Influence of body mass index on the frequency of lymphedema and other complications after surgery for breast cancerABSTRACT
Objective: this study assessed the influence of pre-operative body mass index (BMI) has upon lymphedema, scar tissue adhesion, pain, and heaviness in the upper limb at two years after surgery for breast cancer.
Methods: retrospective analysis of 631 medical records of women who underwent surgery for breast cancer and were referred to the Physiotherapy Program at Prof. Dr. José Aristodemo Pinotti Women's Hospital of the Center for Integral Women's Health Care, CAISM/UNICAMP between January 2006 and December 2007.
Results: mean age of women was 56.5 years (±13.7 years) and the most part (55%) were overweight or obese, surgical stages II and III were present in 63% of women studied. Radical mastectomy was the most frequent surgery (54.4%), followed by quadrantectomy (32.1%). In the first year after surgery, there was no significant association between BMI categories and incidence of scar tissue adhesion, pain, heaviness and lymphedema. In the second year, overweight and obese women had higher rates of heaviness in the upper limb and lymphedema. For lymphedema, there was a significant difference among BMI categories (p=0.0268). Obese women are 3.6 times more likely to develop lymphedema in the second year after surgery (odds ratio 3.61 95% CI 1.36 to 9.41).
Conclusion: BMI ≥25kg/m2 prior to treatment for breast cancer can be considered a risk factor for developing lymphedema in the two years after surgery. There was no association between BMI and the development of other complications.
Keywords:
Breast Neoplasms/complications; Lymphedema; Body Mass Index; Risk Factors
RESUMO
Avaliou-se a influência do índice de massa corporal (IMC) pré-operatória na ocorrência de linfedema, aderência cicatricial, dor e peso no membro superior nos primeiros dois anos após cirurgia para câncer de mama. O estudo é uma análise retrospectiva, secundária de 631 prontuários de mulheres submetidas à cirurgia para câncer de mama e encaminhadas ao Programa de Fisioterapia do Hospital Professor Dr. José Aristodemo Pinotti do Centro de Atenção Integral à Saúde da Mulher, CAISM /UNICAMP, entre janeiro de 2006 e dezembro de 2007. Eram mulheres com idade média de 56,5 anos (±13,7 anos), a maioria (55%) com sobrepeso ou obesa. Os estádios clínicos II e III foram encontrados em 63% das mulheres. Mastectomia radical foi a cirurgia mais frequente (54,4%), seguida por quadrantectomia (32,1%). No primeiro ano após a cirurgia não houve associação significativa entre as categorias do índice de massa corporal e incidência de aderência cicatricial, dor, peso e linfedema. No segundo ano, mulheres com sobrepeso e obesidade apresentaram maiores taxas de peso no membro superior e linfedema. Para linfedema houve diferença significativa entre as categorias de índice de massa corporal (p=0,0268). Mulheres obesas têm 3,6 vezes mais chance de desenvolver linfedema no segundo ano após a cirurgia (odds ratio 3,61 95% IC 1,36-9,41). Concluiu-se que IMC ≥25kg/m2 anterior ao tratamento para câncer de mama pode ser considerado fator de risco para desenvolvimento do linfedema dois anos após a cirurgia. Não houve associação entre IMC e outras complicações.
