Abstract
Pranlukast hydrate (Onon) was the world’s first cysteinyl leukotriene (CysLT) receptor antagonist and was developed by Ono Pharmaceutical. The innovation of pranlukast is summarized by its provision of an oral agent with high efficacy against bronchial asthma, and its novel mechanism of action. The case of pranlukast development has the following implications. The first is the importance of the contribution of the underlying scientific knowledge to the development of a drug with a novel mechanism of action, particularly at the conceptualization stage of the project. In the case of pranlukast, the discovery of leukotrienes was the contributing factor. The second is the importance of accumulating drug development experience. Such development of expertise allowed Ono Pharmaceutical to discover such a promising compound ahead of other companies located around the globe that were also in competition to develop an LT antagonist. Pranlukast was the first antagonist of CysLT receptors to be developed and became a highly successful drug in Japan with annual sales of tens of billions of yen. However, the third LT antagonist, montelukast (Singulair), has recorded far greater sales than pranlukast globally. These facts provide two additional insights into a market competition of the pharmaceutical industry. The first is related to patent protection and the subsequent entries into the market. The second is the importance of complementary assets in market competition.
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- 1.
Leukotrienes include LTA4 (leukotriene A4), LTB4, LTC4, LTD4, LTE4, and LTF4. Among them, LTC4, LTD4, LTE4 are called cysteinyl leukotrienes (CysLTs) because they have cysteine residues in their structures (Kanaoka 2011).
- 2.
Pharmaceutical Interview Form: Onon Capsules 112.5 mg (revised December 2011, 8th edn), p. 1, 62.
- 3.
Pharmaceutical Interview Form: Onon Dry Syrup 10% (revised January 2012, 8th edn), p. 1, 70.
- 4.
Pharmaceutical Interview Form: Onon Capsules 112.5 mg (revised December 2011, 8th edn), p. 1.
- 5.
Ono Pharmaceutical “Supplementary Explanation Materials for Financial Results (Fiscal Year 2007, Consolidated and Non-consolidated).”
- 6.
“The total number of patients” in the survey refers to those who were continually receiving medical care at the date of the survey, including those who had not received medical treatment at a medical facility at the date of the survey.
- 7.
The prevalence rate is the ratio of those who responded “with asthma symptoms within the past 12 months” in the questionnaire.
- 8.
WHO Fact sheet on asthma, http://www.who.int/en/news-room/fact-sheets/detail/asthma, (accessed 31 July 2018).
- 9.
Pharmaceutical Interview Form: Onon Capsules 112.5 mg (revised December 2011, 8th edn), p. 18.
- 10.
- 11.
- 12.
Kurzrok and Lieb speculated that the seminal fluid contained acetylcholine, which was already known to cause contractions of the myometrium and did not indicate the presence of a new agent. Therefore, the honor of the discovery of prostaglandin does not belong to them.
- 13.
Nikkei Daily Morning Edition, 7 February 1984, p. 14.
- 14.
- 15.
AA-861, discovered by Takeda Pharmaceutical, was one of the biosynthetic inhibitors that emerged early in the development competition. However, it was not commercialized because of poor pharmacokinetics in humans. In the United States, a 5-lipoxygenase inhibitor zileuton (Zyflo) was commercialized in 1997. Zileuton is hepatotoxic and requires periodic liver function tests (Abiru 2001).
- 16.
- 17.
RS-001 was the compound whose antagonistic activity was found by random screening, and ONO-1078 (pranlukast) was synthesized and developed from the same compound. Note that “RS” of RS-001 came from random screening.
- 18.
Pharmaceutical Interview Form: Onon Capsules 112.5 mg (revised December 2011, 8th edn), p. 1.
- 19.
Nikkei Daily Morning Edition, 29 September 1984, p. 16.
- 20.
The Compiled Works of E. J. Corey, http://www.ejcorey.org/corey/publications/publications.php, (accessed 24 February 2014).
- 21.
Pharmaceutical Interview Form: Azeptin Tablets 0.5 mg, Azeptin Tablets 1 mg, Azeptin Granules 0.2% (revised February 2012, 8th edn), p. 10.
- 22.
Pharmaceutical Interview Form: Vega Tablets 100 mg/200 mg (revised January 2010, 3rd edn), p. 9.
- 23.
Pharmaceutical Interview Form: Domenan Tablets 100 mg, Domenan Tablets 200 mg (revised April 2011, 3rd edn), p. 8.
- 24.
Pharmaceutical Interview Form: Onon Capsules 112.5 mg (revised December 2011, 8th edn), p. 11.
- 25.
Ono Pharmaceutical “Notice of Amendment to Forecast of Full-Term Results for the Year Ended March 31, 2008”, 8 November 2007.
- 26.
Upjohn was a company that had been engaged in research since the beginning in the PG field. This may been because of the tight connection between Bergström, who accomplished isolation and identification of PGs, and the company. For such fundamental work, various boosts, including funds were indispensable, and the very person who took care of this was Dr. Weisblatt of Upjohn, an old friend of Bergström (Sakamoto and Sato 1983, p. 4).
- 27.
In the interview, it was speculated that Merck’s clinical development slowed down, because of some trouble with the clinical compound under development, forcing the company to change to montelukast.
- 28.
Pharmaceutical Interview Form: Singulair Tablets 5 mg, Singulair Tablets 10 mg, Singulair Tablets 5 mg, Singulair Fine Granules 4 mg (revised in April 2014, 29th edn), p. 1, 68.
- 29.
Pharmaceutical Interview Form: Acolate Tablets 20 mg (revised in November 2011, 8th edn), p. 1.
- 30.
Corporate financial data were obtained from Nikkei NEEDS-FinancialQUEST.
- 31.
Nikkei Business Daily, 1 April 1993, p. 15.
- 32.
IMS R&D Focus Drug News, 17 May 1999.
- 33.
Nikkei Business Daily, 8 November 2000, p. 10.
- 34.
Nikkei Business Daily, 28 August 2002, p. 11.
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Nakamura, K. (2019). Pranlukast (Onon). In: Nagaoka, S. (eds) Drug Discovery in Japan. Springer, Singapore. https://doi.org/10.1007/978-981-13-8906-1_8
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