BACKGROUND AND PURPOSE: In this study, we investigated whether cancer stem cell marker expressing cells can be identified that predict for the response of esophageal cancer (EC) to CRT. MATERIALS AND METHODS: EC cell-lines OE-33 and OE-21 were used to assess in vitro, stem cell activity, proliferative capacity and radiation response. Xenograft tumors were generated using NOD/SCID mice to assess in vivo proliferative capacity and tumor hypoxia. Archival and fresh EC biopsy tissue was used to confirm our in vitro and in vivo results. RESULTS: We showed that the CD44+/CD24- subpopulation of EC cells exerts a higher proliferation rate and sphere forming potential and is more radioresistant in vitro, when compared to unselected or CD44+/CD24+ cells. Moreover, CD44+/CD24- cells formed xenograft tumors faster and were often located in hypoxic tumor areas. In a study of archival pre-neoadjuvant CRT biopsy material from EC adenocarcinoma patients (N=27), this population could only be identified in 50% (9/18) of reduced-responders to neoadjuvant CRT, but never (0/9) in the complete responders (P=0.009). CONCLUSION: These results warrant further investigation into the possible clinical benefit of CD44+/CD24- as a predictive marker in EC patients for the response to chemoradiation.
BACKGROUND AND PURPOSE: In this study, we investigated whether cancer stem cell marker expressing cells can be identified that predict for the response of esophageal cancer (EC) to CRT. MATERIALS AND METHODS: EC cell-lines OE-33 and OE-21 were used to assess in vitro, stem cell activity, proliferative capacity and radiation response. Xenograft tumors were generated using NOD/SCIDmice to assess in vivo proliferative capacity and tumor hypoxia. Archival and fresh EC biopsy tissue was used to confirm our in vitro and in vivo results. RESULTS: We showed that the CD44+/CD24- subpopulation of EC cells exerts a higher proliferation rate and sphere forming potential and is more radioresistant in vitro, when compared to unselected or CD44+/CD24+ cells. Moreover, CD44+/CD24- cells formed xenograft tumors faster and were often located in hypoxic tumor areas. In a study of archival pre-neoadjuvant CRT biopsy material from EC adenocarcinomapatients (N=27), this population could only be identified in 50% (9/18) of reduced-responders to neoadjuvant CRT, but never (0/9) in the complete responders (P=0.009). CONCLUSION: These results warrant further investigation into the possible clinical benefit of CD44+/CD24- as a predictive marker in EC patients for the response to chemoradiation.
Authors: Nathan W Bronson; Brian S Diggs; Gene Bakis; Kenneth M Gatter; Brett C Sheppard; John G Hunter; James P Dolan Journal: J Gastrointest Surg Date: 2015-09-22 Impact factor: 3.452
Authors: Michalis Mastri; Swathi Ramakrishnan; Shruti D Shah; Ellen Karasik; Bryan M Gillard; Michael T Moser; Bailey K Farmer; Gissou Azabdaftari; Gurkamal S Chatta; Anna Woloszynska; Kevin H Eng; Barbara A Foster; Wendy J Huss Journal: Am J Clin Exp Urol Date: 2021-12-15