code: def get_ccle_cna():
      
      if request.method == 'OPTIONS':
          return {}
      response = request.body.read().decode('utf-8')
      body = json.loads(response)
      gene_list = body.get('gene_list')
      cell_lines = body.get('cell_lines')
      cna = cbio_client.get_ccle_cna(gene_list, cell_lines)
      res = {'cna': cna}
      return res
docs: Get CCLE CNA
      -2 = homozygous deletion
      -1 = hemizygous deletion
       0 = neutral / no change
       1 = gain
       2 = high level amplification