INTRODUCTION
Overweight and obesity represent a risk factor for hormone dependent cancers such as breast, endometrium, ovarian, uterine and gastrointestinal cancer.
In particular, overweight and obesity are risk factors for breast cancer in post-menopause women since they are associated to higher level of circulating estrogens, insulin, insulin-like growth factor levels, leptin, adiponectin, growth factors (such as hepatocyte growth factor) and inflammatory cytokines (TNFα and Interleukin-6 (IL-6)). Moreover, they reduce sex hormone binding globulin (SHBG) plasma levels. Overweight and obesity are also negative prognostic factors for breast cancer in post-menopause women since they increase the risk of early relapse and death. An increased weight (2.5-6.2 Kg) is commonly reported during chemotherapy treatment in post-menopause women. This is due to increased appetite, hyperphagia and hydric retention associated with reduced metabolism and physic activities. However, the weight gain during therapy is still not recognised as a negative prognostic factor.
Furthermore, a decrease in weight may also occur during chemotherapy. This is mainly due to lower appetite and early satiety, dysgeusia, nausea and vomiting or intolerance to certain foods. Decreasing weight can determine less efficacy and tolerance in therapy, more complications/infections, more and longer hospitalisations and, as a consequence, a reduced quality of life and survival.
Dysgeusia is an alteration in taste that can determine food aversion, selection of hypercaloric food or reduced food introduction up to malnutrition. More than 75% of patients under chemotherapy refer dysgeusia; this is related to drugs (such as folic acid competitors, cyclophosphamide cisplatin and taxanes) and can last for weeks. ln particular, taxanes determine a peripheral nerves degeneration. The results are a metallic taste and an alteration in salted perception. In addition, they determine a dose-dependent chemotherapy-induced peripheral neuropathy (CIPN) with painful paraesthesia, total areflexia and muscular extremities weakness. Dysgeusia is an underestimated problem. Instrumental examinations and laboratory tests can be useful but they cannot replace a detailed medical history and a close physical examination associated with international validate questionnaires.
At the moment, no agreement was found on chemotherapy-induced dysgeusia prevention and therapy. Patients resolve this problems with cold food, candies before meals and sugary drinks and these behaviours lead to increasing in weight.
STUDY DESIGN
This is a prospective cohort study for the evaluation of eating habits changes and dysgeusia in patients with breast cancer during chemotherapy treatment. It will explore also the potential relations with anxiety, depression, insomnia and quality of life. These evaluations will be actuated using internationally validate questionnaires.
METHODS
This study is based on the collection of data with international validate questionnaires:
* Food frequency questionnaire (FFQ) and photography atlas
* Chemotherapy-induced taste alteration scale (CiTAS): evaluation of changes in taste.
* Functional assessment of cancer therapy (FACT\_B): evaluation of quality of life for physical health, social and familiar health, emotional health, functional health and health in relation with the pathology.
* Beck depression inventory (BDI) and HADS: evaluation of depression presence and its intensity.
* Pittsburgh sleep quality index (PSQI) and insomnia severity index (ISI): evaluation of sleep quality.
* State and trait anxiety inventory (STAI-Y): evaluation of anxiety presence and its intensity.
STATISTICAL CONSIDERATIONS
Based on the proportion of the women in overweight before chemotherapy is 30% and the proportion of the women in overweight after chemotherapy is 50% (with a 5% α error and an 80% strength), the established number of patients to include in the study is 186. In prevision of a 10% loss of patients in follow-up, 204 patients will be included in the study.
