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Distribution of residual cancer cells in the bowel wall after neoadjuvant chemoradiation in patients with rectal cancer.
MedLine Citation:
PMID:  23303141     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
BACKGROUND: : The standard treatment for locally advanced rectal cancer is preoperative cheimoradiation and total mesorectal excision. After surgery, tumors are classified according to the depth of tumor invasion, nodal involvement, and tumor regression grade. However, these staging systems do not provide information about the distribution of residual cancer cells within the bowel wall.
OBJECTIVE: : This study aimed to determine the distribution of residual cancer cells in each layer of the bowel wall in rectal cancer specimens.
DESIGN: : This was a secondary analysis of data from a prospective phase II study.
SETTING: : This study was performed in a multi-institutional setting.
PATIENTS: : Included were 153 patients with stage II or stage III rectal cancer.
INTERVENTIONS: : Patients were treated with chemoradiation and surgery. The surgical specimen tumor tissue was analyzed, and the distribution of residual cancer cells in each layer of the bowel wall was determined.
MAIN OUTCOME MEASURES: : Statistical analysis was used to examine the correlation of residual cancer cells in each layer of the bowel wall with the clinical/pathologic stage and tumor regression grade.
RESULTS: : Forty-two of 153 (27%) patients had complete response in the bowel wall (ypT0). Of the remaining 111 patients who had residual cancer cells, 5 (3%) were ypTis, 12 (8%) were ypT1, 41 (27%) were ypT2, 50 (33%) were ypT3, and 3 (2%) were ypT4. Of the 94 patients with ypT2-4 tumors, 12 (13%) had cancer cells in the mucosa, and 53 (56%) had cancer cells in the submucosa; 92 (98%) had cancer cells in the muscularis propria. Pretreatment cT correlated with the distribution of residual cancer cells. Tumor regression grade was not associated with the distribution of residual cancer cells after chemoradiation.
LIMITATIONS: : Patients received different chemotherapy regimens.
CONCLUSIONS: : Residual cancer cells in rectal cancer specimens after chemoradiation are preferentially located close to the invasive front. This should be considered when designing strategies to diagnose complete pathologic response and when investigating the mechanisms of tumor resistance to chemoradiation.
Authors:
Marjun P Duldulao; Wendy Lee; Leanne Streja; Peiguo Chu; Wenyan Li; Zhenbin Chen; Joseph Kim; Julio Garcia-Aguilar
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Diseases of the colon and rectum     Volume:  56     ISSN:  1530-0358     ISO Abbreviation:  Dis. Colon Rectum     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372764     Medline TA:  Dis Colon Rectum     Country:  United States    
Other Details:
Languages:  eng     Pagination:  142-9     Citation Subset:  IM    
Affiliation:
1 Department of General Oncologic Surgery, City of Hope Comprehensive Cancer Center, Duarte, California 2 Biostatistics, City of Hope Comprehensive Cancer Center, Duarte, California 3 Pathology, City of Hope Comprehensive Cancer Center, Duarte, California 4 Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York.
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