Multidisciplinary management of breast cancer

Breast cancer, with an increasing incidence, is the most frequently diagnosed cancer in women worldwide. The treatments proposed, generally a combination of surgery, radiotherapy, chemotherapy, endocrine therapy and/or targeted therapy, are constantly improving, allowing a reduction in the mortality rate, but they are still causing many side effects, not only early but also late, which leads us to consider the post-cancer period as a chronic condition. Side effects, reviewed in this commentary, may affect physical functions, psychological status, social situation, body composition, well-being and quality of life of the patient. In view of the extent of these areas in which side effects of breast cancer and of its treatments can be found, the supportive care offered at the end of treatment need to be multidisciplinary. Different supportive care interventions may be proposed to the patients such as psychological and behavioral interventions, complementary therapies, diet interventions, physical activity/rehabilitation or also physiotherapy interventions for example, all having shown some beneficial effects in the literature. The benefits of these supportive care interventions are thereby already established and they are described in this article, but others studies will be needed to clearly define indications and most optimal modalities of application to reduce side effects and improve quality of life of patients.


Background
Because of its incidence, the incurred treatments and especially its multiple clinical and social consequences, breast cancer constitutes a real public health issue.
This cancer remains the most frequently diagnosed in women worldwide with, among others, 1 380 000 new cases reported in 2008 (23 % of all cancers) and its incidence continues to rise [1,2]. Different treatments may be proposed, generally a combination of surgery, radiotherapy, chemotherapy, endocrine therapy and/or targeted therapy. Their effectiveness is constantly increasing, allowing a reduction in mortality [3,4]. Thereby, between 1992 and 2002 for example, the death rate from breast cancer has decreased by 13,4 % in Europe for women of all ages and by 16,7 % for those aged 35 to 64 [5].
However, despite this progress, breast cancer and its treatments are still causing many psychological, physical, and social side effects, not only early but also late, which leads us to consider the post-cancer period as a chronic condition. In view of the extent of the areas in which side effects of breast cancer and of its treatments can be found, the supportive care offered during and at the end of treatment need to be multidisciplinary.
We will thus, in this paper, review the various treatmentrelated side effects and the different supportive care interventions aiming to improve them.

Main text
Side effects of breast cancer and of its treatments Surgery Surgery, including radical mastectomy and lumpectomy, associated or not with axillary dissection, remains the centerpiece of breast cancer treatments [6]. Although the techniques continue to improve, various side effects can be observed. The most common complication encountered directly after breast surgery is wound infection, with an incidence of 4,34 % 30 days after radical mastectomy and 1,97 % after lumpectomy with axillary dissection [7]. Cardiac and pulmonary complications are uncommon with a rate of 0,12 % after mastectomy and 0,66 % after lumpectomy and axillary dissection [7]. Similarly, central nervous system complications are rare with rates of 0,12 and 0,07 % respectively and the urinary tract infection rates are 0,66 and 0,14 %, respectively [7]. Then, surgery remaining a mutilating action in the eyes of patients [6], the image of themselves may be impaired and particularly after radical mastectomy [8,9]. Similarly, sexual functioning [8,9] and role in society [9] also appear sometimes altered. Finally, surgery is also found responsible for fatigue and pain [10].
Axillary dissection can cause additional side effects including lymphedema, numbness, loss of strength and reduction of arm movement amplitude [8,[10][11][12] reducing the quality of life [8,12]. The incidence rate published for lymphedema varies between 2 % and 65 % depending on the surgical technique, the axillary sampling method and the use of chemotherapy and radiotherapy [13].

Chemotherapy
Chemotherapy is an important systemic treatment in the management of breast cancer. Depending on the drugs administered to the patient, it can cause various side effects including asthenia [10,14,[18][19][20][21][22] which is the most common. Asthenia is, indeed, encountered in 70 to 100 % of patients during the course of chemotherapy [21,23], but also thereafter [18,19,21]. The intensity of fatigue appears stable during treatment [19,21] and 60 % of patients present a moderate to severe level of fatigue [23].

