title: Implant breast reconstruction followed by radiotherapy: can helical tomotherapy become a standard irradiation treatment?
abstract: To evaluate the benefits and limitations of helical tomotherapy (HT) for loco-regional irradiation of patients after a mastectomy and immediate implant-based reconstruction. Ten breast cancer patients with retropectoral implants were randomly selected for this comparative study. Planning target volumes (PTVs) 1 (the volume between the skin and the implant, plus margin) and 2 (supraclavicular, infraclavicular, and internal mammary nodes, plus margin) were 50 Gy in 25 fractions using a standard technique and HT. The extracted dosimetric data were compared using a 2-tailed Wilcoxon matched-pair signed-rank test. Doses for PTV1 and PTV2 were significantly higher with HT (V95 of 98.91 and 97.91%, respectively) compared with the standard technique (77.46 and 72.91%, respectively). Similarly, the indexes of homogeneity were significantly greater with HT (p = 0.002). HT reduced ipsilateral lung volume that received ≥20 Gy (16.7 vs. 35%), and bilateral lungs (p = 0.01) and neighboring organs received doses that remained well below tolerance levels. The heart volume, which received 25 Gy, was negligible with both techniques. HT can achieve full target coverage while decreasing high doses to the heart and ipsilateral lung. However, the low doses to normal tissue volumes need to be reduced in future studies.
authors.affiliation: Department of Radiation Oncology, Institut Curie, Paris, France. cmassabeau@hotmail.com
authors.forename: Carole
authors.initials: C
authors.lastname: Massabeau
authors.forename: Nathalie
authors.initials: N
authors.lastname: Fournier-Bidoz
authors.forename: Georges
authors.initials: G
authors.lastname: Wakil
authors.forename: Pablo
authors.initials: P
authors.lastname: Castro Pena
authors.forename: Romain
authors.initials: R
authors.lastname: Viard
authors.forename: Sofia
authors.initials: S
authors.lastname: Zefkili
authors.forename: Fabien
authors.initials: F
authors.lastname: Reyal
authors.forename: François
authors.initials: F
authors.lastname: Campana
authors.forename: Alain
authors.initials: A
authors.lastname: Fourquet
authors.forename: Youlia M
authors.initials: YM
authors.lastname: Kirova
mesh_terms: D018427:Breast Implants; D001943:Breast Neoplasms / Q000628:therapy*; D003131:Combined Modality Therapy; D005260:Female; D006801:Humans; D016462:Mammaplasty / Q000295:instrumentation* / Q000379:methods; D011874:Radiometry / Q000379:methods*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D018714:Radiotherapy, Adjuvant / Q000379:methods; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*; D016896:Treatment Outcome