code: def get_ccle_mutations():
      
      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')
      mutations = cbio_client.get_ccle_mutations(gene_list, cell_lines)
      res = {'mutations': mutations}
      return res
docs: Get CCLE mutations
      returns the amino acid changes for a given list of genes and cell lines