{"id":1872,"date":"2026-02-07T19:51:13","date_gmt":"2026-02-07T10:51:13","guid":{"rendered":"https:\/\/dev.rftcjapan.org\/?page_id=1872"},"modified":"2026-02-27T14:51:13","modified_gmt":"2026-02-27T05:51:13","slug":"lobular-carcinoma-in-situ-lcis","status":"publish","type":"page","link":"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/lobular-carcinoma-in-situ-lcis\/","title":{"rendered":"Lobular Carcinoma in Situ (LCIS)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1872\" class=\"elementor elementor-1872\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-80dd769 e-flex e-con-boxed e-con e-parent\" data-id=\"80dd769\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-56b42ce e-con-full elementor-hidden-mobile e-flex e-con e-child\" data-id=\"56b42ce\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-2a8c986 e-con-full e-flex e-con e-child\" data-id=\"2a8c986\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;sticky&quot;:&quot;top&quot;,&quot;sticky_on&quot;:[&quot;desktop&quot;,&quot;tablet&quot;],&quot;sticky_offset&quot;:100,&quot;sticky_parent&quot;:&quot;yes&quot;,&quot;sticky_effects_offset&quot;:0,&quot;sticky_anchor_link_offset&quot;:0}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cd013f6 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"cd013f6\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;],&quot;exclude_headings_by_selector&quot;:[],&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h2 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h2>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__cd013f6\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-angle-down\" viewBox=\"0 0 320 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M143 352.3L7 216.3c-9.4-9.4-9.4-24.6 0-33.9l22.6-22.6c9.4-9.4 24.6-9.4 33.9 0l96.4 96.4 96.4-96.4c9.4-9.4 24.6-9.4 33.9 0l22.6 22.6c9.4 9.4 9.4 24.6 0 33.9l-136 136c-9.2 9.4-24.4 9.4-33.8 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__cd013f6\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-angle-up\" viewBox=\"0 0 320 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M177 159.7l136 136c9.4 9.4 9.4 24.6 0 33.9l-22.6 22.6c-9.4 9.4-24.6 9.4-33.9 0L160 255.9l-96.4 96.4c-9.4 9.4-24.6 9.4-33.9 0L7 329.7c-9.4-9.4-9.4-24.6 0-33.9l136-136c9.4-9.5 24.6-9.5 34-.1z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__cd013f6\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-acf1221 elementor-widget elementor-widget-heading\" data-id=\"acf1221\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h6 class=\"elementor-heading-title elementor-size-default\">About Breast Cancer<\/h6>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a913aab elementor-widget elementor-widget-template\" data-id=\"a913aab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"template.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-template\">\n\t\t\t\t\t<div data-elementor-type=\"section\" data-elementor-id=\"3044\" class=\"elementor elementor-3044\" data-elementor-post-type=\"elementor_library\">\n\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2330\" class=\"elementor-element elementor-element-fd830c6 e-con-full e-grid e-con e-child\" data-id=\"fd830c6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2330\" class=\"elementor-element elementor-element-3717cd6 e-con-full e-flex e-con e-child\" data-id=\"3717cd6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e6c4d06 elementor-widget elementor-widget-heading\" data-id=\"e6c4d06\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Breast Cancer Basics<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c84b33f elementor-nav-menu--dropdown-none elementor-widget elementor-widget-nav-menu\" data-id=\"c84b33f\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;layout&quot;:&quot;vertical&quot;,&quot;submenu_icon&quot;:{&quot;value&quot;:&quot;&lt;i aria-hidden=\\&quot;true\\&quot; class=\\&quot;\\&quot;&gt;&lt;\\\/i&gt;&quot;,&quot;library&quot;:&quot;&quot;}}\" data-widget_type=\"nav-menu.default\">\n\t\t\t\t\t\t\t\t<nav aria-label=\"\u30e1\u30cb\u30e5\u30fc\" class=\"elementor-nav-menu--main elementor-nav-menu__container elementor-nav-menu--layout-vertical e--pointer-none\">\n\t\t\t\t<ul id=\"menu-1-c84b33f\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2517\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/what-is-breast-cancer\/\" class=\"elementor-item\">What is Breast Cancer?