Patients With a Positive FIT Fail to Get Follow-Up Colonoscopies

PHOENIX -- Patients with or without polyp removal in an index colonoscopy commonly receive follow-up surveillance with a fecal immunochemical test (FIT), yet many of these patients do not receive a recommended colonoscopy after a positive FIT.

"In this large US study, we found interval FITs are frequently performed in patients with and without prior polypectomy," said first author Natalie J. Wilson, MD, of the University of Minnesota in Minneapolis, while presenting the findings this week at the American College of Gastroenterology (ACG) 2025 Annual Scientific Meeting.

"These findings reinforce the importance of colonoscopy following positive interval FIT, given the high risk of advanced neoplasia and colorectal cancer, regardless of polypectomy history," Wilson said.

Guideline recommendations stress the need for follow-up surveillance with a colonoscopy, particularly in patients who have had a prior polypectomy, due to the higher risk.

Reasons patients may instead turn to FIT include cost or other factors.

To determine just how often that happens, how having a previous polypectomy affects FIT results, and how adherent patients are to follow up if a FIT result is positive, Wilson and her colleagues evaluated data from nearly 4.8 million individuals in the Veterans Health Administration Corporate Data Warehouse who underwent colonoscopy between 2000 and 2004.

Of the patients, 10.9% were found to have subsequently received interval FIT within 10 years of the index colonoscopy, and of those patients, nearly half (49.9%) had received a polypectomy at the index colonoscopy.

The average time from the colonoscopy/polypectomy to the interval FIT was 5.9 years (5.6 years in the polypectomy group vs 6.2 years in the nonpolypectomy group).

Among the FIT screenings, results were positive in 17.2% of postpolypectomy patients and 14.1% of patients who no prior polypectomy, indicating a history of polypectomy to be predictive of positive interval FIT (odds ratio [OR], 1.12; P < .0001).

Notably, while a follow-up colonoscopy is considered essential following a positive FIT result -- and having a previous polypectomy should add further emergency to the matter -- the study showed only 50.4% of those who had an earlier polypectomy went on to receive the recommended follow-up colonoscopy after a positive follow-up FIT, and the rate was 49.3% among those who had not received a polypectomy (P = .001).

For those who did receive a follow-up colonoscopy after a positive FIT, the duration of time to receiving the colonoscopy was longer among those who had a prior polypectomy, at 2.9 months compared with 2.5 months in the nonpolypectomy group (P < .001).

Colonoscopy results following a positive FIT showed higher rates of detections among patients who had prior polypectomies than among those with no prior polypectomy, including tubular adenomas (54.7% vs 45.8%), tubulovillous adenomas (5.6% vs 4.7%), adenomas with high-grade dysplasia (0.8% vs 0.7%), sessile serrated lesions (3.52% vs 2.4%), advanced colorectal neoplasia (9.2% vs 7.9%), and colorectal cancer (3.3% vs 3.0%).

However, a prior polypectomy was not independently predictive of colorectal cancer (OR, 0.96; P = .65) or advanced colorectal neoplasia (OR, 0.97; P = .57) in the postcolonoscopy interval FIT.

The findings underscore that "positive results carried a high risk of advanced neoplasia or cancer, irrespective or prior polypectomy history," Wilson said.

Commenting on the study, William D. Chey, MD, chief of the Division of Gastroenterology & Hepatology at the University of Michigan in Ann Arbor, Michigan, noted that the study "addresses one of the biggest challenges we face as a profession, which is making sure that patients who have a positive stool test get a colonoscopy."

He noted that the low rate of just 50% of recipients of positive FITs going on to receive a colonoscopy is consistent with what is observed in other trials.

"Other data suggest that the rate might even be significantly higher -- at 70% to 80%, depending upon the population and the test," Chey told Medscape Medical News.

Reasons for the failure to receive the follow-up testing range from income restrictions (due to the high cost of a colonoscopy, especially if not covered by insurance), education, speaking a foreign language, and other factors, he said.

The relatively high rates of colon cancers detected by FIT in the study, in those with and without a prior polypectomy, along with findings from other studies "should raise questions about whether there might be a role for FIT testing in addition to colonoscopy." However, much stronger evidence would be needed, Chey noted.

In the meantime, a key issue is "how do we do a better job of making sure that individuals who have a positive FIT test get a colonoscopy," he said.

"I think a lot of this is going to come down to how it's down at the primary care level."

Chey added that in that, and any other setting, "the main message that needs to get out to people who are undergoing stool-based screening is that the stool test is only the first part of the screening process, and if it's positive, a follow-up colonoscopy must be performed.

"Otherwise, the stool-based test is of no value."

Wilson had no disclosures to report. Chey's disclosures include consulting and/or other relationships with Ardelyx, Atmo, Biomerica, Commonwealth Diagnostics International, Corprata, Dieta, Evinature, Food Marble, Gemelli, Kiwi BioScience, Modify Health, Nestle, Phathom, Redhill, Salix/Valean, Takeda, and Vibrant.

