The COST Action CA23125 - TETRA (The mETamaterial foRmalism approach to recognize cAncer) project has successfully concluded its inaugural Summer School on Biophotonics, AI and Data Analysis, held June 9-13, 2025, at Hotel Calabona in Alghero, Sardinia, Italy.

Under the leadership of Chair Prof. Francesco Saverio Pavone (University of Florence) and Programme Committee members Victoria Barygina and Roberto Inchingolo, the five-day intensive program brought together world renowned experts and emerging researchers in the field of biophotonics. The summer school featured two distinguished keynote speakers: Prof. Paul French from Imperial College London & Francis Crick Institute, who presented "An open-source modular approach to research microscopy including machine learning," and Prof. Daniel Razansky from University of Zurich and ETH, who delivered a comprehensive lecture on "Optoacoustic imaging - instrumentation, algorithms, and applications." The curriculum included cutting edge presentations from leading international researchers covering diverse topics such as optical coherence tomography, semiconductor lasers, dynamic light scattering imaging, metamaterials applications, advanced microscopy techniques, and AI-assisted spectroscopic analysis. Notable presentations included contributions from TETRA project coordinator Prof. Tatjana Gric on metamaterials roadmaps and Co-PI Prof. Edik Rafailov on photonics applications in biomedical imaging. The summer school showcased exceptional research diversity through 17 submitted poster presentations, covering topics from orbital angular momentum beams for cancer diagnostics to AI-assisted breath analysis for neonatal health monitoring. Two dedicated poster sessions allowed participants to engage directly with research developments in the field. Participants benefited from networking opportunities, discussions, and collaborative sessions that fostered international partnerships and knowledge exchange. The event successfully fulfilled TETRA's mission to enhance research skills, facilitate expert engagement, and advance metamaterial applications in cancer detection and biomedical diagnostics. The summer school concluded with best poster nominations and a dedicated TETRA Management Committee meeting, setting the foundation for continued collaboration and future scientific endeavors within the TETRA network.