<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2515\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/breast-cancer-statistics-global-japan\/\" class=\"elementor-item\">Breast Cancer Statistics (Global &amp; Japan)<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2516\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/understanding-the-risk-of-breast-cancer\/\" class=\"elementor-item\">Understanding the Risk of Breast Cancer<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<nav class=\"elementor-nav-menu--dropdown elementor-nav-menu__container\" aria-hidden=\"true\">\n\t\t\t\t<ul id=\"menu-2-c84b33f\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2517\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/what-is-breast-cancer\/\" class=\"elementor-item\" tabindex=\"-1\">What is Breast Cancer?<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2515\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/breast-cancer-statistics-global-japan\/\" class=\"elementor-item\" tabindex=\"-1\">Breast Cancer Statistics (Global &amp; Japan)<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2516\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/understanding-the-risk-of-breast-cancer\/\" class=\"elementor-item\" tabindex=\"-1\">Understanding the Risk of Breast Cancer<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2330\" class=\"elementor-element elementor-element-67a9bd1 e-con-full e-flex e-con e-child\" data-id=\"67a9bd1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ed0de9e elementor-widget elementor-widget-heading\" data-id=\"ed0de9e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Diagnosis &amp; Staging<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c981917 elementor-nav-menu--dropdown-none elementor-widget elementor-widget-nav-menu\" data-id=\"c981917\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;layout&quot;:&quot;vertical&quot;,&quot;submenu_icon&quot;:{&quot;value&quot;:&quot;&lt;svg aria-hidden=\\&quot;true\\&quot; class=\\&quot;e-font-icon-svg e-fas-caret-down\\&quot; viewBox=\\&quot;0 0 320 512\\&quot; xmlns=\\&quot;http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\&quot;&gt;&lt;path d=\\&quot;M31.3 192h257.3c17.8 0 26.7 21.5 14.1 34.1L174.1 354.8c-7.8 7.8-20.5 7.8-28.3 0L17.2 226.1C4.6 213.5 13.5 192 31.3 192z\\&quot;&gt;&lt;\\\/path&gt;&lt;\\\/svg&gt;&quot;,&quot;library&quot;:&quot;fa-solid&quot;}}\" data-widget_type=\"nav-menu.default\">\n\t\t\t\t\t\t\t\t<nav aria-label=\"\u30e1\u30cb\u30e5\u30fc\" class=\"elementor-nav-menu--main elementor-nav-menu__container elementor-nav-menu--layout-vertical e--pointer-none\">\n\t\t\t\t<ul id=\"menu-1-c981917\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2521\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/signs-and-symptoms\/\" class=\"elementor-item\">Signs and Symptoms<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2522\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/the-stages-of-breast-cancer\/\" class=\"elementor-item\">The Stages of Breast Cancer<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2523\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/tumor-size-and-staging\/\" class=\"elementor-item\">Tumor Size and Staging<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2520\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/metastases-and-staging\/\" class=\"elementor-item\">Metastases and Staging<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2519\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/early-stage-breast-cancers-non-invasive\/\" class=\"elementor-item\">Early-Stage Breast Cancers (Non-invasive)<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<nav class=\"elementor-nav-menu--dropdown elementor-nav-menu__container\" aria-hidden=\"true\">\n\t\t\t\t<ul id=\"menu-2-c981917\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2521\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/signs-and-symptoms\/\" class=\"elementor-item\" tabindex=\"-1\">Signs and Symptoms<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2522\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/the-stages-of-breast-cancer\/\" class=\"elementor-item\" tabindex=\"-1\">The Stages of Breast Cancer<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2523\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/tumor-size-and-staging\/\" class=\"elementor-item\" tabindex=\"-1\">Tumor Size and Staging<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2520\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/metastases-and-staging\/\" class=\"elementor-item\" tabindex=\"-1\">Metastases and