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How common is serrated polyposis syndrome? • The Medical RepublicThe Medical Republic

How common is serrated polyposis syndrome? • The Medical RepublicThe Medical Republic

Serrated polyposis syndrome was outlined with arbitrary standards by Burt and Jass in 2000.1 Epidemiological research from the identical time reported an incidence as little as one in 3000 on screening sigmoidoscopy.2, three

Newer knowledge recommended that the situation is extra prevalent than beforehand thought, with charges of zero.three%, zero.four% and zero.eight% reported in Italian4, Spanish and Dutch cohorts respectively5. 

This alteration in epidemiology possible displays a change in detection price. This elevated detection might relate to a number of elements, together with improved endoscopy gear, cut up bowel preparation and improved endoscopist consciousness of sessile serrated adenoma endoscopic appearances and morphology. 

It is now obvious that serrated polyposis syndrome is not a “rare syndrome”, nevertheless the precise prevalence stays unknown6 and there seems to be a big geographic variability.5 Danger elements for the event of those lesions are additionally largely unknown. 

Australian authors have led the world in each describing the biology and pathology of sessile serrated lesions and articulating the potential danger that these lesions current endoscopically.7-10

In 2018, we’ll current knowledge to the European Gastroenterology Assembly in Austria, from a regional Australian cohort displaying that the speed of serrated polyposis syndrome  is within the order of 1 in 33 sufferers who current for colonoscopy for any trigger. 

This is by far the very best fee ever reported. We recognized an older imply age in each women and men, however in ladies there seems to be two peaks with a cohort of younger ladies recognized of their 30s.

So, what is it that proves dangerous about these lesions, what ought to common practitioners find out about this syndrome, and the way does it slot in with bowel most cancers screening?

Firstly, these lesions are flat, typically very flat, they resemble the encompassing mucosa and require a excessive diploma of vigilance on the a part of the endoscopist and satisfactory coaching to determine tell-tale “shadows” which will point out their presence (reminiscent of a mucus cap). 

The endoscopist then must be cautious to determine the complete extent of the lesion to keep away from partially resecting these lesions, leaving adenoma in place. 

The subsequent step is co-ordination with the histopathologist. The histopathology resembles a hyperplastic polyp and requires a cautious microscopic examination to appropriately determine their tell-tale options. 

Communication between the endoscopist and histopathologist can see a change within the “risk profile” of those lesions.11 The attainable predilection for the fitting colon has led some authors to hypothesise that these lesions could also be partly liable for the decrease “protection” of the proper colon for colorectal carcinoma submit colonoscopy than the left colon.12

All of this info must be collated together with the household historical past, which has bearing within the analysis of this syndrome.

At present the standards for this syndrome requires that a affected person current with a selected quantity and/or measurement and site of those polyps or have a member of the family with the syndrome and have simply one in every of these sessile serrated lesions (polyp).

GPs ought to be conscious that this syndrome will increase the danger of bowel most cancers and requires common surveillance colonoscopy. 

The GP also needs to concentrate on a few of the non-invasive check efficiency traits that may result in this being missed. 

Faecal occult blood testing in all its present types makes use of an immunochemistry check for intact human haemoglobin. This requires a small quantity of blood to be misplaced from the lesion or polyp.

For a few years it has been recognized that this check performs higher with extra superior lesions (greater sensitivity). It might seem that sessile serrated lesions have a tendency to not leak blood as typically till they’re superior lesions.13 This impairs the power of non-invasive checks to detect these lesions, determine in danger people and subsequently enrol these sufferers in applicable surveillance packages.

It will additionally seem that not all sessile serrated lesions are equal.

For a few years it has been recognized that the faecal occult blood testing performs higher with extra superior lesions

The pure historical past of many of those lesions is indolent. Nevertheless, as soon as a lesion develops dysplasia the time to most cancers is accelerated, probably within the order of simply a few years.

