Primary radiotherapy for T4 breast cancer

Area of Science:

• Oncology
• Radiation Oncology
• Clinical Cancer Research

Background:

• T4 breast cancer presents a significant clinical challenge with historically poor prognoses.
• Radiotherapy is a cornerstone in managing locally advanced breast cancer.

Purpose of the Study:

• To evaluate the impact of modified radiotherapy fractionation and dosage on local control and survival in T4 breast cancer patients.
• To assess if increased radiation absorbed dose and daily fractionation improved outcomes compared to previous regimens.

Main Methods:

• Retrospective review of 193 female patients with T4N0-3M0 breast cancer treated with radiotherapy between 1978 and 1985.
• Analysis of survival and local control rates with a minimum follow-up of 36 months.
• Multivariate analysis to identify prognostic factors including tumor size, nodal status, inflammatory changes, and radiotherapy technique.

Main Results:

• Five-year actuarial survival was 27.1%, with a median survival of 29 months.
• Local control was achieved in 25.9% of patients.
• Increasing tumor size, advanced nodal status, and inflammatory changes negatively impacted survival. Four-field radiotherapy techniques showed better survival and local control rates than other methods. Radiation dose was not a significant variable.

Conclusions:

• Radiotherapy alone, even at 60 Gy, is insufficient for achieving durable local control in the majority of T4 breast cancer patients.
• Radiotherapy technique, rather than dose, appears to be a more significant factor influencing outcomes in this patient cohort.
• Further research into combined modality treatments is warranted for improving outcomes in T4 breast cancer.