Staging<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2519\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/early-stage-breast-cancers-non-invasive\/\" class=\"elementor-item\" tabindex=\"-1\">Early-Stage Breast Cancers (Non-invasive)<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2330\" class=\"elementor-element elementor-element-dd578e0 e-con-full e-flex e-con e-child\" data-id=\"dd578e0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6342a8d elementor-widget elementor-widget-heading\" data-id=\"6342a8d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Risk Factors &amp; Genetics<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-857c29f elementor-nav-menu--dropdown-none elementor-widget elementor-widget-nav-menu\" data-id=\"857c29f\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;layout&quot;:&quot;vertical&quot;,&quot;submenu_icon&quot;:{&quot;value&quot;:&quot;&lt;svg aria-hidden=\\&quot;true\\&quot; class=\\&quot;e-font-icon-svg e-fas-caret-down\\&quot; viewBox=\\&quot;0 0 320 512\\&quot; xmlns=\\&quot;http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\&quot;&gt;&lt;path d=\\&quot;M31.3 192h257.3c17.8 0 26.7 21.5 14.1 34.1L174.1 354.8c-7.8 7.8-20.5 7.8-28.3 0L17.2 226.1C4.6 213.5 13.5 192 31.3 192z\\&quot;&gt;&lt;\\\/path&gt;&lt;\\\/svg&gt;&quot;,&quot;library&quot;:&quot;fa-solid&quot;}}\" data-widget_type=\"nav-menu.default\">\n\t\t\t\t\t\t\t\t<nav aria-label=\"\u30e1\u30cb\u30e5\u30fc\" class=\"elementor-nav-menu--main elementor-nav-menu__container elementor-nav-menu--layout-vertical e--pointer-none\">\n\t\t\t\t<ul id=\"menu-1-857c29f\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2525\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/brca1-and-brca2-mutations-in-men\/\" class=\"elementor-item\">BRCA1 and BRCA2 Mutations in Men<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2526\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/brca1-and-brca2-mutations-in-women\/\" class=\"elementor-item\">BRCA1 and BRCA2 Mutations in Women<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2528\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/lobular-carcinoma-in-situ-lcis\/\" class=\"elementor-item\">Lobular Carcinoma in Situ (LCIS)<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2527\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/early-life-exposures\/\" class=\"elementor-item\">Early Life Exposures<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<nav class=\"elementor-nav-menu--dropdown elementor-nav-menu__container\" aria-hidden=\"true\">\n\t\t\t\t<ul id=\"menu-2-857c29f\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2525\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/brca1-and-brca2-mutations-in-men\/\" class=\"elementor-item\" tabindex=\"-1\">BRCA1 and BRCA2 Mutations in Men<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2526\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/brca1-and-brca2-mutations-in-women\/\" class=\"elementor-item\" tabindex=\"-1\">BRCA1 and BRCA2 Mutations in Women<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2528\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/lobular-carcinoma-in-situ-lcis\/\" class=\"elementor-item\" tabindex=\"-1\">Lobular Carcinoma in Situ (LCIS)<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2527\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/early-life-exposures\/\" class=\"elementor-item\" tabindex=\"-1\">Early Life Exposures<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2330\" class=\"elementor-element elementor-element-8382bf4 e-con-full e-flex e-con e-child\" data-id=\"8382bf4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f24ff62 elementor-widget elementor-widget-heading\" data-id=\"f24ff62\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Benign Breast Conditions<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e396cf6 elementor-nav-menu--dropdown-none elementor-widget elementor-widget-nav-menu\" data-id=\"e396cf6\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;layout&quot;:&quot;vertical&quot;,&quot;submenu_icon&quot;:{&quot;value&quot;:&quot;&lt;svg aria-hidden=\\&quot;true\\&quot; class=\\&quot;e-font-icon-svg e-fas-caret-down\\&quot; viewBox=\\&quot;0 0 320 512\\&quot; xmlns=\\&quot;http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\&quot;&gt;&lt;path d=\\&quot;M31.3 192h257.3c17.8 0 26.7 21.5 14.1 34.1L174.1 354.8c-7.8 7.8-20.5 7.8-28.3 0L17.2 226.1C4.6 213.5 13.5 192 31.3 192z\\&quot;&gt;&lt;\\\/path&gt;&lt;\\\/svg&gt;&quot;,&quot;library&quot;:&quot;fa-solid&quot;}}\" data-widget_type=\"nav-menu.default\">\n\t\t\t\t\t\t\t\t<nav aria-label=\"\u30e1\u30cb\u30e5\u30fc\" class=\"elementor-nav-menu--main