
New York surgeon. Started using biological therapy for cancer treatment.
German Nobel Prize winner in 1908.
General information
• There two types of body defence system. 1. Physical barrier (the skin, mucous
membranes, the lining of the respiratory tract)
2. Immune system ; works by finding the foreign organisms or cells and kill, destroy or deactivate them by specific process.
Immune System Cells• Lymphocytes (WBCs) major immune cells: T-cells, B-cells, and NK cells.T-cells directly attack infected, foreign, or cancerous
cells. B-cells secrete antibodies, the proteins that
recognize and attach to foreign substances known as antigens.
Natural Killer cells produce powerful chemical substances that bind to and kill any foreign invader.
Types of Biological drugs
• Monoclonal antibody• Interleukins
• Interferon
• Protein kinase inhibitors
• Hematopoietic Growth factors – GM-CSF eg. Sargaromostim (Leukine® by Immunex)– G-CSF eg. Filgrastim (Neupogen® by Amgen)
• Retinoid (vitamin A)
• Fusion proteins http://www.vettherapeutics.com/
• Immunoglobulin, hormones,
enzymes and growth factors.
• Cytokine antagonists (anti
inflammatory)
• Vaccines– traditional vaccines– cancer vaccines
• To prevent cancer eg.HPV vaccine• To help treat cancer eg. Sipuleucel-T
(Provenge®)http://www.smi-online.co.uk/pharmaceuticals/uk/cancer-vaccines?utm_source=P-042&utm_medium=BenthamScience&utm_campaign=WebBanner
Types of Biological drugs
Monoclonal antibody
Single type of antibody, eg.
Avastin®
• Unconjugated antibodies
• Conjugated antibody
• Radioimmunotherapy– Carrier for β-emitting isotope
http://www.lonza.com/custom-manufacturing/chemical-manufacturing/antibody-drug-conjugates-adcs.aspxhttp://www.nucmedconsultants.com/tutorials/rit-nhl/zevalin2.htm
Protein kinase inhibitors
Cancer growth blockers, eg. Pazopanib®
Types are:• Tyrosine kinase inhibitors• Proteasome inhibitors• mTOR inhibitors• PI3K inhibitors• Histone deacetylase inhibitors• Hedgehog pathway blokershttp://www.cancer.gov/cancertopics/understandingcancer/targetedtherapies/htmlcourse/page3
Interferons• Interferon-α
– Rofeon-A® by Roch Lab, Wellferon® by Glaxo Wellcome Inc
• Interferon-β– Betaseron® by Berlex
Laboratories.
• Interferon-ɤ– Actimmune® by InterMune
Pharmaceuticals Inc.
http://srxawordonhealth.com/category/hepatitis-c/http://blog.lef.org/2012/01/hormones-that-boost-immune-system.html
Bevacizumab• Bevacizumab (avastin®) is a drug made by
company Genentech.• It and was approved by the FDA for the
treatment of:
Metastatic Colorectal Cancer (2004) Non-Small Cell Lung Cancer (2006)Glioblastoma (2009)Metastatic Renal Cell Carcinoma (2009)Metastatic HER2-negative breast cancer (2008).
http://cvs.com/search/_/N-3nZ2i?searchTerm=protein+supplements&pt=drug&navNum=40http://www.avastin.com/hcp/crc/index.htmlhttp://www.avastin.com/hcp/lung/index.htmlhttp://www.avastin.com/hcp/gbm/index.htmlhttp://www.avastin.com/hcp/kidney/index.html
Production• It is humanized recombinant monoclonal
antibody
http://cmr.asm.org/content/17/4/926/F1.expansion.html (amended)
Mechanism of action
http://www.angioworld.com/DominiqueGarrel.html (amended)
http://www.wjgnet.com/2218-4333/full/v2/i2/WJCO-2-125-g013.htm
Clinical Studies
http://www.avastin.com/hcp/crc/efficacy/overview/index.html
Established efficacy of Avastin plus IFL in MCRC
Advantages
• Broad Spectrum• Long half-life• Relatively less side effects & Toxicity
Limitations
• Resistance• Long treatment• Adverse effects and Complications
Current State
• Still under clinical investigation• Eye diseases• Ovarian Cancer• Pediatric Osteosarcoma
Pazopanib (Votreint)•Drug Properties:
-A second-generation multitargeted tyrosin kinase inhibitor (RTKs):- Indazolylpyrimidine
*Vascular endothelial growth factor receptor (VEGFR)-1,-2 and -3*Platelet-derived growth factor receptor (PDGFR) , β 𝛂*C-Kit tyrosine kinase
- Excellent antiangiogenic, antitumour activity-Synergism with chemotherapeutic drugs•
•
- Renal cell carcinoma (RCC)- Immunotherapy until 2005, 6 new treatment; 3 kinase inhibitors: Sorafenib, Sunitinib and Pazopanib*2009 by FDA *June 2010 by EMA (European
Medicines Agency)
Adopted from: Jie, J.L., Douglas, S.J.,(2010) Modern Drug Synthesis
Advanced soft tissue sarcoma*April 2012 by FDA
-Phase II or III for:Breast, lung, cervical, liver, thyroid prostate and colorectal cancer
http://www.charonboat.com/2009/02/charonboat_dot_com_sarcoma1.jpg
(Adopted from: Li, Y., et al., 2011)-Synergistic efficacy with docetaxel in D-resistance bladder cancer cells.
