Here is the design of a clinical trial:

Official Title: Effects of a Traditional Chinese Exercise Program- Tai Chi on Symptom Cluster of Fatigue-sleep Disturbance-depression in Female Breast Cancer Patients: a Preliminary Randomized Controlled Trial

Included conditions:
- Breast Neoplasm Female
- Symptom Cluster
- Tai ji

Study Armgroups:
- {'label': 'control group', 'type': 'OTHER', 'description': 'standard care (intervention provided after the completion of the trial)', 'interventionNames': ['Other: control group']}
- {'label': 'tai chi group', 'type': 'EXPERIMENTAL', 'description': 'Tai chi intervention + standard care', 'interventionNames': ['Behavioral: tai chi group']}

Interventions:
- {'type': 'OTHER', 'name': 'control group', 'description': 'A booklet on the self-management of cancer symptoms. After the pilot RCT is completed, if the participants allocated to the control group are interested in practising tai chi, the intervention will be provided', 'armGroupLabels': ['control group']}
- {'type': 'BEHAVIORAL', 'name': 'tai chi group', 'description': 'Around 60 minutes practising easy tai chi movements/postures twice per week', 'armGroupLabels': ['tai chi group']}

Primary Outcomes:
- {'measure': 'Time taken to recruit planned sample', 'description': 'the time that was taken to recruit the planned sample size of participants', 'timeFrame': 'From baseline (T1) to the completion of the 8-week intervention (T2)'}
- {'measure': 'Referral rate', 'description': 'The number of referrals made by clinicians in different departments and hospitals divided by all referrals', 'timeFrame': 'From baseline (T1) to the completion of the 8-week intervention (T2)'}
- {'measure': 'Recruitment rate', 'description': 'The number of subjects who enrolled in the study divided by all subjects eligible for enrolment', 'timeFrame': 'From baseline (T1) to the completion of the 8-week intervention (T2)'}
- {'measure': 'Retention rate', 'description': 'The number of subjects who completed the study divided by all subjects who enrolled in the study', 'timeFrame': 'From baseline (T1) to the completion of the 8-week intervention (T2)'}
- {'measure': 'Dropout rate', 'description': 'The number of subjects who dropped out after randomization divided by all subjects who enrolled in the study', 'timeFrame': 'From baseline (T1) to the completion of the 8-week intervention (T2)'}
- {'measure': 'Reasons for dropping out', 'description': 'Feedback from the dropout subjects to identify their reasons for dropping out', 'timeFrame': 'From baseline (T1) to the completion of the 8-week intervention (T2)'}
- {'measure': 'Feasibility of the questionnaires', 'description': 'The percentage of missing values for each item of the scales used, including the Brief Fatigue Inventory (BFI), the Pittsburgh Sleep Quality Index (PSQI), the Hospital Anxiety and Depression Scale (HADS), and the Functional Assessment of Cancer Therapy-Breast (FACT-B)', 'timeFrame': 'Baseline (T1), immediately after completion of the 8-week intervention (T2), and four weeks after completion of the intervention (T3)'}
- {'measure': 'Adherence rates', 'description': 'The adherence rates will be measured by the number of tai chi sessions performed divided by the total possible tai chi sessions', 'timeFrame': 'Immediately after completion of the 8-week intervention (T2)'}
- {'measure': 'Participant feedback', 'description': "Participants' feedback on and satisfaction with the intervention using a self-designed feedback form", 'timeFrame': 'Immediately after completion of the 8-week intervention (T2)'}
- {'measure': 'Adverse events associated with the intervention', 'description': 'In each tai chi session, the subjects in the intervention group will record whether they had any uncomfortable feelings', 'timeFrame': 'Immediately after completion of the 8-week intervention (T2)'}
- {'measure': 'Number of patients completed the exercise log', 'description': 'The participants in the tai chi group will be required to keep a diary to monitor their tai chi exercise after each tai chi session', 'timeFrame': 'Immediately after completion of the 8-week intervention (T2)'}

Please estimate the sample size based on the assumption: 
A conservative anticipation of a 20% drop-out rate is considered.
Sample size calculation
        Thirty or more participants per group are usually recommended as sufficient for a pilot study to examine intervention feasibility21 and to estimate a between-group effect for a subsequent power analysis that can be used in the main studyâs sample size estimation.22 Given that the primary purpose of this study will be exploring the feasibility and acceptability of the studyâs methodological procedures, intervention protocol and questionnaires, 30 participants per group were, therefore, determined to be an appropriate sample size. Taking into account a conservative anticipation of a 20% drop-out rate, the final sample size will therefore be 36 in each group, with a total of 72 participants.23