Abstract OT2-04-01: Phase III trial to determine if chest wall and regional nodal radiotherapy (CWRNRT) post mastectomy (Mx) or the addition of RNRT to whole breast RT post breast-conserving surgery (BCS) reduces invasive breast cancer recurrence-free interval (IBCR-FI) in patients (pts) with pathologically positive axillary (PPAx) nodes who are ypN0 after neoadjuvant chemotherapy (NC): NRG Oncology/NSABP B-51/RTOG 1304

Abstract Background Electrochemotherapy has been shown to be safe, effective and non-invasive loco-regional treatment for chest wall breast cancer recurrence. Electrochemotherapy is the gold standard treatment of patients with cutaneous metastases from breast cancer who due to the extent of those lesions are not eligible for resection or radiotherapy has already been used, and systemic therapy is ineffective or contraindicated. Case presentation Here we present the case of a women affected by multiple metastatic cancers with multi-drug resistance who refused mastectomy after being diagnosed with recurrent ulcerated right breast cancer. We first describe an extended indication to electrochemotherapy to treat breast cancer recurrence after breast conserving surgery. Electroporation-induced necrosis through electrochemotherapy replaced surgery and was delivered in 30 minutes at 5000 Hz frequencies at 730 V by hexagonal needle under general anesthesia. The necrosis of the remaining breast resulted in a voluminous eschar that was easily removed few months after leaving the chest wall free from macroscopic disease turning in a non-surgical mastectomy. Conclusions. This kind of breakthrough application of electrochemotherapy might be considered to avoid palliative mastectomy in very selected patients. New technologies may help clinicians to find agreement between patient’ will and the burden of treatment and might contribute in selected cases to give options to patients not keen on having surgery.

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Association of CYP2D6 genotype and tamoxifen metabolites with breast cancer recurrence in a low-dose trial

npj Breast Cancer ◽

10.1038/s41523-021-00236-6 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Andrea DeCensi ◽

Harriet Johansson ◽

Thomas Helland ◽

Matteo Puntoni ◽

Debora Macis ◽

...

Keyword(s):

Breast Cancer ◽

Low Dose ◽

Cancer Recurrence ◽

Phase Iii ◽

Cyp2d6 Genotype ◽

Phase Iii Trial ◽

Reactive Protein ◽

Non Invasive ◽

Tamoxifen Metabolites ◽

Dose Trial

AbstractLow-dose tamoxifen halves recurrence in non-invasive breast cancer without significant adverse events. Some adjuvant trials with tamoxifen 20 mg/day had shown an association between low endoxifen levels (9–16 nM) and recurrence, but no association with CYP2D6 was shown in the NSABP P1 and P2 prevention trials. We studied the association of CYP2D6 genotype and tamoxifen metabolites with tumor biomarkers and recurrence in a randomized phase III trial of low-dose tamoxifen. Median (IQR) endoxifen levels at year 1 were 8.4 (5.3–11.4) in patients who recurred vs 7.5 (5.1–10.2) in those who did not recur (p = 0.60). Tamoxifen and metabolites significantly decreased C-reactive protein (CRP, p < 0.05), and a CRP increase after 3 years was associated with higher risk of recurrence (HR = 4.37, 95% CI, 1.14–16.73, P = 0.03). In conclusion, endoxifen is below 9 nM in most subjects treated with 5 mg/day despite strong efficacy and there is no association with recurrence, suggesting that the reason for tamoxifen failure is not poor drug metabolism. Trial registration: ClinicalTrials.gov, Identifier: NCT01357772.

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