Abaloparatide

Abaloparatide (brand name Tymlos) is a parathyroid hormone-related protein (PTHrP) analog drug used to treat osteoporosis. Like the related drug teriparatide, and unlike bisphosphonates, it is an anabolic (i.e., bone growing) agent.[1]

Abaloparatide
Clinical data
Trade namesTymlos
Other namesBA058, BIM-44058
AHFS/Drugs.comMonograph
MedlinePlusa617038
Routes of
administration		Subcutaneous injection
ATC code
Legal status
Legal status
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEMBL
Chemical and physical data
FormulaC174H299N56O49
Molar mass3959.649 g·mol−1
3D model (JSmol)

In 2017, it was approved to treat postmenopausal osteoporosis in the United States.

Medical uses

Abaloparatide is indicated to treat postmenopausal women with osteoporosis who are at high risk of bone fractures.[2]

Side effects

The most common side effects reported by more than 2% of clinical trials subjects are hypercalciuria, dizziness, nausea, headache, palpitations, fatigue, upper abdominal pain and vertigo.[3]

Preclinical studies revealed that abaloparatide systemic daily administration leads to a dose- and time-dependent increase in the incidence of osteosarcoma in rodents.[4] However, whether abaloparatide-SC will cause osteosarcoma in humans is unknown. Thus, the use of abaloparatide is not recommended for individuals at increased risk of osteosarcoma. Additionally, its use is not advised for more than 2 years during a patient's lifetime.[3][5]

Pharmacology

Abaloparatide is 34 amino acid synthetic analog of PTHrP. It has 41% homology to parathyroid hormone (PTH) (1-34) and 76% homology to parathyroid hormone-related protein (PTHrP) (1-34).[6] It works as an anabolic agent for the bone, through selective activation of the parathyroid hormone 1 receptor (PTH1R), a G protein-coupled receptor (GPCR) expressed in the osteoblasts and osteocytes. Abaloparatide preferentially binds the RG conformational state of the PTH1R, which in turn elicits a transient downstream cyclic AMP signaling response towards to a more anabolic signaling pathway.[7][8]

History

Preclinical studies

Abaloropatide was known as BIM-44058 when it was first discovered at Ipsen and as BA058 while under development. The anabolic effects of abaloparatide on bone were demonstrated in two preclinical studies conducted in ovariectomized rats. Both studies showed increased cortical and trabecular bone volume and density, and trabecular microarchitecture improvement in vertebral and nonvertebral bones after short-term[9] and long-term[10] daily subcutaneous injection of abaloparatide compared to controls. Recent studies indicated a dose-dependent increased in bone mass and strength in long-term abalorapatide treatment.[11] However, it was also found that prolonged abalorapatide-SC treatment leads to increased incidence of osteosarcoma.[4] To date, there is no evidence for increased risk of bone tumors due to prolonged systemic administration in humans. Based on preclinical data, the FDA does not advised the use of abaloparatide-SC for more than 2 years, or in patients with history of Paget disease and/or other conditions that exacerbates the risk of developing osteosarcoma.[3]

Clinical Trials

Phase II trials were initiated in 2008. A 24-week randomized trial was conducted in postmenopausal women with osteoporosis (n=222) assessing bone mass density (BMD) changes as the primary endpoint.[12] Significant BMD increase at doses of 40 and 80 mcg were found in the lumbar spine, femur and hips of abaloparatide-treated participants compared to placebo. Additionally, abaloparatide showed superior anabolic effects on the hips compared to teriparatide.[13]

In the phase III (2011-2014) Abaloparatide Comparator Trial in Vertebral Endpoints (ACTIVE) trial, an 18-months randomized, multicenter, double-blinded, placebo-controlled study evaluated the long-term efficacy of abaloparatide compared to placebo and teriparatide in 2,463 postmenopausal women (± 69 years old).[14] Women who received daily injections of abaloparatide experienced substantial reduction in the incidence of fractures compared to placebo. Additionally, greater BMD increase at 6, 12 and 18 months in spinal, hips and femoral bones was observed in abaloparatide compared to placebo and teriparatide-treated subjects.[15]

Participants who completed 18 months of abaloparatide or placebo in the ACTIVE study were invited to participate in an extended open-labeled study - ACTIVExtend study (2012-2016).[16] Subjects (n=1139) received additional 2 years of 70 mg of alendronate, Vitamin D (400 to 800 IU), and calcium (500–1000 mg) supplementation daily. Combined abaloparatide and alendronate therapy reduced significantly the incidence of vertebral and nonvertebral fractures.[17]

