FN1 and colorectal carcinoma: The study used qPCR to examine the prevalence and amount of Fusobacterium nucleatum (Fn), Porphyromonas gingivalis (Pg), and Streptococcus gallolyticus (Sg). Saliva samples of CRC patients had higher amounts of Fn (p = 0.001) and Sg (p < 0.001) compared with the healthy control group.