Australian researchers have proven that this pathway is not a common explanation for bowel most cancers in younger individuals, nevertheless it is unknown whether or not these lesions are a danger issue for different lesions.eight

Once I moved to Port Macquarie, New South Wales, in 2013, I observed that some sufferers who had beforehand had colonoscopies had a number of sessile serrated lesions at surveillance colonoscopy. It appeared that these lesions and other people with a number of lesions have been extra common than anticipated. 

I had launched cut up bowel preparation and hypothesised that improved cleansing of the proper colon might have improved the detection of those lesions.

In late 2014, new endoscopes have been bought and detection of those lesions once more elevated. We subsequently examined knowledge from all of the sufferers present process colonoscopy in my apply between January 2015 and March 2018. Sufferers discovered to have serrated polyposis syndrome, as outlined by the WHO revised standards, have been included.

We discovered that within the research interval, 3725 separate sufferers underwent colonoscopy and that serrated polyposis syndrome was recognized in 110 of those (2.95%). This group was predominately feminine (68/110; 62%) and had a mean age of 66.three years (SD = 13.1; vary 24-88 years). 22% of sufferers had a smoking historical past (5% present people who smoke; 16% former people who smoke), 9% of sufferers have been diabetic and 20% consumed two or extra normal drinks of alcohol per day.  Nearl half (47%) of sufferers had a household historical past of bowel most cancers (32% in a primary diploma relative and 15% a second diploma relative) and 15% of sufferers underwent colonoscopy for the analysis of a constructive FOBT. 

A lot of the sufferers (107/110, 97%) have been recognized with serrated polyposis syndrome based mostly on the WHO standards of getting 5 or extra polyps proximal to the splenic flexure with at the least two higher than 10mm. 

Three (three%) sufferers had a first-degree relative with the syndrome and at the very least one serrated lesion. The median variety of lesions detected throughout colonoscopy was eight (vary: 5-30) after which imply measurement of the most important lesion was 18mm (SD = 5.4mm). Dysplasia was detected inside a serrated polyp in 30% of sufferers. In a majority of sufferers, different polyp varieties have been additionally detected throughout colonoscopy (83%) with typical tubular adenomas (33%) and hyperplastic polyps (7%) being probably the most common (42% had a number of different polyp varieties).  

We additionally famous that there was a bimodal distribution of feminine sufferers with a peak within the early years. Whereas this will likely symbolize a variety bias, it warrants additional research.

This knowledge raises questions concerning the true prevalence of this situation in Australia. We’ve no knowledge to recommend that sufferers on the mid-north coast (lots of whom have lived most of their lives in bigger cities and retire right here) symbolize a special (biased) pattern (although extra analysis is wanted). 

Is that this fee as a result of a detection bias? 

This is definitely our main speculation based mostly on improved bowel preparation, gear and coaching. 

If this is a extra common situation than beforehand thought, it might have implications on screening because of the comparatively poor efficiency of FOBT in detecting these lesions. 

It is potential that a new paradigm may emerge when fascinated with find out how to display for sessile serrated lesions. The query turns into, how you can greatest display for sessile serrated lesions or serrated polyposis syndrome? 

It might come to cross that in future iterations of bowel most cancers screening tips, Australians might comply with the trail of American societies and advocate both optical or non-invasive investigations as first-line screening for common danger people fairly than non-invasive solely. 

There are vital points to think about when arguing for colonoscopic screening. 

Firstly, as GPs and sufferers know, this process has a small however actual danger of hurt. Secondly there is a price to the well being system for these procedures and a constructive check (detection of sessile serrated lesions) might imply that a affected person is left with a big screening burden (particularly throughout childbearing years), which carries extra danger. 

Ideally, we’ll develop a “Goldilocks” information for our sufferers the place screening is carried out utilizing probably the most applicable software, not too typically to extend the dangers related to colonoscopy, however not too occasionally to extend the danger of interval colorectal carcinoma. 

There seems to be a worldwide development to earlier screening for colorectal carcinoma. 

As we study extra concerning the epidemiology of serrated polyposis syndrome  and sessile serrated lesions, tips might develop to tailor our strategy to detection of those lesions and this syndrome.

