Table 2.
Surgical and Radiation Treatment Characteristics of the Two Cohorts
| Characteristic | Prepectoral (N = 25)* | Subpectoral (N = 25)* | P † |
|---|---|---|---|
| Type of LEFT mastectomy performed | 0.7 | ||
| None | 4 (16%) | 3 (12%) | |
| Nipple-sparing mastectomy | 6 (24%) | 4 (16%) | |
| Skin-sparing mastectomy | 13 (52%) | 17 (68%) | |
| Modified radical mastectomy | 2 (8.0%) | 1 (4.0%) | |
| Type of RIGHT mastectomy performed | 0.6 | ||
| None | 5 (20%) | 8 (32%) | |
| Nipple-sparing mastectomy | 5 (20%) | 2 (8.0%) | |
| Skin-sparing mastectomy | 14 (56%) | 14 (56%) | |
| Modified radical mastectomy | 1 (4.0%) | 1 (4.0%) | |
| Laterality of reconstruction | 0.7 | ||
| Left | 5 (20%) | 8 (32%) | |
| Right | 4 (16%) | 3 (12%) | |
| Bilateral | 16 (64%) | 14 (56%) | |
| Acellular dermal matrix used | >0.9 | ||
| Yes | 20 (80%) | 21 (84%) | |
| No | 5 (20%) | 4 (16%) | |
| Ipsilateral tissue expander fill volume at time of radiation (cc) | 462 (164) | 477 (178) | 0.8 |
| Contralateral tissue expander fill volume at time of radiation (in cc), if relevant | 220 (122) | 346 (184) | 0.047 |
| Radiation laterality | >0.9 | ||
| Left | 12 (48%) | 12 (48%) | |
| Right | 13 (52%) | 13 (52%) | |
| Whole breast radiation dose (in Gray) | 0.3 | ||
| 42.56 | 1 (4.0%) | 4 (16%) | |
| 50 | 24 (96%) | 21 (84%) | |
| Chest wall boost given | 0.088 | ||
| Yes | 8 (32%) | 3 (12%) | |
| No | 17 (68%) | 22 (88%) | |
| Skin bolus given | >0.9 | ||
| Yes | 22 (88%) | 23 (92%) | |
| No | 3 (12%) | 2 (8%) | |
| Breath hold technique used | 0.2 | ||
| Yes | 24 (96%) | 20 (80%) | |
| No | 1 (4%) | 5 (10%) | |
| Pectoralis volume (in cm3) | 100 (30) | 121 (46) | 0.053 |
*
n (%); Mean (SD).
†
Fisher exact test; Welch Two Sample t test; Pearson chi-squared test