Trial of Diet, Physical Activity and Breast Cancer Recurrences: the DIANA-5 Study
Condition: Breast Cancer Invasive
MeSH terms: Breast Neoplasms; Recurrence
Study type: Interventional

Summary: 
      The investigators recruited 1542 Breast Cancer (BC) patients and to randomize the
      participants in two groups: 773 have received standard recommendations for healthy lifestyle
      without, however, any active support; 700 have received a combination of individual and group
      contacts over the course of one year, including kitchen courses, gym and dance classes,
      common meals and reinforcing meetings, with emphasis on a comprehensive dietary change
      including low saturated fat and low refined carbohydrates, and high whole grain cereals and
      pulses consumption. Compliance have been monitored through weight change and plasma glucose,
      triglycerides, cholesterol and testosterone.

      The main analysis will be by intention to treat. Under the hypothesis of reducing recurrence
      rate by 25% or 33% the statistical power of the study is 80% or, respectively, 90%, (P<0.05,
      5-year follow-up).
    

Detailed description: 
      Aims The investigators have been proposing a randomized intervention trial of diet and
      physical activity to reduce BC relapse (local, distant), and second ipsilateral or
      contralateral BC risk, in BC patients at high metabolic-endocrine of recurrence risk.

      Secondary aims:

        -  to evaluate the effect of the combined dietary and physical activity change on the
           prevalence of Metabolic Syndrome

        -  to evaluate the effect of the combined dietary and physical activity change on the
           prevalence on risk biomarkers (BMI > 24.9 kg/m^2)

        -  to evaluate the effect of the combined dietary and physical activity change on the
           prevalence on risk biomarkers (testosterone >= 0.4 ng/ml)

        -  to evaluate the effect of the combined dietary and physical activity change on the
           prevalence on risk biomarkers (insulin > pmol/l)

        -  to evaluate the effect of the intervention on the development of other life-style
           related health conditions (other cancers, diabetes, hypertension, dyslipidemia, total
           mortality)

      Recruitment:

      Potential participants have been recruited at the time of diagnosis through follow-up
      clinics, patients' associations, or the media. Patients have been requested to sign an
      informed consent, including authorization for getting blood samples, for storing samples for
      future studies. The investigators collected demographic information, fasting measure body
      weight, height, waist circumference, and blood pressure, blood glucose, LDL and HDL
      cholesterol, triglycerides, testosterone and insulin. Eligible patients have filled in a
      baseline questionnaire on medical history, medication use, reproductive and body weight
      history, usual physical activity, and a validated semi-quantitative food frequency
      questionnaire.

      Biological bank: the investigators collected and stored at -80°C one aliquot of whole blood,
      three 2-ml serum aliquot and two 2-ml buffy coat aliquot.

      Randomization:

      The investigators recruited 1542 patients' high risk and randomized the participants in two
      groups: 773 (control group) have received general standard written recommendation for healthy
      lifestyle without, however, any active support; 770 (intervention group) have received a
      combination of individual and group contacts over the course of one year, including kitchen
      courses, gym and dance classes, common meals and reinforcing meetings, with emphasis on a
      comprehensive dietary and life-style change.

      Randomization has been carried out within strata of age, treatment (no adjuvant therapy,
      chemotherapy only, hormonal therapy only, both hormonal and chemotherapy) and axillary nodal
      status at diagnosis.

      Patients who did not satisfy the high-risk criteria have been given the same general
      recommendations as the control group, and have been followed up as an external low risk
      group.

      Intervention:

      The intervention wanted aim to increase physical activity, controlling weight, and promoting
      healthy diet.

        1. Physical activity: achieve and maintain regular participation in a moderate intensity
           physical activity program of 210 minutes/week (30 min on average per day) over at least
           3 days /week; decrease sedentary behaviors by 30 minutes/day on at least 5 days/week.
           During the first 12 months one group physical activity session per month offered to
           enhance program adoption. Women who wanted to take up vigorous sports encouraged to do
           so. For those who do not progressed to more vigorous activity, the focus was on
           maintaining moderate activities, such as walking. For self-monitoring and compliance
           enhancement, study participants had use logs, fill-in questionnaires and armband to
           monitor physical activity.

        2. Weight control: reducing energy intake relative to expenditure was the primary dietary
           focus for promoting weight loss in overweight or obese participants, while maintaining a
           healthy energy balance was the primary focus for normal weight participants.
           Participants were encouraged to include whole grains, pulses and high-fiber vegetables.

        3. Healthy diet: reducing calorie intake, through the preferred consumptions of highly
           satiating foods, such as unrefined cereals, legumes and vegetables, reducing high
           glycemic index food, high insulinemic foods, saturated fat, preferring instead unrefined
           vegetable fats, such as extra virgin olive oil, nuts and oleaginous seeds, reducing
           protein intake, mainly animal protein (except fish).

      Baseline and yearly measurements:

      Height and weight: electronic scale with women in light clothes and without shoes. In a
      sample of cases body fat and lean mass will be measured with bioelectric impedance (BIA).

      Blood pressure: electronic device. Serum glucose, triglycerides and cholesterol: standard
      quality-controlled laboratory techniques.

      Serum Testosterone and Insulin: Radioimmunoassay (RIA). For testosterone the investigators
      have used a direct RIA kit which has been validated by comparison with indirect assay after
      organic extraction of serum samples and celite purification.