Dr Stuart Kostalas is a gastroenterologist in Port Macquarie, NSW. He has a Masters in Drugs (Medical Epidemiology) and is at present finishing additional postgraduate research (MSc) within the Centre for Proof-Based mostly Drugs on the College of Oxford. His medical pursuits are superior mucosal resection, together with endoscopic submucosal dissection of neoplastic tissue within the GI tract and the detection of sessile serrated lesions.


1. Snover DC, Ahnen DJ, Burt RW, Odze RD. Serrated polyps of the colon and rectum and serrated (“hyperplastic”) polyposis. In: Bosman FT, Carneiro F, Hruban RH, Theise ND, editors. WHO classification of tumours of the digestive system. 4th ed. Lyon: Worldwide Company for Analysis on Most cancers; 2010.

2. Lockett MJ, Atkin WS. Hyperplastic polyposis (HPP): prevalence and most cancers danger. Gastroenterology. 2001;120(5):A742.

three. van Herwaarden YJ, Verstegen MH, Dura P, Kievit W, Drenth JP, Dekker E, et al. Low prevalence of serrated polyposis syndrome in screening populations: a scientific evaluate. Endoscopy. 2015;47(11):1043-9.

four. Colussi D, Zagari RM, Morini B, Fabbri M, Montale A, Hassan C, et al. Prevalence of serrated polyposis syndrome in an FIT-based colorectal most cancers screening cohort in Italy. Intestine. 2016.

5. IJspeert JEG, Bevan R, Senore C, Kaminski MF, Kuipers EJ, Mroz A, et al. Detection fee of serrated polyps and serrated polyposis syndrome in colorectal most cancers screening cohorts: a European overview. Intestine. 2017;66(7):1225-32.

6. Sweetser S, Smyrk TC, Sinicrope FA. Serrated colon polyps as precursors to colorectal most cancers. Medical Gastroenterology and Hepatology. 2013;11(7):760-7.

7. Burgess NG, Tutticci NJ, Pellise M, Bourke MJ. Sessile serrated adenomas/polyps with cytologic dysplasia: a triple menace for interval most cancers. Gastrointestinal endoscopy. 2014;80(2):307-10.

eight.  Liu C, Bettington ML, Walker NI, Dwine J, Hartel GF, Leggett BA, et al. CpG Island Methylation in Sessile Serrated Adenomas Will increase with Age, Indicating Decrease Danger of Malignancy in Younger Sufferers. Gastroenterology. 2018.

9. Bettington M, Walker N, Rosty C, Brown I, Clouston A, Wockner L, et al. Crucial appraisal of the analysis of the sessile serrated adenoma. The American journal of surgical pathology. 2014;38(2):158-66.

10.  Fernando WC, Miranda MS, Worthley DL, Togashi Okay, Watters DJ, Leggett BA, et al. The CIMP Phenotype in BRAF Mutant Serrated Polyps from a Potential Colonoscopy Affected person Cohort. Gastroenterology analysis and apply. 2014;2014:374926.

11. Tate DJ, Jayanna M, Awadie H, Desomer L, Lee R, Heitman SJ, et al. A standardized imaging protocol for the endoscopic prediction of dysplasia inside sessile serrated polyps (with video). Gastrointest Endosc. 2018;87(1):222-31.e2.

12. Hermann Brenner, Michael Hoffmeister, Volker Arndt, Christa Stegmaier, Lutz Altenhofen, Ulrike Haug; Safety From Proper- and Left-Sided Colorectal Neoplasms After Colonoscopy: Inhabitants-Based mostly Research, JNCI: Journal of the Nationwide Most cancers Institute, Quantity 102, Problem 2, 20 January 2010, Pages 89–95.

13.  Hirai HW, Tsoi KK, Chan JY, et al. Systematic evaluation with meta-analysis: faecal occult blood exams present decrease colorectal most cancers detection charges within the proximal colon in colonoscopy-verified diagnostic research. Aliment Pharmacol Ther. 2016 Apr;43(7):755-64.

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