Fig. 2

Patient-based PET/CT outcome and CRC recurrence in relation to CEA quartiles. The population was subdivided into four groups: Group Q1 (n = 19), below the first quartile; group Q2 (n = 18), between the first quartile and the median; group Q3 (n = 18), between the median and the third quartile; and group Q4 (n = 18), above the third quartile. White boxes: PET/CT-positive, black boxes: Verified CRC recurrence