When and where is SIOP 2026 taking place?

SIOP 2026, the 58th Annual Congress of the International Society of Paediatric Oncology, takes place September 15-18, 2026 at the Henry B. González Convention Center, 900 E Market St, San Antonio, Texas, USA.

Who should attend the SIOP Congress?

The congress is aimed at multidisciplinary childhood and adolescent cancer professionals, including physicians, surgeons, nurses, allied health and psychosocial workers, scientists and researchers, as well as parents and survivors. It typically draws over 2,500 attendees from more than 100 countries.

What are the key registration and abstract deadlines?

The abstract submission deadline is March 17, 2026, early registration ends June 23, 2026, the late-breaking abstract deadline is August 11, 2026, and the late registration deadline is August 18, 2026.

Will sessions be available online?

The congress is held in-person and will not be broadcast live, but all sessions are recorded and made available on-demand. In-person delegates receive on-demand access via the virtual platform for up to 3 months after the meeting, and a virtual/online registration option is also offered.

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Q: How do I register and what does it cost?

Registration is completed online via the official SIOP 2026 portal. Fees vary by deadline, membership and country income group; for example, member physicians from high-income countries pay 850 USD early bird, 1,100 USD late and 1,400 USD onsite, with reduced rates for nurses, trainees, allied health and lower-income economies, plus virtual options.

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Attendance

SIOP 2026 anticipates a large international multidisciplinary audience. The congress draws over 2,500 multi-disciplinary health care professionals from over 100 countries and hundreds of health care institutes, hospitals, universities and other organizations, and these attendees are frequently decision makers at their institutions. The wider society reflects this reach: SIOP has over 3,500 members in over 130 countries, including doctors, nurses, other health-care professionals, scientists and researchers.

According to statistics reported from the previous (SIOP 2025, Amsterdam) congress, the largest professional groups among participants were Pediatric Hematology/Oncology at 30.14%, Oncology at 18.78%, and Pediatric Surgery at 8.02%. Leading topics of interest included Neuroblastoma (6.77%), Acute Lymphoblastic Leukaemia (6.25%) and Supportive Care/Palliative Care (5.72%).

Registration

Registration is completed online through the official SIOP 2026 portal. Delegates are advised to register only via the official website, directly with the official Conference organizer, or through a trusted group registration service, as there are fraudulent websites impersonating SIOP 2026.

Fees are tiered by deadline, membership status and country income group. Member physicians from high-income countries pay 850 USD (early bird until June 23, 2026), 1,100 USD (late, June 24–August 18, 2026) and 1,400 USD (onsite from August 19, 2026). Reduced rates apply for nurses, trainees/students, allied health, CCI, parents/survivors, and delegates from lower-income economies, and discounted Virtual/Online options are also available.

Key registration details:

Early Registration Deadline: June 23, 2026.
Late Registration Deadline: August 18, 2026.
Payment is accepted by credit card (Visa, MasterCard, American Express) or by bank transfer (with an additional 30 USD handling fee).
To register a group of 10 or more people, a dedicated group registration form is available.

The in-person fee covers access to all sessions, the Opening Ceremony and Welcome Reception, the exhibition and poster area, refreshments per the timetable, and on-demand access on the virtual platform for up to 3 months after the meeting.

History

SIOP 2026 marks the 58th Annual Congress of the International Society of Paediatric Oncology, an event held annually in rotating international host cities. SIOP is the only global multidisciplinary society entirely devoted to paediatric and adolescent cancer. The society's vision is that no child should die of cancer and that cure can be achieved with no or minimal late effects.

Recent editions include SIOP 2023 in Ottawa, Canada and SIOP 2025 in Amsterdam, The Netherlands, with the 2026 congress moving to San Antonio, Texas.