From: Accelerated Partial Breast Irradiation (APBI): A review of available techniques

Trial | Trial Design | N | Inclusion | Control Arm | APBI technique (Experimental Arm) | Status |
---|---|---|---|---|---|---|

TARGIT [123] | Equivalence | 2232 | ≥ 45 years T1 small T2, N0, 1, Ductal | WBI as per institutional guidelines | IORT, Low energy X-rays 50 KV, 20 Gy/1 fraction | Started March 2000, completed enrollment march 2010 |

ELIOT [115] | Equivalence | 824 | ≥ 48 years invasive carcinoma T ≤ 2.5 cm, pN0, Quadrantectomy | WBI, 50 Gy/25 fractions + optional 10 Gy Boost | IORT 21 Gy/1 fraction, electrons up to 9 MeV | Started in Dec 2000 |

GEC-ESTRO | Non-inferiority, non-irrelevant, 3% difference | 1170 | ≥ 40 years stages O-II ductal/lobular carcinoma T ≤ 3 cm, pNO-pNmi, margin ≥ 2 mm | WBI 50- 50.4 Gy/25-28 fractions + optional 10 Gy boost | MIB, 32 Gy/8 fractions HDR, 30.3 Gy/7 fractions HDR, 50 Gy PDR | Started 2004 |

NSABP/RTOG 0413 | Equivalence | 4300 | ≥ 18 years stage 0, I, II (T < 3 cm) DCIS or invasive adenocarcinoma, ≤ 3 nodes positive, Margin negative | WBI 50-50.4 Gy/25-28 fractions, optional 10- 16 Gy boost | MIB Mammosite 34 Gy/10 fractions (5-10 days) 3D EBCRT 38.5 Gy/10 fractions (5-10 days) | Started in 2005 (accrual now closed to low risk patients) |

RAPID | Equivalence | 2128 | ≥ 40 years DCIS or invasive carcinoma T< 3 cm, margin negative, node negative, not BRCA 1/BRCA 2 | WBI 42.5 Gy/16 fractions/22 days (small breast) 50 Gy/25 fractions/35 days (large breast plus optional boost 10 Gy/4-5 fractions | 3D CRT 38.5 Gy/10 fractions (5-8 days) Minimum daily fraction separation 6 -8 hours | Started in January 2006 |

IMPORT-LOW | Non-inferiority | 1935 | ≥ 50 years invasive adenocarcinoma (not lobular) T ≤ 3 cm, margin ≥ 2 mm, node negative | WBI 40 Gy/15 fractions/21 days | EBRT (IMRT) Arm 1 40 Gy/15 fractions to primary tumour region + 36 Gy/15 fractions to low risk region Arm 2 40 Gy/15 fractions to primary tumour region | Started in 2006 |

IRMA | Non-inferiority | n/a | ≥ 49 years pT1-2 (< 3 cm) invasive carcinoma pN0- N1 Margins ≥ 2 mm | WBI 45 Gy/18 fractions, or 50 Gy/25 fractions, or 50,4 Gy/28 fractions | 3D CRT 38.5 Gy total in 10 fractions (3.85 Gy per fraction), twice a day with an interval of at least 6 hours | Started in 2007 |