Descritores:
Neoplasias da Mama/complicações; Linfedema; Índice de Massa Corporal; Fator de Risco
RESUMEN
Evaluación la influencia del índice de masa corporal preoperatorio, la aparición de linfedema, la adhesión de tejido cicatrizal, dolor y pesadez en los dos primeros años después de la cirugía para el cáncer de mama. Método: análisis retrospectivo de 631 historias clínicas de mujeres sometidas a cirugía para el cáncer de mama y encaminadas al Programa de Fisioterapia do Centro de Atención Integral de la Salud de la Mujer - Professor Dr. José Aristodemo Pinotti - CAISM /UNICAMP entre enero de 2006 y diciembre de 2007. Resultados: mujeres de mediana edad 56,5 años (±13,7 años), 55% tenían sobrepeso u obesidad. Etapas II y III del cáncer se encontraron en el 63% de las mujeres. Cirugía de mastectomía radical fue la más frecuente (54,4%), seguido de cuadrantectomía (32,1%). En el primer año después de la cirugía no hubo asociación significativa entre categorías de índice de masa corporal y incidencia de la adhesión del tejido de cicatriz, dolor, peso y linfedema. En el segundo año, sobrepeso y obesidad tenían mayores tasas de peso y linfedema. Para linfedema hubo diferencias significativas entre categorías de índice de masa corporal (p=0,0268). Las mujeres obesas tienen 3,6 veces más probabilidades de desarrollar linfedema en el segundo año después de la cirugía (odds ratio 3,61 IC del 95%: 1,36 a 9,41). La conclusión és índice de masa corporal ≥25kg/m2 antes del tratamiento para el cáncer de mama puede ser considerado un factor de riesgo para desarrollo de linfedema, dos años después de la cirugía. No hubo asociación entre el índice de masa corporal y otras complicaciones.
Palabras clave:
Neoplasias de la Mama/complicaciones, Linfedema; Índice de Masa Corporal; Factores de Riesgo
INTRODUCTION
Breast cancer is the most common cancer among women, with higher incidence in women between 50 and 60 years of age1. Early diagnosis, technological advances, more conservative surgery and new treatment modalities have increased the life expectancy of women with breast cancer. This improvement in life expectancy is contrasted with its impact on overall health, as breast cancer and its treatment can have a negative impact on women's lives2.
Breast alteration and arm disorders lead to lower quality of life3. Among the complications associated with breast cancer treatment, lymphedema is one of the most significant, with prevalence rates between 0 and 56%, which may increase over time4), (5. Diversity of diagnostic methods and follow-up time explain its wide range of occurrence.
Lymphedema is a chronic condition caused by the accumulation of protein-rich fluid in interstitial spaces. The diagnosis varies depending on the degree of limb swelling and other clinical signs and symptoms6. Although three quarters of women have symptoms within one to two years after surgery, onset may be insidious and risk is present for the rest of their lives7. Presently, there is no cure for lymphedema; as such, the identification of possible risk factors for this complication is paramount8.
Studies suggest that potential risk factors for developing lymphedema include radiation therapy, infection, axillary dissection, type of surgery, the number of lymph nodes removed and involved, and obesity. Even though it is not known whether these factors affect the severity of lymphedema6, obesity can be associated with increased chronic inflammation, fibrosis and adipose deposition9, therefore obese or overweight women are at higher risk for lymphedema. The purpose of this study was to investigate the influence of BMI of women who underwent survey with axillary dissection for breast cancer on the occurrence of lymphedema and other complications such as scar tissue adhesion, pain, and heaviness in the upper limb within two years after surgery.
METHODOLOGY
We performed a retrospective secondary analysis of the medical records of 707 women who underwent surgery for breast cancer and who were referred to the Physiotherapy Program of Prof. Dr. José Aristodemo Pinotti Women's Hospital of the Integral Healthcare Center, CAISM/UNICAMP between January 2006 and December 2007.
The original study was approved by the Research Ethics Committee of the School of Medicine of UNICAMP (no. 1096/2009). As this study employed medical record review, it was exempted from the requirements of patient consent.
To analyse the relationship between pre-operative BMI and postoperative complications, 631 medical records that had data on weight and height, enabled the calculation of BMI. These data were collected before surgery.
Women were classified according to BMI categories of the World Health Organization (WHO): underweight (<18.5 kg/m2), normal range (≥18.5 and ≤24.9 kg/m2), overweight (≥25 and ≤29.9 kg/m2) and obese (≥30kg/m2)10.