A version of this article first appeared on Medscape.com.

PHOENIX -- Patients with or without polyp removal in an index colonoscopy commonly receive follow-up surveillance with a fecal immunochemical test (FIT), yet many of these patients do not receive a recommended colonoscopy after a positive FIT.

"In this large US study, we found interval FITs are frequently performed in patients with and without prior polypectomy," said first author Natalie J. Wilson, MD, of the University of Minnesota in Minneapolis, while presenting the findings this week at the American College of Gastroenterology (ACG) 2025 Annual Scientific Meeting.

"These findings reinforce the importance of colonoscopy following positive interval FIT, given the high risk of advanced neoplasia and colorectal cancer, regardless of polypectomy history," Wilson said.

Guideline recommendations stress the need for follow-up surveillance with a colonoscopy, particularly in patients who have had a prior polypectomy, due to the higher risk.

Reasons patients may instead turn to FIT include cost or other factors.

To determine just how often that happens, how having a previous polypectomy affects FIT results, and how adherent patients are to follow up if a FIT result is positive, Wilson and her colleagues evaluated data from nearly 4.8 million individuals in the Veterans Health Administration Corporate Data Warehouse who underwent colonoscopy between 2000 and 2004.

Of the patients, 10.9% were found to have subsequently received interval FIT within 10 years of the index colonoscopy, and of those patients, nearly half (49.9%) had received a polypectomy at the index colonoscopy.

The average time from the colonoscopy/polypectomy to the interval FIT was 5.9 years (5.6 years in the polypectomy group vs 6.2 years in the nonpolypectomy group).

Among the FIT screenings, results were positive in 17.2% of postpolypectomy patients and 14.1% of patients who no prior polypectomy, indicating a history of polypectomy to be predictive of positive interval FIT (odds ratio [OR], 1.12; P < .0001).

Notably, while a follow-up colonoscopy is considered essential following a positive FIT result -- and having a previous polypectomy should add further emergency to the matter -- the study showed only 50.4% of those who had an earlier polypectomy went on to receive the recommended follow-up colonoscopy after a positive follow-up FIT, and the rate was 49.3% among those who had not received a polypectomy (P = .001).

For those who did receive a follow-up colonoscopy after a positive FIT, the duration of time to receiving the colonoscopy was longer among those who had a prior polypectomy, at 2.9 months compared with 2.5 months in the nonpolypectomy group (P < .001).

Colonoscopy results following a positive FIT showed higher rates of detections among patients who had prior polypectomies than among those with no prior polypectomy, including tubular adenomas (54.7% vs 45.8%), tubulovillous adenomas (5.6% vs 4.7%), adenomas with high-grade dysplasia (0.8% vs 0.7%), sessile serrated lesions (3.52% vs 2.4%), advanced colorectal neoplasia (9.2% vs 7.9%), and colorectal cancer (3.3% vs 3.0%).

However, a prior polypectomy was not independently predictive of colorectal cancer (OR, 0.96; P = .65) or advanced colorectal neoplasia (OR, 0.97; P = .57) in the postcolonoscopy interval FIT.

The findings underscore that "positive results carried a high risk of advanced neoplasia or cancer, irrespective or prior polypectomy history," Wilson said.

Commenting on the study, William D. Chey, MD, chief of the Division of Gastroenterology & Hepatology at the University of Michigan in Ann Arbor, Michigan, noted that the study "addresses one of the biggest challenges we face as a profession, which is making sure that patients who have a positive stool test get a colonoscopy."

He noted that the low rate of just 50% of recipients of positive FITs going on to receive a colonoscopy is consistent with what is observed in other trials.

"Other data suggest that the rate might even be significantly higher -- at 70% to 80%, depending upon the population and the test," Chey told Medscape Medical News.

Reasons for the failure to receive the follow-up testing range from income restrictions (due to the high cost of a colonoscopy, especially if not covered by insurance), education, speaking a foreign language, and other factors, he said.

The relatively high rates of colon cancers detected by FIT in the study, in those with and without a prior polypectomy, along with findings from other studies "should raise questions about whether there might be a role for FIT testing in addition to colonoscopy." However, much stronger evidence would be needed, Chey noted.

In the meantime, a key issue is "how do we do a better job of making sure that individuals who have a positive FIT test get a colonoscopy," he said.

"I think a lot of this is going to come down to how it's down at the primary care level."

Chey added that in that, and any other setting, "the main message that needs to get out to people who are undergoing stool-based screening is that the stool test is only the first part of the screening process, and if it's positive, a follow-up colonoscopy must be performed.

"Otherwise, the stool-based test is of no value."

Wilson had no disclosures to report. Chey's disclosures include consulting and/or other relationships with Ardelyx, Atmo, Biomerica, Commonwealth Diagnostics International, Corprata, Dieta, Evinature, Food Marble, Gemelli, Kiwi BioScience, Modify Health, Nestle, Phathom, Redhill, Salix/Valean, Takeda, and Vibrant.

