JPS phenotype in patients with SMAD4
| Patient (n=33) | Screened (n) | Presence n (%) |
| Criteria defined by Jass et al for JPS | 31 | 25 (81) |
| Stomach | 31 | |
| Presence of polyps | 23 (74) | |
| Confluent aspect of polyps | 12 (41) | |
| Gastrectomy | 7 (21) | |
| Small intestine | 31 | |
| Presence of polyps | 12 (39) | |
| Median age at first polyp (years—min−max) | 47 (13–58) | |
| Colon and rectum | 30 (97) | |
| Median age at first polyp (years—min−max) | 31 (8–58) | |
| Hemicolectomy/Colectomy | 8 (29) | |
| Prophylactic | 4 | |
| Curative | 4 | |
| Digestive cancer | 4 (13) | |
| Colonic adenocarcinoma | 3 (10) | |
| Gastric adenocarcinoma | 1 (3) | |
| Duodenal adenocarcinoma | 1 (3) | |
| Pancreatic adenocarcinoma | 1 (3) |
Stomach and small intestine were explored with duodenogastroscopy. Colon and rectum were explored with colonoscopy.
JPS, juvenile polyposis syndrome; max, maximum; min, minimum.