Anatomic distribution of sessile serrated adenoma/polyp with and without cytologic dysplasia.
BACKGROUND
Sessile serrated adenomas/polyps (SSA/Ps) have been increasingly studied during the last 10 years. However, their detailed anatomic distribution pattern has not been studied, especially given newer (broader) criteria for the diagnosis.


OBJECTIVE
To characterize the anatomic distribution of SSA/P with and without cytologic dysplasia and to assess the demographics of these patients in a nationwide database.


METHODS
We retrospectively analyzed the database of Miraca Life Sciences Research Institute for a 1-year period. Patients with a diagnosis of SSA/P, SSA/P with low-grade cytologic dysplasia (SSA/P-LGD), SSA/P with high-grade cytologic dysplasia (SSA/P-HGD), or SSA/P with adenocarcinoma (SSA/P-ACA) were retrieved, and patients' age, sex, and specific anatomic location were analyzed.


RESULTS
A total of 11,201 patients were identified, of which 10,646 (95.0%) had SSA/P, 514 (4.6%) had SSA/P-LGD, 39 (0.35%) had SSA/P-HGD, and 2 (0.018%) had SSA/P-ACA. All SSA/Ps and more advanced lesions were significantly more common in the proximal colon-SSA/P (61.2%), SSA/P-LGD (61.2%), SSA/P-HGD (80%), and SSA/P-ACA (100%)-than in either the transverse (18.8%, 17.8%, 10.0%, and 0%, respectively) or the distal (19.9%, 21.0%, 10.0%, and 0%, respectively) colon, P < .001. Sessile serrated adenoma/polyp with cytologic dysplasia was most commonly found in the ascending colon (LGD, 31.6%) and cecum (HGD, 37.5%). Advanced SSA/Ps were disproportionally more common among older women.


CONCLUSIONS
Sessile serrated adenomas/polyps with and without cytologic dysplasia and carcinoma are predominantly found in the cecum and ascending colon, whereas there is low prevalence in both the transverse and distal colon. Confirmation of previously published data regarding demographics of advanced lesions among a different cohort and including newer (broader) criteria suggests these criteria are valid.
From the Department of Internal Medicine, Medical College of Wisconsin, Milwaukee (Dr Yang); the Division of Digestive Diseases, Department of Internal Medicine, The University of Mississippi Medical Center, Jackson (Dr Tang and Ms Wu); and Miraca Life Sciences Research Institute, Irving, Texas (Drs Lash and Yang).
Juliana F
JF
Yang
Shou-Jiang
SJ
Tang
Richard H
RH
Lash
Ruonan
R
Wu
Qinghua
Q
Yang
D000230:Adenocarcinoma / Q000473:pathology; D000236:Adenoma / Q000473:pathology*; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D003110:Colonic Neoplasms / Q000473:pathology*; D003111:Colonic Polyps / Q000473:pathology*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D055815:Young Adult