A clinical trial assessing the effectiveness of abaloparatide in altering spinal bone mineral density (BMD) in male subjects is expected to start in the first quarter of 2018. If successful, Radius Health aims to submit a sNDA to expand the use of abaloparatide-SC to treat men with osteoporosis.[18]

In addition to the injectable form of abaloparatide, a transdermal patch is also in development.[1]

Commercialization

Abaloparatide-SC is manufactured by Radius Health, Inc. (RDUS), a biomedical company based in Waltham, Massachusetts. The firm reported that sales for abaloparatide were $3.5 million for the third quarter of 2017.[18] The company announced a net loss of $57.8 million, or $1.31 per share for the third quarter of 2017, compared to $19.2 million for the same quarter of 2016.[19] The net loss most likely reflects the substantial expenses associated with the preparation and launching of abaloparatide into the US market in May 2017.

In July 2017, Radius Health licensed rights to Teijin Limited for abaloparatide-SC manufacture and commercialization in Japan. Teijin is developing abaloparatide-SC under agreement with Ipsen Pharma S.A.S., and is conducting a phase III clinical trial in Japanese patients with osteoporosis.[20]

Regulatory Information

Radius Health filed a Marketing Authorization Application (MAA) in November 2015,[21] which was validated in December, 2015, and still under regulatory assessment by the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA). As in July 2017, the CHMP issued a second Day-180 List of Outstanding Issues, which Radius is addressing with the CHMP.[18]

In February 2016 a NDA was filed to the FDA, Radius NDA for abaloparatide-SC was accepted in May, 2016.[22] A Prescription Drug User Fee Act (PDUFA) date was initially granted on March 30, 2016, but then extended to June 30, 2017.[23] As previously stated, abaloparatide injection was approved for use in postmenopausal osteoporosis on April 28, 2017.[5]

Intellectual Property

Radius Health currently holds three patents on abaloparatide-SC, with expiration dates from 2027-2028.[24] The patents relate to the drug composition (US 8148333), and the drug delivery methods (US 7803770 B2 and US 8748382-B2).

Teijin was granted use of Radius Health's intellectual property in July 2017, for the development, manufacture and commercialization of abaloparatide-sc in Japan.

