Detection and significance of small and low proliferation breast cancer

Objectives: To determine the frequency and discuss possible implications of early breast cancer with particularly good prognosis and defined by tumor diameter and cell proliferation. Setting: Detection of small and slowly growing tumors presents a challenge in breast cancer management, due to the ri...

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Published in:Journal of Medical Screening 2021
Main Authors: Hofvind, Solveig, Knutsvik, Gøril, Holen, Åsne Sørlien, Tsuruda, Kaitlyn, Akslen, Lars Andreas
Format: Article
Language:English
Subjects:
Early breast cancer
Prognoses
Tumor diameters
Tumor proliferation
Tumor stages
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container_title Journal of Medical Screening
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creator Hofvind, Solveig
Knutsvik, Gøril
Holen, Åsne Sørlien
Tsuruda, Kaitlyn
Akslen, Lars Andreas
description Objectives: To determine the frequency and discuss possible implications of early breast cancer with particularly good prognosis and defined by tumor diameter and cell proliferation. Setting: Detection of small and slowly growing tumors presents a challenge in breast cancer management, due to the risk of over-treatment. Here, we attempted to define a group of such tumors by combining small diameter (
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Setting: Detection of small and slowly growing tumors presents a challenge in breast cancer management, due to the risk of over-treatment. Here, we attempted to define a group of such tumors by combining small diameter (&lt;10 mm, T1ab tumors) with low tumor cell proliferation (&lt;10% Ki67 expression rate). These tumors were termed small low proliferation cancers (SLPC). Methods: Two population-based cohorts were studied: a small research series (n=534), and a nationwide registry-based series of prospectively collected routine data (n=8433). In the latter, we stratified by detection mode; screen-detected, interval, and breast cancers detected outside of screening. Patients were treated according to national guidelines at time of their diagnosis. For both cohorts, we compared tumor histopathology and risk of breast cancer death using a log-rank test for cases with SLPC versus non-SLPC. Results: In the research series (median follow-up 151 months), the frequency of SLPC was 10% (54/534), with one breast cancer death compared with 78 among the remaining 480 cases of non-SLPC (p=0.008). In the registry series (median follow-up 42 months), the frequency of SLPC was 10% (854/8433), with five deaths compared to 187 among the remaining 7579 cases (p=0.0004). Conclusions: SLPC was associated with very low risk of breast cancer death. Prospective randomized trials are needed to clarify whether less aggressive treatment could be a safe option for women with such early breast cancers.</description><language>eng</language><publisher>SAGE Publications</publisher><subject>Early breast cancer ; Prognoses ; Tumor diameters ; Tumor proliferation ; Tumor stages</subject><ispartof>Journal of Medical Screening, 2021</ispartof><rights>info:eu-repo/semantics/openAccess</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,776,881,26544</link.rule.ids><linktorsrc>$$Uhttp://hdl.handle.net/11250/2997182$$EView_record_in_NORA$$FView_record_in_$$GNORA$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Hofvind, Solveig</creatorcontrib><creatorcontrib>Knutsvik, Gøril</creatorcontrib><creatorcontrib>Holen, Åsne Sørlien</creatorcontrib><creatorcontrib>Tsuruda, Kaitlyn</creatorcontrib><creatorcontrib>Akslen, Lars Andreas</creatorcontrib><title>Detection and significance of small and low proliferation breast cancer</title><title>Journal of Medical Screening</title><description>Objectives: To determine the frequency and discuss possible implications of early breast cancer with particularly good prognosis and defined by tumor diameter and cell proliferation. Setting: Detection of small and slowly growing tumors presents a challenge in breast cancer management, due to the risk of over-treatment. Here, we attempted to define a group of such tumors by combining small diameter (&lt;10 mm, T1ab tumors) with low tumor cell proliferation (&lt;10% Ki67 expression rate). These tumors were termed small low proliferation cancers (SLPC). Methods: Two population-based cohorts were studied: a small research series (n=534), and a nationwide registry-based series of prospectively collected routine data (n=8433). In the latter, we stratified by detection mode; screen-detected, interval, and breast cancers detected outside of screening. Patients were treated according to national guidelines at time of their diagnosis. For both cohorts, we compared tumor histopathology and risk of breast cancer death using a log-rank test for cases with SLPC versus non-SLPC. Results: In the research series (median follow-up 151 months), the frequency of SLPC was 10% (54/534), with one breast cancer death compared with 78 among the remaining 480 cases of non-SLPC (p=0.008). In the registry series (median follow-up 42 months), the frequency of SLPC was 10% (854/8433), with five deaths compared to 187 among the remaining 7579 cases (p=0.0004). Conclusions: SLPC was associated with very low risk of breast cancer death. 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Setting: Detection of small and slowly growing tumors presents a challenge in breast cancer management, due to the risk of over-treatment. Here, we attempted to define a group of such tumors by combining small diameter (&lt;10 mm, T1ab tumors) with low tumor cell proliferation (&lt;10% Ki67 expression rate). These tumors were termed small low proliferation cancers (SLPC). Methods: Two population-based cohorts were studied: a small research series (n=534), and a nationwide registry-based series of prospectively collected routine data (n=8433). In the latter, we stratified by detection mode; screen-detected, interval, and breast cancers detected outside of screening. Patients were treated according to national guidelines at time of their diagnosis. For both cohorts, we compared tumor histopathology and risk of breast cancer death using a log-rank test for cases with SLPC versus non-SLPC. Results: In the research series (median follow-up 151 months), the frequency of SLPC was 10% (54/534), with one breast cancer death compared with 78 among the remaining 480 cases of non-SLPC (p=0.008). In the registry series (median follow-up 42 months), the frequency of SLPC was 10% (854/8433), with five deaths compared to 187 among the remaining 7579 cases (p=0.0004). Conclusions: SLPC was associated with very low risk of breast cancer death. Prospective randomized trials are needed to clarify whether less aggressive treatment could be a safe option for women with such early breast cancers.</abstract><pub>SAGE Publications</pub><oa>free_for_read</oa></addata></record>
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subjects Early breast cancer
Prognoses
Tumor diameters
Tumor proliferation
Tumor stages
title Detection and significance of small and low proliferation breast cancer
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