elementor-nav-menu__container elementor-nav-menu--layout-vertical e--pointer-none\">\n\t\t\t\t<ul id=\"menu-1-e396cf6\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-7721\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/chemo-side-effects\/\" class=\"elementor-item\">Chemo side effects<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2529\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/patient-faq\/\" class=\"elementor-item\">Patient FAQ<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<nav class=\"elementor-nav-menu--dropdown elementor-nav-menu__container\" aria-hidden=\"true\">\n\t\t\t\t<ul id=\"menu-2-e396cf6\" class=\"elementor-nav-menu sm-vertical\"><li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-7721\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/chemo-side-effects\/\" class=\"elementor-item\" tabindex=\"-1\">Chemo side effects<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2529\"><a href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/patient-faq\/\" class=\"elementor-item\" tabindex=\"-1\">Patient FAQ<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7b0f4e8 e-con-full e-flex e-con e-child\" data-id=\"7b0f4e8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1a2fcb3 elementor-widget elementor-widget-heading\" data-id=\"1a2fcb3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Lobular Carcinoma in Situ (LCIS)<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-da37b97 elementor-widget elementor-widget-text-editor\" data-id=\"da37b97\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Lobular Carcinoma in Situ (LCIS) is not breast cancer<\/strong>, but it <strong>does increase a person\u2019s risk of developing breast cancer in the future<\/strong>. LCIS is best described as a <strong>marker of increased risk<\/strong>, rather than a disease that needs cancer treatment.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f348c4a elementor-widget elementor-widget-image\" data-id=\"f348c4a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/rftcjapan.org\/wpdata\/wp-content\/uploads\/2026\/02\/graphic-LCIS.svg\" class=\"attachment-large size-large wp-image-7411\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-62dfd5b e-con-full e-flex e-con e-child\" data-id=\"62dfd5b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a778579 elementor-widget elementor-widget-heading\" data-id=\"a778579\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What Is LCIS?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-19201d9 color-bullet-list elementor-widget elementor-widget-text-editor\" data-id=\"19201d9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>LCIS occurs when <strong>abnormal cells grow in the milk-producing glands (lobules) of the breast.<\/strong> Despite its name, LCIS:<\/p><ul><li>Is <strong>not invasive<\/strong><\/li><li>Does <strong>not spread<\/strong> beyond the lobules<\/li><li>Is<strong> not life-threatening<\/strong><\/li><li>Usually causes <strong>no symptoms<\/strong><\/li><\/ul><p>LCIS is often found <strong style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';\">incidentally<\/strong><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';\"> during a biopsy performed for another reason, such as a mammogram finding or a benign breast lump.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2e5de36 e-con-full e-flex e-con e-child\" data-id=\"2e5de36\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-39f71ac elementor-widget elementor-widget-heading\" data-id=\"39f71ac\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How Does LCIS Affect Breast Cancer Risk?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d451824 color-bullet-list elementor-widget elementor-widget-text-editor\" data-id=\"d451824\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>While LCIS is not a disease that requires cancer treatment, it does <strong>increase a patient\u2019s lifetime risk of developing breast cancer.<\/strong><\/p><p>Importantly, LCIS itself <strong>does not turn into cancer<\/strong>, but it signals that the breast tissue is more susceptible to cancer development over time.<\/p><ul><li>People with LCIS are estimated to have a <strong>7\u201312 times higher risk<\/strong> of developing breast cancer compared to the general population.<\/li><li>The increased risk applies to <strong>both breasts<\/strong>, not just the breast where LCIS was found.<\/li><li>LCIS can increase the risk of <strong>both invasive ductal cancer and invasive lobular cancer.