Application submitted for salt change generic to 'Jakavi'

First application for generic has been submitted last month…if composition patent is circumvented, generics can be launched after January 2027

Post-Marketing Surveillance (PMS) for the Graft-versus-Host Disease (GVHD) indication continues until May of next year, applications are not accepted during this period

Novartis' rare blood cancer treatment 'Jakavi'

The first applications for a generic to Novartis's 'Jakavi (ruxolitinib phosphate)', used for rare blood cancers, have been filed in South Korea. Jakavi is facing generic competition ahead of the expiration of its domestic substance patent on January 14, 2027. Currently, Daewoong Pharmaceutical and Chong Kun Dang are actively seeking to circumvent a composition patent.

According to the Ministry of Food and Drug Safety (MFDS), applications for different dosage variants of a salt form-changed generic to Jakavi were filed on the 24th and 27th of last month. In response, the MFDS notified the original patent holder, who had registered patents on the drug listing, of the generic applications, in accordance with the Patent-Approval Linkage System.

The generic drug has a different salt form from the original Jakavi. While Jakavi is the phosphate salt, the generic drug uses the hemifumarate salt. This change in salt form is interpreted as a strategy to circumvent the patent.

Currently, Daewoong Pharmaceutical and Chong Kun Dang are also working to circumvent the composition patent by filing suits for negative confirmation of the scope of right with the Korean Intellectual Property Trial and Appeal Board. If these suits are successful, they will be able to launch their generic drugs immediately after the substance patent expires on January 14, 2027.

Another key characteristic of the generic drug applications is that they exclude the Graft-versus-Host Disease (GVHD) indication, which still has a remaining Post-Marketing Surveillance (PMS) period.

Jakavi is indicated for the treatment for Myelofibrosis (MF), Polycythemia Vera (PV), and Graft-versus-Host Disease (GVHD). However, the GVHD indication was added in 2022 and has a remaining PMS period until May of next year (2026). During the PMS period, the filing of generic drug applications is generally prohibited.

Generics to Jakavi are reportedly under development, besides those form Daewoong and Chong Kun Dang. Jakavi is a global blockbuster product, with worldwide sales reaching KRW 6.6 trillion as of 2024. Its sales in South Korea are rapidly rising after successfully securing reimbursement coverage for MF and subsequently for GVHD in 2023.

Given that rare disease drugs often lack alternatives and carry high costs, analysis suggests that companies succeeding in an early launch of a generic drug can secure a stable sales performance.