ESTRO meets Asia 2024 - Abstract Book

S76

Interdisciplinary – Breast

ESTRO meets Asia

Table 1. Pathology and IBTR Cohorts by Age (*Expected = 3.50% of patients in the group)

Observed IBTR- Invasive cancer patients

Expected* IBTR- Invasive cancer patients

Observed IBTR- DCIS patients

Expected* IBTR- DCIS patients

Invasive cancer patients

DCIS patients

All

cancer

Age (years)

patients

40 - 60

317

238

8.3

8

79

2.8

7

61 - 70

513

431

15.1

10

82

2.9

5

369

307

10.7

12

62

2.2

0

71+

Keywords: IORT, electronic brachytherapy, breast cancer

References:

1. Silverstein MJ, Epstein MS, Chen P, et al. Recurrence and Survival Rates for 1400 Early Stage Tumors Treated with Intraoperative Radiation Therapy (IORT). Ann Surg Onc. 2022;29(6):3726-3736. https://doi.org/10.1245/s10434-021-11295-1

120

Digital Poster

Chest Radiographs Predict the Benefit of MHD Reduction Using DIBH in Left Sided Breast Cancer

Tass Nitikornkul, Thongtra Nanna, Supaporn Srisuwan, Chuleeporn Jiarpinitnun,

Division of Radiation Oncology, Department of Radiology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand

Purpose/Objective:

To correlate the heart's parameters measured from CXR with the mean heart dose difference and to identify factors associated with a mean heart dose difference of ≥0.9 Gy when comparing Free-Breathing (FB) and DIBH techniques.

Material/Methods:

The retrospective study enrolled all female patients aged 18-70 diagnosed with left-sided breast cancer, who underwent either breast-conserving surgery or mastectomy and receive 3D conformal radiotherapy (3D-CRT)