<\/strong><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-da36f57 e-con-full e-flex e-con e-child\" data-id=\"da36f57\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-152b2de elementor-widget elementor-widget-heading\" data-id=\"152b2de\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Who Is Most Commonly Diagnosed With LCIS?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-10ec462 color-bullet-list elementor-widget elementor-widget-text-editor\" data-id=\"10ec462\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>LCIS is most often diagnosed in:<\/p><ul><li>Women between the ages of 40 and 60<\/li><li>Individuals undergoing breast biopsies for abnormal imaging<\/li><li>People with additional risk factors, such as:<ul><li>A family history of breast cancer<\/li><li>Dense breast tissue<\/li><li>Hormonal or reproductive risk factors<\/li><\/ul><\/li><\/ul><p>LCIS can also occur in men, though this is rarer.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9ce830a e-con-full e-flex e-con e-child\" data-id=\"9ce830a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-802b1f9 elementor-widget elementor-widget-heading\" data-id=\"802b1f9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How Is LCIS Managed?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bfa17a4 color-bullet-list elementor-widget elementor-widget-text-editor\" data-id=\"bfa17a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Because LCIS is <strong>not cancer<\/strong>, treatment usually focuses on <strong>risk reduction and careful monitoring<\/strong>, rather than surgery or chemotherapy.<\/p><p>Management may include:<\/p><ul><li><strong>Regular breast screening<\/strong>, such as annual mammograms<\/li><li><strong>Breast MRIs<\/strong>, for some higher-risk individuals<\/li><li><strong>Clinical breast exams<\/strong> at regular intervals<\/li><li><strong>Risk-reducing medications<\/strong> (such as hormone-blocking therapy) for some patients<\/li><li><strong>Lifestyle modifications<\/strong>, including maintaining a healthy weight and limiting alcohol<\/li><\/ul><p>Preventive surgery is rarely recommended and is reserved only for people with a very high overall risk.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c46cc6f e-con-full e-flex e-con e-child\" data-id=\"c46cc6f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d56af0f elementor-widget elementor-widget-heading\" data-id=\"d56af0f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why Ongoing Monitoring Matters<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a3fe1d2 color-bullet-list elementor-widget elementor-widget-text-editor\" data-id=\"a3fe1d2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>LCIS is often referred to as a \u201c<strong>warning sign<\/strong>\u201d rather than a diagnosis. With appropriate follow-up:<\/p><ul><li>Breast cancer can often be <strong>detected at an early, highly treatable stage<\/strong><\/li><li>Many people with LCIS <strong>never develop breast cancer<\/strong><\/li><li>In general, long-term outcomes are <strong>excellent<\/strong><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b40480d e-con-full e-flex e-con e-child\" data-id=\"b40480d\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-b6fe23d e-con-full section-s e-flex e-con e-child\" data-id=\"b6fe23d\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-f14ca54 e-con-full e-flex e-con e-child\" data-id=\"f14ca54\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b29c0d0 elementor-widget elementor-widget-heading\" data-id=\"b29c0d0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h5 class=\"elementor-heading-title elementor-size-default\">A Closing Message<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62aefb3 elementor-widget elementor-widget-heading\" data-id=\"62aefb3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Being diagnosed with LCIS can sound frightening, but it is important to remember:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ae28299 color-bullet-list elementor-widget elementor-widget-text-editor\" data-id=\"ae28299\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li>LCIS is not breast cancer<\/li><li>It does not require cancer treatment<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3ef0da5 elementor-absolute elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"3ef0da5\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<div class=\"elementor-icon\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-bookmark\" viewBox=\"0 0 384 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M0 