The postoperative complications analyzed were: dehiscence and scar tissue adhesion, pain (located in the arm, axilla or breast region), sensation of heaviness in the upper limb (UL) and lymphedema. The techniques used to identify scar defects were inspection and palpation, while arm circumference11 and palpation were used to identify lymphedema. Women's complaints of pain and heaviness in the UL were included in medical records.
Information about complications were collected from medical records at three time points after surgery: we sought information about dehiscence and scar tissue adhesion at the end of the fourth week, and information about adherence, pain and heaviness in the UL, as well as lymphedema in the first and second years after surgery.
A descriptive analysis was performed using means, standard deviation, and absolute and relative frequencies (% n) for epidemiological and clinical characteristics and for the presence of complications. To evaluate the association between BMI and postoperative complications, chi-square and Fisher exact tests were performed. p<0.05 was considered statistically significant and for variables with significant associations, odds ratios were calculated to assess the magnitude of association.
Rehabilitation Program
On the first day after surgery, a physical therapist guides women to perform three upper body exercises: flexion, abduction and shoulder rotation. At hospital discharge, women received a booklet with guidelines about care of the ipsilateral arm and instructions to perform the exercises at home. The women received also the referral to the Rehabilitation Program, which has multidisciplinary team (physical therapist, nurse, psychologist and social assistant). On the first month after the surgery, women performed active group exercises (constituted approximately 19 exercises for the upper limb, containing stretching, active exercise and relaxation)12, three times a week, lasting about an hour. At the end of the program, women are evaluated by a physical therapist and stimulated to nurse the ipsilateral upper limb.
RESULTS
Among the 707 medical records consulted, 513 (72.6%) were from patients that joined the Rehabilitation Program and 76 were excluded because they lacked weight and height data used to calculate BMI before surgery. Among the other 631 women, 36 were underweight, 206 were normal range, 213 were overweight and 176 were obese. Throughout the first and second years after surgery, occurred a reduction in follow up visits and outpatient physical therapy (Figure 1).
The mean age of women was 56.5 years (±13.7 years). The mean BMI (27.32 kg/m2) was considered above normal range, most women (55%) were overweight or obese (BMI>25 kg/m2) and sixty-three percent (63%) of women had surgical stage II and III. The most frequent surgery was radical mastectomy (54.4%), followed by quadrantectomy (32.1%) (Table 1).
The complications of dehiscence and scar tissue adhesion at the end of the fourth week after surgery were not significantly associated with any of the categories of preoperative BMI (Table 2).
During the first year after surgery, there were no significant differences between BMI categories and the frequency of scar tissue adhesion, pain, heaviness and lymphedema (Table 3).
There was no significant association between BMI categories and pain, scar tissue adhesion or heaviness in the upper limb, although in the second year after surgery the occurrence was lower in women with greater BMI. We observed that only the development of lymphedema had significant differences among categories of BMI (p=0.0268) (Table 4). Almost 40% of obese women who returned to follow up in the second year after surgery developed lymphedema (Table 4). Analysing this complication, we found that obese women are 3.6 times more likely to develop lymphedema in the second year after surgery (OR 3.61 95% CI 1.36 to 9.41) (data not shown in table).
DISCUSSION
Up to one year after surgery for breast cancer, the different categories of BMI were not related with increased risk of developing scar tissue or UL complications. However, when evaluating women 6 and 12 months after surgery for breast cancer, Kwan et al (2010) observed a predictive relationship between the emergence of one or more complications of UL, such as pain, lymphedema and functional impairment with loss of range of motion, and high BMI5. There are no studies in the literature that evaluate the influence of BMI on dehiscence, pain and tissue adhesion.
In the second year after surgery, women either overweight or obese had higher rates of lymphedema, while the other complications analyzed did not correlate with BMI. Among many factors associated with the development of lymphedema, surgery and radiotherapy are worth mentioning12. However, women who at diagnosis are obese or who gain weight after the onset of breast cancer may be at increased risk for lymphedema6), (8), (13), (14), (15), (16.