References
  1. Spreitzer H (18 January 2016). "Neue Wirkstoffe – Abaloparatid". Österreichische Apothekerzeitung (in German) (2/2016): 12.
  2. "Drug Trial Snapshot: Tymlos". U.S. Food and Drug Administration (FDA). 2019-02-09. This article incorporates text from this source, which is in the public domain.
  3. "Drugs@FDA: FDA Approved Drug Products". www.accessdata.fda.gov. Retrieved 2017-11-03.
  4. Jolette J, Attalla B, Varela A, Long GG, Mellal N, Trimm S, et al. (June 2017). "Comparing the incidence of bone tumors in rats chronically exposed to the selective PTH type 1 receptor agonist abaloparatide or PTH(1-34)". Regulatory Toxicology and Pharmacology. 86: 356–365. doi:10.1016/j.yrtph.2017.04.001. PMID 28389324.
  5. "FDA Approves Radius Health's TYMLOS (abaloparatide), a Bone Building Agent for the Treatment of Postmenopausal Women with Osteoporosis at High Risk for Fracture" (Press release). Radius Inc. 28 April 2017. Archived from the original on 2017-11-04. Retrieved 2017-11-03.
  6. Tella SH, Kommalapati A, Correa R (May 2017). "Profile of Abaloparatide and Its Potential in the Treatment of Postmenopausal Osteoporosis". Cureus. 9 (5): e1300. doi:10.7759/cureus.1300. PMC 5493470. PMID 28680788.
  7. Pioszak AA, Parker NR, Gardella TJ, Xu HE (October 2009). "Structural basis for parathyroid hormone-related protein binding to the parathyroid hormone receptor and design of conformation-selective peptides". The Journal of Biological Chemistry. 284 (41): 28382–91. doi:10.1074/jbc.M109.022905. PMC 2788887. PMID 19674967.
  8. Tay D, Cremers S, Bilezikian JP (February 2018). "Optimal dosing and delivery of parathyroid hormone and its analogues for osteoporosis and hypoparathyroidism - translating the pharmacology". British Journal of Clinical Pharmacology. 84 (2): 252–267. doi:10.1111/bcp.13455. PMC 5777439. PMID 29049872.
  9. Bahar H, Gallacher K, Downall J, Nelson CA, Shomali M, Hattersley G (November 2016). "Six Weeks of Daily Abaloparatide Treatment Increased Vertebral and Femoral Bone Mineral Density, Microarchitecture and Strength in Ovariectomized Osteopenic Rats". Calcified Tissue International. 99 (5): 489–499. doi:10.1007/s00223-016-0171-1. PMC 5055567. PMID 27395059.
  10. Varela A, Chouinard L, Lesage E, Smith SY, Hattersley G (January 2017). "One Year of Abaloparatide, a Selective Activator of the PTH1 Receptor, Increased Bone Formation and Bone Mass in Osteopenic Ovariectomized Rats Without Increasing Bone Resorption". Journal of Bone and Mineral Research. 32 (1): 24–33. doi:10.1002/jbmr.3003. PMID 27748532.
  11. Varela A, Chouinard L, Lesage E, Guldberg R, Smith SY, Kostenuik PJ, Hattersley G (February 2017). "One year of abaloparatide, a selective peptide activator of the PTH1 receptor, increased bone mass and strength in ovariectomized rats". Bone. 95: 143–150. doi:10.1016/j.bone.2016.11.027. PMID 27894941.
  12. Clinical trial number NCT00542425 for "Phase 2 Dose-finding Study to Evaluate the Effects of BA058 in the Treatment of Postmenopausal Women With Osteoporosis" at ClinicalTrials.gov
  13. Leder BZ, O'Dea LS, Zanchetta JR, Kumar P, Banks K, McKay K, et al. (February 2015). "Effects of abaloparatide, a human parathyroid hormone-related peptide analog, on bone mineral density in postmenopausal women with osteoporosis". The Journal of Clinical Endocrinology and Metabolism. 100 (2): 697–706. doi:10.1210/jc.2014-3718. PMID 25393645.
  14. Clinical trial number NCT01343004 for "Phase III Study to Evaluate the Safety and Efficacy of BA058 for Prevention of Fracture in Postmenopausal Women" at ClinicalTrials.gov
  15. Miller PD, Hattersley G, Riis BJ, Williams GC, Lau E, Russo LA, et al. (August 2016). "Effect of Abaloparatide vs Placebo on New Vertebral Fractures in Postmenopausal Women With Osteoporosis: A Randomized Clinical Trial". JAMA. 316 (7): 722–33. doi:10.1001/jama.2016.11136. PMID 27533157.
  16. Clinical trial number NCT01657162 for "Twenty Four Month Extension Study of BA058-05-003" at ClinicalTrials.gov
  17. Cosman F, Miller PD, Williams GC, Hattersley G, Hu MY, Valter I, et al. (February 2017). "Eighteen Months of Treatment With Subcutaneous Abaloparatide Followed by 6 Months of Treatment With Alendronate in Postmenopausal Women With Osteoporosis: Results of the ACTIVExtend Trial". Mayo Clinic Proceedings. 92 (2): 200–210. doi:10.1016/j.mayocp.2016.10.009. PMID 28160873.
  18. Inc., Radius Health. "Radius Health Reports Third Quarter 2017 Financial and Operating Results and Provides Business Update". GlobeNewswire News Room. Retrieved 2017-11-03.
  19. "Radius Health Reports Third Quarter 2017 Financial and Operating Results and Provides Business Update". Yahoo Finances (Press release). GlobeNewswire. 2 November 2017. Archived from the original on 2017-11-07. Retrieved 2017-11-03.
  20. "Radius Health Announces License and Development Agreement for Abaloparatide-SC with Teijin Limited in Japan" (Press release). Retrieved 2017-11-03.
  21. "Radius Health Has Submitted a Marketing Authorization Application for the Investigational Drug Abaloparatide-SC for the Treatment of Postmenopausal Osteoporosis in Europe" (Press release). Retrieved 2017-11-03.
  22. "Radius Announces FDA Acceptance for Filing of New Drug Application for Abaloparatide-SC for the Treatment of Postmenopausal Women with Osteoporosis" (Press release). Retrieved 2017-11-04.
  23. "NDA Approval Letter". FDA. Apr 27, 2017.
  24. "Abaloparatide | Patents | Expiry | Expiration | Dates |". PharmaCompass.com. Retrieved 2017-11-03.
  • "Abaloparatide". Drug Information Portal. U.S. National Library of Medicine.
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