biostudies-literatureKim SCNRFSNUHKorean Cell Line Research FoundationNational Research Foundation of KoreaSeoul National University Hospitale2103360https://www.ebi.ac.uk/biostudies/studies/S-EPMC8844556biostudies-literatureUnknown9(5)Intratumor heterogeneity (ITH) stands as one of the main difficulties in the treatment of colorectal cancer (CRC) as it causes the development of resistant clones and leads to heterogeneous drug responses. Here, 12 sets of patient-derived organoids (PDOs) and cell lines (PDCs) isolated from multiple regions of single tumors from 12 patients, capturing ITH by multiregion sampling of individual tumors, are presented. Whole-exome sequencing and RNA sequencing of the 12 sets are performed. The PDOs and PDCs of the 12 sets are also analyzed with a clinically relevant 24-compound library to assess their drug responses. The results reveal unexpectedly widespread subregional heterogeneity among PDOs and PDCs isolated from a single tumor, which is manifested by genetic and transcriptional heterogenAdvanced science (Weinheim, Baden-Wurttemberg, Germany)Multifocal Organoid Capturing of Colon Cancer Reveals Pervasive Intratumoral Heterogenous Drug Responses.PMC88445562021M3H9A103015104-2017-06002020M3A9I6A0203606104‐2017‐0600Seo HYPark JWKim SCPark JHLee JOKoo BKKim GHBae JMJeong SYKim MKu JLShin YKfalseMultifocal Organoid Capturing of Colon Cancer Reveals Pervasive Intratumoral Heterogenous Drug Responses.Intratumor heterogeneity (ITH) stands as one of the main difficulties in the treatment of colorectal cancer (CRC) as it causes the development of resistant clones and leads to heterogeneous drug responses. Here, 12 sets of patient-derived organoids (PDOs) and cell lines (PDCs) isolated from multiple regions of single tumors from 12 patients, capturing ITH by multiregion sampling of individual tumors, are presented. Whole-exome sequencing and RNA sequencing of the 12 sets are performed. The PDOs and PDCs of the 12 sets are also analyzed with a clinically relevant 24-compound library to assess their drug responses. The results reveal unexpectedly widespread subregional heterogeneity among PDOs and PDCs isolated from a single tumor, which is manifested by genetic and transcriptional heterogen2022-01-01T00:00:00Z2022 Feb2026-05-28T08:01:07.901Z2025-04-04T22:15:42.96ZS-EPMC88445563491849610.1002/advs.202103360