Rational for targeting VEGF and PDGF in RCC:
• Proliferation and survival cancer cells• of cancer cellsLoss of function of the von
Hippel-Lindau tumour gene• Accumulation of hypoxia-inducible
factor(HIF)• Upregulation of VEGF and PDGF
Mechanism of Action
Sunitinib, Sorafenib and Pazopanib also target other RTKs that may be important for their therapeutic effects
Preclinical Activity• Orally administered, 800 mg per day• In vitro inhibitory concentration (IC50) of 10, 30 and 47nm(VEGFR-1,-2,-
3 respectively) • In vitro inhibited with an IC50 of 7 nm treatment of HUVEC, Selectively
inhibited VEGF-induced proliferation of HUVEC IC50=21 nm• Greater than 1400-fold selective activity against tumour cells• Greater than 48-fold against fibroblasts• Anti tumour efficacy:Prostate, colon, lung, melanoma, head and neck• Excellent in vivo inhibition in mice with Matrigel plug and corneal
micropocket assays• Good oral exposure in both mice and dog and 49% oral bioavailabilty in
dogs
Clinical trial
• Phase I: Dose-escalation study, 56 patients enrolled in VEG10003 (50mg 3 times a week t0 2000 mg daily)
• Phase II: Randomized discontinuation design trial, 160 to 230 patients VEG102616
• Phase III: Randomized, placebo-controlled, multicancer, international trial, 350 patients ( advanced RCC), 800 mg once daily or placebo.
Clinical data (Safety and efficacy)
• Randomized, double-blind, placebo-controlled trial• 435 patients who recieved either no prior or one prior
cytokine-besed systemic therapy• All patients had clear cell histology(90%) or
predominantly clear-cell histology(10%) and similar porportions had prior nephrectomy
• Randomized to recieve Placebo or Propanotib• Primary end point: Progression free-survival(PFS)• Median PFS Pazopanib 9.2 month• placebo group 4.2 month
Side effects
• Different toxicity profile :• decrease in the overall frequency of chronic
fatigue, cardiac disease• Increasing the frequency of hepatic toxicity
and hypertension • Cardiovascular side effects
Biologics VS Chemotherapy
• Chemistry.• Mode of action.• Metabolism.• Adverse effects• Route of administration.• Cost
Chemistry
BIOLOGICS
CONVENTIONAL AGENT
• Large molecule(MW >> 1 kDa)
• Genetic technique
• Heat sensitive
• Heterogeneous
• Small molecule (MW < 1 kDa)
• Synthetized chemicals
• Stable
• Homogeneous
Mode of action
BIOLOGICS
CONVENTIONAL AGENT
• Helps the immune system fight cancer.
• Non linear dose-response
• Biological effect
• Attacks the cancer cells directly.
• Linear dose–response
• Pharmacological effect
Metabolism
BIOLOGICS
CONVENTIONAL AGENT
• Cytochrome P450 Independent
• Catabolized to endogenous amino acids
• Most of them have a high half-life
• Cytochrome P450 involvement.
• Metabolized to active and inactive products
• Half-life vary, relatively lower half-life
Adverse effect
Classification of adverse effects of biological agents.
TYPE α Reactions related to cytokine and cytokine released syndrome.
TYPE β Reactions include both immediate and delayed hypersensitivity reactions.
TYPE γ Reactions are related to immune imbalance syndrome.
TYPE δ Cross-reactions related to the expression of the same antigen on different tissue.
TYPE ε Reactions are non-immunological side-effects (new and original unexpected functions of biological agent)
Adverse effects induced by Traditional agents
Type A Pharmacological activity of the drug
Type B Immune-mediated and are thus not predictable
Type C AND D Short and long term toxicities
Type E withdrawal of the drug
Adverse effect
Route of administration
BIOLOGICS
CONVENTIONAL AGENT
• Ineffective orally (made of protein)
• Some are effective orally (chemical compound)
Cost
BIOLOGICS
CONVENTIONAL AGENT
• Very Expensive (Produced by advanced Biotechnology)
• Relatively not expensive (prepared by chemical synthesis)
• Biological agents have a potential with a promising results (they are of high interest now especially in Oncology)
• Provide better response with fewer side effects (have an accurate targeting)
• Powerful Supplement with chemotherapy
Conclusion
• The cost is high (but it will be cheaper in the future when these drugs are produced in abundance)
• Currently, many of these drugs are produced and tested in clinical trials (but the problem is that they take years being tested in clinical trials to gain their approval by the FDA for different indications)
Conclusion
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