Patient age and preoperative breast MRI in women with breast cancer: biopsy and surgical implications.

BACKGROUND: The influence of patient age on multidisciplinary treatment planning after preoperative breast magnetic resonance imaging (MRI) and its influence on the surgical decision-making process are unclear. METHODS: We performed a retrospective review of 710 women with breast cancer who underwent preoperative MRI at our institution between January 2003 and December 2008. Analysis by patient age included the number of additional ipsilateral MRI findings, the number of biopsies recommended/performed, the number of additional cancers found, and the percentage of patients undergoing mastectomy. RESULTS: Of the 710 patients, 343 (48%) had additional ipsilateral MRI findings. After stratifying by age, the incidence of additional ipsilateral findings differed between decades (P = 0.004). However, fewer biopsies were recommended in older patients (P = 0.043). The number of women pursuing preoperative needle biopsy increased with age (P = 0.0018), while the incidence of a second focus of breast cancer did not change with age (P = 0.07). The mastectomy rate decreased from 65% in women younger than 50 to 40% in women older than 70 (P < 0.001). CONCLUSIONS: In the setting of newly diagnosed breast cancer, the value of MRI is not influenced by patient age, with at least 40% of women in all age groups having additional findings on MRI. Insisting on preoperative needle biopsy of additional findings may decrease mastectomy rates. Further study is needed to determine the reasons for the increased percentage of mastectomies in younger women.

Classification system for identifying women at risk for altered partial breast irradiation recommendations after breast magnetic resonance imaging.

PURPOSE: To study the utility of preoperative breast MRI for partial breast irradiation (PBI) patient selection, using multivariable analysis of significant risk factors to create a classification rule. METHODS AND MATERIALS: Between 2002 and 2009, 712 women with newly diagnosed breast cancer underwent preoperative bilateral breast MRI at Mayo Clinic Florida. Of this cohort, 566 were retrospectively deemed eligible for PBI according to the National Surgical Adjuvant Breast and Bowel Project Protocol B-39 inclusion criteria using physical examination, mammogram, and/or ultrasound. Magnetic resonance images were then reviewed to determine their impact on patient eligibility. The patient and tumor characteristics were evaluated to determine risk factors for altered PBI eligibility after MRI and to create a classification rule. RESULTS: Of the 566 patients initially eligible for PBI, 141 (25%) were found ineligible because of pathologically proven MRI findings. Magnetic resonance imaging detected additional ipsilateral breast cancer in 118 (21%). Of these, 62 (11%) had more extensive disease than originally noted before MRI, and 64 (11%) had multicentric disease. Contralateral breast cancer was detected in 28 (5%). Four characteristics were found to be significantly associated with PBI ineligibility after MRI on multivariable analysis: premenopausal status (P=.021), detection by palpation (P<.001), first-degree relative with a history of breast cancer (P=.033), and lobular histology (P=.002). Risk factors were assigned a score of 0-2. The risk of altered PBI eligibility from MRI based on number of risk factors was 0:18%; 1:22%; 2:42%; 3:65%. CONCLUSIONS: Preoperative bilateral breast MRI altered the PBI recommendations for 25% of women. Women who may undergo PBI should be considered for breast MRI, especially those with lobular histology or with 2 or more of the following risk factors: premenopausal, detection by palpation, and first-degree relative with a history of breast cancer.

The role of preoperative bilateral breast magnetic resonance imaging in patient selection for partial breast irradiation in ductal carcinoma in situ.

Purpose. Women with ductal carcinoma in situ (DCIS) are often candidates for breast-conserving therapy, and one option for radiation treatment is partial breast irradiation (PBI). This study evaluates the use of preoperative breast magnetic resonance imaging (MRI) for PBI selection in DCIS patients. Methods. Between 2002 and 2009, 136 women with newly diagnosed DCIS underwent a preoperative bilateral breast MRI at Mayo Clinic in Florida. One hundred seventeen women were deemed eligible for PBI by the NSABP B-39 (National Surgical Adjuvant Breast and Bowel Project, Protocol B-39) inclusion criteria using physical examination, mammogram, and/or ultrasound. MRIs were reviewed for their impact on patient eligibility, and findings were pathologically confirmed. Results. Of the 117 patients, 23 (20%) were found ineligible because of pathologically proven MRI findings. MRI detected additional ipsilateral breast cancer in 21 (18%) patients. Of these women, 15 (13%) had more extensive disease than originally noted before MRI, and 6 (5%) had multicentric disease in the ipsilateral breast. In addition, contralateral breast cancer was detected in 4 (4%). Conclusions. Preoperative breast MRI altered the PBI recommendations for 20% of women. Bilateral breast MRI should be an integral part of the preoperative evaluation of all patients with DCIS being considered for PBI.