A version of this article first appeared on Medscape.com.

PHOENIX -- Patients with or without polyp removal in an index colonoscopy commonly receive follow-up surveillance with a fecal immunochemical test (FIT), yet many of these patients do not receive a recommended colonoscopy after a positive FIT.

"In this large US study, we found interval FITs are frequently performed in patients with and without prior polypectomy," said first author Natalie J. Wilson, MD, of the University of Minnesota in Minneapolis, while presenting the findings this week at the American College of Gastroenterology (ACG) 2025 Annual Scientific Meeting.

"These findings reinforce the importance of colonoscopy following positive interval FIT, given the high risk of advanced neoplasia and colorectal cancer, regardless of polypectomy history," Wilson said.

Guideline recommendations stress the need for follow-up surveillance with a colonoscopy, particularly in patients who have had a prior polypectomy, due to the higher risk.

Reasons patients may instead turn to FIT include cost or other factors.

To determine just how often that happens, how having a previous polypectomy affects FIT results, and how adherent patients are to follow up if a FIT result is positive, Wilson and her colleagues evaluated data from nearly 4.8 million individuals in the Veterans Health Administration Corporate Data Warehouse who underwent colonoscopy between 2000 and 2004.

Of the patients, 10.9% were found to have subsequently received interval FIT within 10 years of the index colonoscopy, and of those patients, nearly half (49.9%) had received a polypectomy at the index colonoscopy.

The average time from the colonoscopy/polypectomy to the interval FIT was 5.9 years (5.6 years in the polypectomy group vs 6.2 years in the nonpolypectomy group).

Among the FIT screenings, results were positive in 17.2% of postpolypectomy patients and 14.1% of patients who no prior polypectomy, indicating a history of polypectomy to be predictive of positive interval FIT (odds ratio [OR], 1.12; P < .0001).

Notably, while a follow-up colonoscopy is considered essential following a positive FIT result -- and having a previous polypectomy should add further emergency to the matter -- the study showed only 50.4% of those who had an earlier polypectomy went on to receive the recommended follow-up colonoscopy after a positive follow-up FIT, and the rate was 49.3% among those who had not received a polypectomy (P = .001).

For those who did receive a follow-up colonoscopy after a positive FIT, the duration of time to receiving the colonoscopy was longer among those who had a prior polypectomy, at 2.9 months compared with 2.5 months in the nonpolypectomy group (P < .001).

Colonoscopy results following a positive FIT showed higher rates of detections among patients who had prior polypectomies than among those with no prior polypectomy, including tubular adenomas (54.7% vs 45.8%), tubulovillous adenomas (5.6% vs 4.7%), adenomas with high-grade dysplasia (0.8% vs 0.7%), sessile serrated lesions (3.52% vs 2.4%), advanced colorectal neoplasia (9.2% vs 7.9%), and colorectal cancer (3.3% vs 3.0%).

However, a prior polypectomy was not independently predictive of colorectal cancer (OR, 0.96; P = .65) or advanced colorectal neoplasia (OR, 0.97; P = .57) in the postcolonoscopy interval FIT.

The findings underscore that "positive results carried a high risk of advanced neoplasia or cancer, irrespective or prior polypectomy history," Wilson said.

Commenting on the study, William D. Chey, MD, chief of the Division of Gastroenterology & Hepatology at the University of Michigan in Ann Arbor, Michigan, noted that the study "addresses one of the biggest challenges we face as a profession, which is making sure that patients who have a positive stool test get a colonoscopy."

He noted that the low rate of just 50% of recipients of positive FITs going on to receive a colonoscopy is consistent with what is observed in other trials.

"Other data suggest that the rate might even be significantly higher -- at 70% to 80%, depending upon the population and the test," Chey told Medscape Medical News.

Reasons for the failure to receive the follow-up testing range from income restrictions (due to the high cost of a colonoscopy, especially if not covered by insurance), education, speaking a foreign language, and other factors, he said.

The relatively high rates of colon cancers detected by FIT in the study, in those with and without a prior polypectomy, along with findings from other studies "should raise questions about whether there might be a role for FIT testing in addition to colonoscopy." However, much stronger evidence would be needed, Chey noted.

In the meantime, a key issue is "how do we do a better job of making sure that individuals who have a positive FIT test get a colonoscopy," he said.

"I think a lot of this is going to come down to how it's down at the primary care level."

Chey added that in that, and any other setting, "the main message that needs to get out to people who are undergoing stool-based screening is that the stool test is only the first part of the screening process, and if it's positive, a follow-up colonoscopy must be performed.

"Otherwise, the stool-based test is of no value."

Wilson had no disclosures to report. Chey's disclosures include consulting and/or other relationships with Ardelyx, Atmo, Biomerica, Commonwealth Diagnostics International, Corprata, Dieta, Evinature, Food Marble, Gemelli, Kiwi BioScience, Modify Health, Nestle, Phathom, Redhill, Salix/Valean, Takeda, and Vibrant.

A version of this article first appeared on Medscape.com.