Abstract:
OBJECTIVES:Our aim was to assess FDG-PET/CT as a surrogate biomarker of the pathological complete response in locally advanced rectal cancer treated with neoadjuvant chemoradiation. METHODS:T3-4 and/or N+ rectal cancer patients were treated prospectively with capecitabine-based chemoradiation and total mesorectal excision 7-8 weeks later. FDG-PET/CT uptake was obtained at baseline, after 2 weeks, and 6 weeks following treatment completion, calculating the maximum standardized uptake value (SUV) and percentage difference to identify the early and late metabolic 'response index'. RESULTS:Thirty-one patients were treated from January 2009 to January 2012 at the Istituto Nazionale dei Tumori of Milan. One patient was excluded due to surgery refusal. The pathological complete response rate was 30%. Early FDG-PET/CT was performed in 24 consenting patients and failed to show predictive utility. On the contrary, significant differences in late SUV value and response index were observed between complete and noncomplete pathological responders (p = 0.0006 and 0.03). In multivariate analysis including most relevant SUV parameters, none of them was independently associated with a pathological complete response. With receiver operating characteristic curve analysis, a late SUV threshold <5.4 had 81% sensitivity and 100% specificity, with 90% overall accuracy. CONCLUSIONS:We evidenced a possible predictive role of late FDG-PET/CT for the assessment of pathological response in locally advanced rectal cancer following neoadjuvant chemoradiation.
journal_name
Oncologyjournal_title
Oncologyauthors
Bampo C,Alessi A,Fantini S,Bertarelli G,de Braud F,Bombardieri E,Valvo F,Crippa F,Di Bartolomeo M,Mariani L,Milione M,Biondani P,Avuzzi B,Chiruzzi C,Pietrantonio Fdoi
10.1159/000345601subject
Has Abstractpub_date
2013-01-01 00:00:00pages
191-9issue
4eissn
0030-2414issn
1423-0232pii
000345601journal_volume
84pub_type
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