J Breast Cancer.  2016 Sep;19(3):283-291. 10.4048/jbc.2016.19.3.283.

Increased Incidence of Breast Cancer in Postmenopausal Women with High Body Mass Index at the Modena Screening Program

• Sebastiani F
• Cortesi L
• Sant M
• Lucarini V
• Cirilli C
• De Matteis E
• Marchi I
• Negri R
• Gallo E
• Federico M

• KMID: 2413953
• DOI: http://doi.org/10.4048/jbc.2016.19.3.283

Abstract

PURPOSE
We conducted a study to evaluate the relationship between body mass index (BMI) and the risk of breast cancer (BC) and outcome in a population of 14,684 women aged 55 to 69 years eligible to participate in the Mammography Screening Program (MSP) in the Province of Modena, Italy.
METHODS
The study population was drawn from women who underwent mammography screening between 2004 and 2006 in the Province of Modena. Women were subdivided into obese, overweight, and normal-weight categories according to BMI and followed until July 31, 2010, to evaluate the BC incidence. The clinicopathological characteristics of BC were also evaluated in different groups of patients classified according to BMI. After BC diagnosis, patients were followed for a median period of 65 (range, 2-104) months. Second events (recurrences and second tumors) were recorded, and the 5-year event-free survival (EFS) was calculated.
RESULTS
After a period of 73 months, 366 cases of BC were diagnosed. Compared with normal-weight women, obese women had a significantly higher incidence of BC (relative risk [RR], 1.32; p=0.040) (RR=1), larger tumors (27% of tumors were larger than T2 size), and more nodal involvement (38.5% of tumors were node-positive). Furthermore, a significantly higher rate of total events was seen in obese women compared with overweight and normal-weight patients, respectively (17.9% vs. 11.4% vs. 10.8%, p=0.032). The 5-year EFS was 89.0%, 89.0%, and 80.0% for normal-weight, overweight, and obese patients, respectively.
CONCLUSION
We observed a significantly higher risk of BC in obese women among those eligible to participate in the MSP in the Province of Modena. Finally, obese women had more second events and poorer EFS compared to nono bese women.

Keyword

Body mass index; Breast neoplasms; Mammography; Mass screening; Outcome assessment

MeSH Terms

Body Mass Index*
Breast Neoplasms*
Breast*
Diagnosis
Disease-Free Survival
Female
Humans
Incidence*
Italy
Mammography
Mass Screening*
Overweight

Figure

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  Figure 1 Flow-chart of the study.

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  Figure 2 Five-year event-free survival (EFS) among obese, overweight and normal-weight women. EFS for normal weight (blue line) and overweight (green line) patients was equal to 89.0%. Patients with obesity (red line) had and EFS of 80.0% (p=0.2).

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