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Other Disclosures4888STELLA PHARMA CORPORATIONPharmaceuticals

Announcement regarding the commencement of treatment at the Pengbo (Hainan) BNCT Center

BNCT treatment for head and neck cancer using the Company's boron drug Steboronin has commenced at the Pengbo (Hainan) BNCT Center in the Hainan Island Medical Special Zone, China. The first treatment was administered to 1 patient on each of 19 and 20 March 2026.

Worth reading
78Important
0–100. This measures how worthwhile something is to read, not how good or bad the company is.
Direction
Improvement
Direction inferred from the company’s description.
Scale
2
Patients (1 each on 19 and 20 March 2026)
Wording
Definitive
How definitive the wording is.

Announced details

SteboronineBNCT (boron neutron capture therapy)NeuCureNeuCure Dose Engine
Applicable field (uses covered by this announcement)

Unresectable, locally advanced or locally recurrent head and neck cancer. If a new indication is approved in Japan in the future, it may become eligible for treatment in the Hainan Island Medical Special Zone.

Launch date19 March 2026 (actual; first treatment for head and neck cancer), with treatment also administered to 1 patient on 20 March 2026. The Center opened on 7 February 2026 (actual).
Contract DateJune 2022 (basic agreement)
What the company reported numerically
Usage history

1 patient treated on each of 19 and 20 March 2026 (2 patients in total; actual results as of the commencement of treatment)

Relationship between the counterparty and the company
STELLA PHARMA CORPORATION4888
Relationship with the Company

The Company entered into a basic agreement with 中国生物科技服務控股有限公司 and Pengbo in June 2022 for the supply of Steboronin. The Company is working with SUMITOMO HEAVY INDUSTRIES,LTD. to combine its BNCT treatment system and dose calculation program with Steboronin and, in cooperation with Pengbo, develop BNCT services in the Hainan Island Medical Special Zone.

Counterparty中国生物科技服務控股有限公司 (Hong Kong Stock Exchange, Stock Code: 8037)鵬博(海南)硼中子医療科技有限公司 (Pengbo)SUMITOMO HEAVY INDUSTRIES,LTD.

SUMITOMO HEAVY INDUSTRIES,LTD. is headquartered in Shinagawa-ku, Tokyo. 中国生物科技服務控股有限公司 is listed on the Hong Kong Stock Exchange under Stock Code: 8037. Pengbo is a subsidiary of 中国生物科技服務控股有限公司. It obtained a license to engage in medical institution-related business in the Hainan Island Medical Special Zone and established and operates the Pengbo (Hainan) BNCT Center. Other details: Not disclosed.

Location (as indicated in this announcement)

Boao Lecheng International Medical Tourism Pilot Zone, Hainan, China

Impact on Business Performance

The impact on results for the fiscal year ending March 2026 is immaterial.

The company does not address Contract Value / Offering price.

Announced details
ItemDetails
Names of Products / Services CoveredSteboronine, BNCT (boron neutron capture therapy), NeuCure, NeuCure Dose Engine
Counterparty中国生物科技服務控股有限公司 (Hong Kong Stock Exchange, Stock Code: 8037), 鵬博(海南)硼中子医療科技有限公司 (Pengbo), SUMITOMO HEAVY INDUSTRIES,LTD.
Counterparty overviewSUMITOMO HEAVY INDUSTRIES,LTD. is headquartered in Shinagawa-ku, Tokyo. 中国生物科技服務控股有限公司 is listed on the Hong Kong Stock Exchange under Stock Code: 8037. Pengbo is a subsidiary of 中国生物科技服務控股有限公司. It obtained a license to engage in medical institution-related business in the Hainan Island Medical Special Zone and established and operates the Pengbo (Hainan) BNCT Center. Other details: Not disclosed.
Relationship with the CompanyThe Company entered into a basic agreement with 中国生物科技服務控股有限公司 and Pengbo in June 2022 for the supply of Steboronin. The Company is working with SUMITOMO HEAVY INDUSTRIES,LTD. to combine its BNCT treatment system and dose calculation program with Steboronin and, in cooperation with Pengbo, develop BNCT services in the Hainan Island Medical Special Zone.
Contract DateJune 2022 (basic agreement)
Launch date19 March 2026 (actual; first treatment for head and neck cancer), with treatment also administered to 1 patient on 20 March 2026. The Center opened on 7 February 2026 (actual).
Applicable areaUnresectable, locally advanced or locally recurrent head and neck cancer. If a new indication is approved in Japan in the future, it may become eligible for treatment in the Hainan Island Medical Special Zone.
LocationBoao Lecheng International Medical Tourism Pilot Zone, Hainan, China
Usage history1 patient treated on each of 19 and 20 March 2026 (2 patients in total; actual results as of the commencement of treatment)
Impact on Business PerformanceThe impact on results for the fiscal year ending March 2026 is immaterial.
Items this document does not state (8)
Contract ValueOffering priceAward/certification nameAwarding / certifying bodyRegistration number and expiry dateLocation scaleQuantitative EffectsSource

These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.

The reasons the company gives

The company's own explanation, not something inferred from the numbers.

Following the Center's opening, its medical team held repeated consultations with Osaka Medical and Pharmaceutical University, including case reviews, and proceeded with preparations for the first treatment. The Center was also partially damaged by flooding caused by a typhoon at the end of October 2024, and restoration work required time.

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Announcement regarding the commencement of treatment at the Pengbo (Hainan) BNCT Center | STELLA PHARMA CORPORATION (4888) timely disclosure | Komori