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Clinical target volume definition in radiotherapy

We organized an international expert workshop on clinical target volume (CTV) definition in radiotherapy. The workshop took place at Monte Verità conference center in Ascona, Switzerland, was supported by Congressi Stefano Franscini and endorsed by ESTRO

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 workshop focused on the development of quantitative computational tools to support and improve CTV definition. The format of the workshop was similar to the ESTRO physics workshops. About half the time was reserved for interactive and lively discussion. 

See the full program and list of participants here (PDF, 61 KB).

Monte Verita workshop participants

 

Program overview

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)
  • Tumor progression within the prostate gland
  • Automation of GTV-to-CTV expansion for glioma
  • Ongoing clinical trials related to CTV-T definition

Wednesday 18.03.2026

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