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Effects of age on cancer antigen 19-9 levels and the human microbiome
| Age < 69 yr (n = 17) | Age ≥ 69 yr (n = 17) | P value | |
| CA19-9, U/mL, median (range) | 7.1 (2-129.3) | 4.9 (2-9893.2) | 0.77 |
| Bifidobacterium, %, median (range) | 0.3 (0-0.5) | 0 (0-4.5) | 0.3 |
| Clostridium cluster XVIII, %, median (range) | 2.6 (0-5.7) | 1.8 (0-14.9) | 0.82 |
| Prevotella, %, median (range) | 1.3 (0-18.2) | 1.9 (0-25.9) | 0.56 |
CA19-9: Cancer antigen 19-9.
