Dosimetric Coverage of the External Anal Sphincter by 3-Dimensional Conformal Fields in Rectal Cancer Patients Receiving Neoadjuvant Chemoradiation: Implications for the Concept of Sphincter-Preserving Radiation Therapy

Table 1

Characteristics of the patients.

Characteristics	Number
Number of patients	64
Staging
T2N0	3
T2N1	2
T3N0	9
T3N1	45
T3N2	2
T4N0	2
T4N1	1
GTV to anal verge
Mean	4.1 cm
Range	−1 to 9 cm
RT dose
5040 cGy	55
5400 cGy	9