code: def get_case_lists(study_id):
      
      data = {'cmd': 'getCaseLists',
              'cancer_study_id': study_id}
      df = send_request(**data)
      case_set_ids = df['case_list_id'].tolist()
      return case_set_ids
docs: Return a list of the case set ids for a particular study.
  
      TAKE NOTE the "case_list_id" are the same thing as "case_set_id"
      Within the data, this string is referred to as a "case_list_id".
      Within API calls it is referred to as a 'case_set_id'.
      The documentation does not make this explicitly clear.
  
      Parameters
      ----------
      study_id : str
          The ID of the cBio study.
          Example: 'cellline_ccle_broad' or 'paad_icgc'
  
      Returns
      -------
      case_set_ids : dict[dict[int]]
          A dict keyed to cases containing a dict keyed to genes
          containing int