      Compliance:

      Compliance has been monitored through lifestyle questionnaires, dietary questionnaires,
      weight change and plasma glucose, triglycerides, cholesterol, insulin, testosterone changes
      after one year of intervention. A compliance score has been computed, based on the direction
      of change in all these biomarkers.

      Follow-up and outcome events:

      The main outcome is the new BC events including:

        -  new primary breast cancer

        -  local/regional recurrence

        -  distant/metastatic recurrence The follow up have been based on the routine clinical
           follow-up at the collaborating hospitals, the periodic questionnaires to study
           participants, the regional cancer registry and hospital discharge diagnosis system, and
           death certificates.

      Statistical power:

      The survival of BC patients in Italy is dramatically increasing: 5-year relative survival
      increased from 80.6% for patients diagnosed in the early 1990s to 85.6% for patients
      diagnosed in the early 2000s. For these patients the estimated relapse free survival is 81.9.
      Such a survival improvement is accompanied by a postponement of the incidence of relapse.

      The original aim was to recruit 1,200 high risk patients in order to have 600 patients per
      arm, which shall guarantee 80% chance of getting a significant difference also with 25%
      reduction, and allowing for 90% compliance in the intervention group and 10% contamination of
      the control group.

      Statistical analysis:

      Nowadays the investigators are assessing the baseline association between androgens, insulin,
      and several measures of adiposity including body mass index (BMI), waist circumference and
      percentage body fat, through Spearman correlation coefficients. Furthermore, the
      investigators are comparing the change in food consumption, body weight, and geometric means
      of hormones end points from baseline to 12 months in the intervention and control group.

      The main analysis of the intervention effect on the incidence of recurrences is by intention
      to treat, i.e. based on assigned treatment at the time of randomization, regardless of
      adherence. Later, as a secondary analysis the investigators shall assess the effect by change
      in body weight and biomarkers. The investigators shall compute total survival and
      disease-free survival.

      Hazard ratios and confidence intervals will be computed by the Cox proportional hazard model,
      with standard clinic-pathological prognostic covariates as potential confounders. Separate
      analyses will be carried out by Estrogen Receptors, Progesterone Receptors and erbB2 status.
      The investigators decided to carry out another follow-up in 2022 as the relapse time has
      lengthened to 10 years, due to new therapies, and to evaluate the effects on lifestyle due to
      closures during the pandemia severe acute respiratory syndrome-CoV-2.

      Feasibility:

      The principal investigator (at first dr. Franco Berrino and later dr. Anna Villarini) has
      long term experience in carrying on and coordinating epidemiological studies, including
      small-scale dietary intervention studies. The Milano National Cancer Institute and the others
      collaborating center is fully equipped with facilities for kitchen courses and gym
      facilities.

      Control of potential biases:

      Performance bias-patients have been recruited after the main treatments have been planned or
      delivered. In no case the allocation to the intervention or control group or the compliance
      will affect treatment.

      Measurement bias-patients and researchers cannot be blinded, but the ascertainment of outcome
      was carried out by clinicians that were not involved in the study.

      Attrition bias-Based on previous studies the investigators expect a fairly high compliance in
      the intervention group (>90%) but also some modification in the control group. After the main
      analysis by intention to treat, therefore, secondary analyses will be carried out by
      compliance score.
    

Intervention name(s): Intervention group on diet and physical activity; Control group: only public recommendation an lifestyle
Intervention type(s): Behavioral; Behavioral
Intervention description(s): The intervention wanted to increase physical activity, controlling weight, promoting healthy diet.
Physical activity: achieve and maintain regular participation in a moderate intensity physical activity program of 210 minutes/week (30 min on average per day) over at least 3 days /week; decrease sedentary behaviors by 30 minutes/day on at least 5 days/week
Weight control: reducing energy intake relative to expenditure is the primary dietary focus for promoting weight loss in overweight or obese participants, and maintaining a healthy energy balance is the primary focus for normal weight participants. Participants will be encouraged to include whole grains and high-fiber vegetables
Healthy diet: reducing calorie intake, through the preferred consumptions of unrefined cereals, pulses and vegetables, reducing high glycemic index food and high insulinemic foods, such as sugar and milk; reducing sources of saturated fat and animal protein (except fish); Invitation leaflet, explaining the rationale of the study and including basic life-style recommendations, based on the 1997 World Cancer Research Fund recommendations (to be updated in 2007) and the Italian National Institute of Nutrition food pyramid.
Dissemination of the information on the study by media
Yearly follow-up questionnaire on breast events and dietary and physical activity chang
Allocation: Randomized
Intervention model: Parallel Assignment
Intervention model description: Randomized Trial of Diet, Physical Activity and Breast Cancer Recurrences. The investigators recruited 1542 patients' high risk and randomized them in two groups: 773 (control group) have received general standard written recommendation for healthy lifestyle without, however, any active support; 769 (intervention group) have received a combination of individual and group contacts over the course of one year, including kitchen courses, gym and dance classes, common meals and reinforcing meetings, with emphasis on a comprehensive dietary and life-style change.
Masking: None (Open Label)
Primary purpose: Prevention
Keywords: Breast cancer; Diet; Physical activity; Recurrences