Higher Volume at Time of Breast Conserving Surgery Reduces Re-Excision in DCIS
Table 3
(a) Comparison of the average total volume of BCS and BCS-AM surgery relative to re-excision surgery.
Re-excision
No
Yes
P
Total
BCS
100.3 (n = 79)
77.8 (n = 122)
*.067
86.6 (n = 201)
BCS-AM
127.2 (n = 95)
98.7 (n = 56)
*.281
116.6 (n = 151)
Total
114.9 (n = 174)
79.6 (n = 178)
*.003
**<0.001
AM alone
26.3 (n = 95)
28.9 (n = 56)
*.444
24.6 (n = 151)
BCS-AM: all resected tissue, including additional margins. AM alone: volumes of additional margins taken with BCS for BCS-AM samples. The volumes of each category were compared relative to re-excision surgery using the P values from two-sample t-tests with unequal variances. value reflects difference between “yes” and “no” for each listed group. value reflects difference between “total BCS” and “total BCS-AM”.
(b) Comparison of average total volume (cm3) for BCS and BCS-AM surgery relative to re-excision surgery using data only from the positive and close margin (<1 mm ) cohort.
Re-excision
No
Yes
P
Total
BCS
81.5 (n = 19)
72.9 (n = 98)
.773
74.3 (n = 117)
BCS-AM
97.6 (n = 17)
100.961 (n = 44)
.907
100.0 (n = 61)
Total
89.0 (n = 36)
81.6 (n = 142)
.713*
83.1 (n = 178)
**< 0.079
*
P value reflects difference between “yes” and “no” for each listed group. **P value reflects difference between “total BCS” and “total BCS-AM”.
