code: def get_num_sequenced(study_id):
      
      data = {'cmd': 'getCaseLists',
              'cancer_study_id': study_id}
      df = send_request(**data)
      if df.empty:
          return 0
      row_filter = df['case_list_id'].str.contains('sequenced', case=False)
      num_case = len(df[row_filter]['case_ids'].tolist()[0].split(' '))
      return num_case
docs: Return number of sequenced tumors for given study.
  
      This is useful for calculating mutation statistics in terms of the
      prevalence of certain mutations within a type of cancer.
  
      Parameters
      ----------
      study_id : str
          The ID of the cBio study.
          Example: 'paad_icgc'
  
      Returns
      -------
      num_case : int
          The number of sequenced tumors in the given study