In patients who underwent sphincter preserving surgery with toal mesorectal excision and diverting stoma after neoadjuvant chemoradiation therapy for rectal cancer, the inestigators would evaluate the effect of a biofeedback therpy before stoma closure on their anorectal function after stoma closure.

Inclusion Criteria:

• rectal cancer patients
• neoadjuvant chemoradiation therapy (+)
• sphincter saving surgery with total mesorectal excision (+)
• temporary loop stoma (+)
• adult who is 17 years or older
• patinet who aggree with our study
• if woman is childbearing age, her pregnancy test shoud be indentified 'negative'

Exclusion Criteria:

• patients who have been enrolled to other clinical studies related to this study
• patients who underwent diverting stoma before neoadjuvant chemoradiation
• temporary end -ostomy (+)
• uncontrolled metabolic or systemic disease
• patients who do not understand the purpose of this study because of dementia or pshycologic problem
• MRSA or Clostridium difficille (+)
• Pregnant or during breast feeding
• serious complication after sphincter saving surgery

Rectal cancer patients who underwent sphincter saving surgery with total mesorectal excision and diverting stoma after neoadjuvant chemoradiation therapy.