A study observed that women with BMI >30 kg/m2 had two-times greater risk for lymphedema and multivariate analysis revealed that women with this category of preoperative BMI had a 2.93 greater chance of developing lymphedema compared to those with BMI <25 kg/m2 (95% CI 1.03-8.31)7. The same was observed in a study of 997 women diagnosed with invasive breast cancer, of which 133 had lymphedema and were overweight at diagnosis of the disease with elevated risk for this complication (hazard ratio, 1.43, 95% CI, 0.88-2.31)5.
In agreement with the literature, this study demonstrated that at the end of the second year, almost 40% of obese women at follow up visit had lymphedema. As for heaviness in the UL reported by the patients, this number increased to 56%.
It is not completely clear whether increased BMI is a direct risk factor for the development of lymphedema and two possible explanations for the observed influence of obesity on the development of lymphedema are: (a) in survivors of breast cancer with damage to the lymphatic system, the additional demand created by increasing body fat mass causes an imbalance between the volume of fluid and the lymphatic transport capacity5), (8), (17; and (b) increased endocrine response, that is, increased secretion of peptides, may contribute to lymphedema and tissue inflammation of the limbs of women at risk18. Surgery may also need to be more extensive as a result of the presence of adipose tissue and therefore more destructive to the lymphatic system8.
Obesity may not be a direct risk factor for developing lymphedema, but may be a risk for infections, scarring disorders (delayed healing, seroma, and fat necrosis), lymphangitis and lymphatic obstruction19. According to Ahemed et al. (2011) diseases that affect circulation such as coronary artery disease, hypertension or diabetes mellitus may increase lymphedema or symptoms in the upper limbs. However, after adjustment for obesity, there are no associations individually or collectively with these comorbidities6.
There is little information about the determinants of lymph flow, and thus further studies on lymphatic drainage and impedance should be performed to accurately determine the precise pathogenesis of lymphedema in obesity7.
The diagnosis of advanced cancer seems to have an influence on the onset of lymphedema. It was observed in this study that more than 60% of women studied presented an advanced stage of cancer and lymphedema, a result consistent with literature. In prospective cohort study of 1287 women, 104 (8%) developed lymphedema, 475 (37%) presented arm symptoms without a diagnosis of lymphedema and 708 (55%) did not present lymphedema. It was observed that in addition to the signs of more advanced cancer (locally advanced or nodal didease) and their treatment (greater number of lymph nodes removed and chemotherapy), there are modifiable characteristics associated with behaviours that increased risk of lymphedema and related symptoms, in particular, obesity and poor general health status6.
Hayes et al. (2008) point out that a sedentary lifestyle (OR, 1.9, 95% CI, 0.6-5.5) is associated with higher risk of lymphedema20, on the other hand several studies point out that signs and symptoms did not increase with exercise21. Therefore, it is safe for women treated for breast cancer to engage in physical activity22.
A review on clinical trials concluded that carefully controlled physical activity does not alter the risk for occurrence or worsen the symptoms of lymphedema and may be a strategy to reduce obesity and improve women's overall health and quality of life when treated for breast cancer23.
The following may limit this study: the exclusion of 76 records that did not present weight and height data to calculate BMI, not all women adhere to the Rehabilitation Program, the number of different follow up visits, the evaluations made by different physical therapists and the retrospectively data collection, which made it difficult to obtain data relatied to adjuvant treatments.
This study shows that approach to preoperative patients with breast cancer should be focused on weight control. Moreover, implement strategies for late follow-up of these women in order to prevent lymphedema.
CONCLUSION
Women with BMI ≥25kg/m2 prior to surgery for breast cancer have a greater risk for developing lymphedema in the second year after surgery. The incidence of other complications such as pain, tissue adhesions, dehiscence, and heaviness in UL were not influenced by BMI.
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