512V48C0 21.49 21.49 0 48 0h288c26.51 0 48 21.49 48 48v464L192 400 0 512z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Table of Contents About Breast Cancer Lobular Carcinoma in Situ (LCIS) is not breast cancer, but it does increase a person\u2019s risk of developing breast cancer in the future. LCIS is best described as a marker of increased risk, rather than a disease that needs cancer treatment. What Is LCIS? LCIS occurs when abnormal cells [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":27,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1872","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lobular Carcinoma in Situ (LCIS) - RFTC Japan<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/lobular-carcinoma-in-situ-lcis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lobular Carcinoma in Situ (LCIS) - RFTC Japan\" \/>\n<meta property=\"og:description\" content=\"Table of Contents About Breast Cancer Lobular Carcinoma in Situ (LCIS) is not breast cancer, but it does increase a person\u2019s risk of developing breast cancer in the future. LCIS is best described as a marker of increased risk, rather than a disease that needs cancer treatment. What Is LCIS? LCIS occurs when abnormal cells [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/lobular-carcinoma-in-situ-lcis\/\" \/>\n<meta property=\"og:site_name\" content=\"RFTC Japan\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-27T05:51:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/rftcjapan.org\/wpdata\/wp-content\/uploads\/2026\/02\/graphic-LCIS.svg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"28 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/rftcjapan.org\\\/en\\\/about-breast-cancer\\\/lobular-carcinoma-in-situ-lcis\\\/\",\"url\":\"https:\\\/\\\/rftcjapan.org\\\/en\\\/about-breast-cancer\\\/lobular-carcinoma-in-situ-lcis\\\/\",\"name\":\"Lobular Carcinoma in Situ (LCIS) - RFTC Japan\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/rftcjapan.org\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/rftcjapan.org\\\/en\\\/about-breast-cancer\\\/lobular-carcinoma-in-situ-lcis\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/rftcjapan.org\\\/en\\\/about-breast-cancer\\\/lobular-carcinoma-in-situ-lcis\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/rftcjapan.org\\\/wpdata\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/graphic-LCIS.svg\",\"datePublished\":\"2026-02-07T10:51:13+00:00\",\"dateModified\":\"2026-02-27T05:51:13+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/rftcjapan.org\\\/en\\\/about-breast-cancer\\\/lobular-carcinoma-in-situ-lcis\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/rftcjapan.org\\\/en\\\/about-breast-cancer\\\/lobular-carcinoma-in-situ-lcis\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/rftcjapan.org\\\/en\\\/about-breast-cancer\\\/lobular-carcinoma-in-situ-lcis\\\/#primaryimage\",\"url\":\"https:\\\/\\\/rftcjapan.org\\\/wpdata\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/graphic-LCIS.svg\",\"contentUrl\":\"https:\\\/\\\/rftcjapan.org\\\/wpdata\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/graphic-LCIS.svg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/rftcjapan.org\\\/en\\\/about-breast-cancer\\\/lobular-carcinoma-in-situ-lcis\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/rftcjapan.org\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"About Breast Cancer\",\"item\":\"https:\\\/\\\/rftcjapan.org\\\/%e4%b9%b3%e3%81%8c%e3%82%93%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Lobular Carcinoma in Situ (LCIS)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/rftcjapan.org\\\/#website\",\"url\":\"https:\\\/\\\/rftcjapan.org\\\/\",\"name\":\"RFTC Japan\",\"description\":\"Japan&#039;s Leading Breast Cancer Foundation\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/rftcjapan.org\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Lobular Carcinoma in Situ (LCIS) - RFTC Japan","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/rftcjapan.org\/en\/about-breast-cancer\/lobular-carcinoma-in-situ-lcis\/","og_locale":"en_US","og_type":"article","og_title":"Lobular Carcinoma in Situ (LCIS) - RFTC Japan","og_description":"Table of Contents About Breast Cancer Lobular Carcinoma in Situ (LCIS) is not breast cancer, but it does increase a person\u2019s risk of developing breast cancer in the future. LCIS is best described as a marker of increased risk, rather than a disease that needs cancer treatment. What Is LCIS? 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