Study of Prone Accelerated Breast And Nodal IMRT

A recent Cochrane Collaboration Intervention Review has addressed the effects of altered fractionation size on women with early breast cancer who have undergone breast conservation surgery. Analysis of two prospective randomized trials that included 2644 women, selected based on tumor size less than five cm, negative pathological margin of excision and negative lymph nodes. No difference in clinical outcome was detected. The conclusion of the review is that the use of unconventional fractionation regimens (greater than 2 Gy per fraction) does not affect breast appearance or toxicity, and does not seem to affect local recurrence or five years survival rates.

After breast surgery and an adequate axillary dissection (i.e., at least 8 nodes retrieved in the axillary dissection specimen from level I and II) it is possible to identify patients with 1 - 5 positive nodes who require radiotherapy to both the indexed breast/chest wall and the draining nodal stations that the surgeon did not include in the traditional level I - II axillary dissection, i.e., level III and supraclavicular stations. We are proposing to test a new technique that extends prone set up to also include these lymph node regions. Limiting treatment to the supraclavicular fossa and level III axilla in patients with an adequately dissected axilla is supported by several published studies. Regional nodal recurrences are rare (occurring in 1 - 5%) in patients with early stage invasive breast cancer who have undergone breast conserving therapy. Several institutions choose to treat only the level III axilla and supraclavicular nodal stations in patients who have undergone surgical treatment of level I/II axilla. This technique was documented recently by Liengsawangwong, who utilized CT-delineated nodal stations to improve target coverage of SCV (Supra-Clavicular) and level III axillary nodes in patients who had undergone axillary level I/II dissection and were found to have positive lymph nodes.