Endocrine therapy
Like other treatments, endocrine therapy may cause side effects consisting mainly in menopausal symptoms: vaginal dryness, hot flashes, dyspareunia, sleep disorders or decreased bone density and increased risk of bone fracture [10,14,17,26]. Endocrine therapy may also cause pain, fatigue, an increase in body weight and vasomotor symptoms [10,14]. Other gynecological and sexual problems are also observed: vaginal discharge, mucosal atrophy, loss of libido and dyspareunia [10,28].
In summary, therapy of breast cancer and outcome is improving but side effects are still frequent and are best managed by a multidisciplinary team.

Supportive care
Supportive care aim to improve the quality of life of the patient by different interventions including symptom control, psychological and social supports, physical rehabilitation, educational needs and sometimes the end of life care, which requires a multidisciplinary cooperation and coordination [33][34][35].
Thus, to meet the patient's needs, we will discuss different supportive care interventions that can provide help and support and which have already been evaluated in several clinical.

Diet intervention
Overweight or obesity at the time of diagnosis is a poor prognosis factor and may be associated with a variety of undesirable outcomes such as an increase in the risk of recurrence and disease-specific or overall mortality [45][46][47][48]. Moreover, weight gain is a common side effect after chemotherapy [10,14,18,21,24] and/or endocrine therapy [10,14] and it seems to be the result of an increase in adipose tissue mass [45]. To prevent this weight gain and to improve food choices, the American Cancer Society wrote a report in which they discuss nutrition guidelines for cancer survivors [45]. According to this guideline, breast cancer survivors should try to maintain a healthy weight by eating a balanced diet and by practicing regular physical activity. Diets should emphasize vegetables and fruits, have low amounts of saturated fats and include sufficient dietary fiber [45,47]. Furthermore, other studies show the efficacy of in-person and telephone counseling/nutrition education in weight loss strategies and dietary improvement in women treated for breast cancer [48,49].

Physical activity/rehabilitation
To prevent weight gain, but also for its many beneficial effects on psychological and physical aspects, a regular physical activity is recommended for patients treated for breast cancer [10,37,50,51]. Inactivity should be avoided and daily activities should be resumed as soon as possible after surgery and during adjuvant cancer treatment [10,45,51]. More specifically, concerning aerobic training, 20 to 60 min of exercise at a moderate intensity (50-75 % of the maximal heart rate) are recommended 3 to 5 times per week [10,45,51,52]. For resistance training, it is recommended to follow a supervised program of approximately 2 to 3 sets of 8 to 15 repetitions with a very low load at baseline, 2 to 3 times a week. The resistance can be increased in small increments without any upper limit, but it is important to monitor the appearance of symptoms of the arm and/or shoulder such as a lymphedema and to reduce the resistance or stop the exercises according to the complications observed [10,45,52]. Finally, with regard to stretching, it is advisable to stretch the large muscle groups for 10 to 30 s 2 to 3 times per week [10,45].

Physiotherapy interventions
Lymphedema is a side effect often encountered as a result of breast cancer surgery and/or radiotherapy. The physiotherapist, with a manual lymphatic drainage associated with the implementation of compression bandages and/or compression therapy, skin care and remedial exercises, may help to reduce swelling, but also pain and heaviness [12,78]. Moreover, early physiotherapy interventions (including manual lymphatic drainage, massage of scar tissue, shoulder exercises, and educational strategy) also seem to be effective in the prevention of lymphedema [78].
Finally, all these interventions have shown in the literature the benefits they could bring as supportive care, but all should not always be prescribed to all patients. These supportive care modalities should be administered by qualified and experienced providers which take into account the risk-benefit ratio for each therapy, the patients' clinical characteristics (such as stage of disease, the overall goal of anticancer therapy, patient performance status and patient adherence), the communication with all health-care providers involved in the patient's care and also the patient preference [38].

Conclusions
Due to its high incidence and the side effects experienced as a result of the disease and its treatment, breast cancer constitutes a real public health problem and can be considered as a chronic condition. As side effects affect physical functions and the psychological status, social situation, body composition and well-being of the patient, a multidisciplinary and individualized supportive care is needed in addition to the anticancer therapy. The benefits of various supportive care interventions are already established, but studies are still needed to clearly determine the best modalities of application and the indications based on patient characteristics.