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Clinical target volume definition in radiotherapy

We will organize an international expert workshop on clinical target volume (CTV) definition in radiotherapy. The workshop will take place at Monte Verità conference center in Ascona, Switzerland and is supported by Congressi Stefano Franscini. 

Dates: 15.03.2026 - 18.03.2026
Venue: Monte Verità conference center, Ascona, CH
Organizer: Jan Unkelbach
Co-organizers: Thomas Bortfeld, Vincent Grégoire, Jennifer Dhont

The work shop will focus on the development of quantitative computational tools to support and improve CTV definition. The format of the workshop will be similar to the ESTRO physics workshops. Most of the time is reserved for interactive discussion. Participants should be involved in research on target volume definition in radiotherapy and actively contribute to the discussion.

Participation: The application process will be started later this year.  

Please contact Jan Unkelbach for further information in the meantime.

Preliminary program

Sunday 15.03.2026

18:00 Welcome reception
19:00 Dinner

Monday 16.03.2026

Nodal CTV definition (CTV-N)
  • Statistical models of lymphatic tumor progression
  • Quantification of risk of occult metastases
  • Applications in head&neck, breast, and prostate cancer
  • Ongoing clinical trials on CTV-N personalization and volume deescalation

Tuesday 17.03.2026

Primary tumor CTV defintion (CTV-T)
  • Mathematical tumor growth models
  • Automation of GTV-to-CTV expansion
  • Applications in glioma and other cancers
  • Ongoing clinical trials related to CTV-T definition

Wednesday 18.03.2026

Other topics
  • Dose prescription in the CTV
  • Future directions
  • Funding opportunities
12:30 Lunch
14:00 Wrap-up discussion
15:00 Departure of participants