anchor.diff:      ArrayList<CancerStudy> cancerStudies = (ArrayList<CancerStudy>)
               request.getAttribute(QueryBuilder.CANCER_TYPES_INTERNAL);
   
  +    // Get priority settings
  +    Integer dataPriority;
  +    try {
  +        dataPriority
  +                = Integer.parseInt(request.getParameter(QueryBuilder.DATA_PRIORITY).trim());
  +    } catch (NumberFormatException e) {
  +        dataPriority = 0;
  +    }
  +
  +    // Divide histograms only if we are interested in mutations
  +    boolean divideHistograms = (dataPriority != 2);
  +
  +
  +    // Now pool the cancer studies
       ArrayList<CancerStudy> cancerStudiesWithMutations = new ArrayList<CancerStudy>(),
                              cancerStudiesWithOutMutations = new ArrayList<CancerStudy>();
       for(CancerStudy cancerStudy: cancerStudies) {
  -        if(cancerStudy.hasMutationData()) {
  +        if(!divideHistograms) {
  +          // A dirty maneuver to show all studies within a single histogram
  +          cancerStudiesWithMutations.add(cancerStudy);
  +        } else if(cancerStudy.hasMutationData()) {
               cancerStudiesWithMutations.add(cancerStudy);
           } else {
               cancerStudiesWithOutMutations.add(cancerStudy);
  
positive.code: 
      ServletXssUtil servletXssUtil = ServletXssUtil.getInstance();
      String geneList = servletXssUtil.getCleanInput(request, QueryBuilder.GENE_LIST);
  
      // Get priority settings
      Integer caseSetPriority;
      try {
          caseSetPriority
                  = Integer.parseInt(request.getParameter(QueryBuilder.DATA_PRIORITY).trim());
      } catch (NumberFormatException e) {
          caseSetPriority = 0;
      }
  
      // Infer whether there is multiple genes or not (for histogram switching)
      int geneCount = 0;
  
negative.code:            }
  
             var options = {
                title: divideHistograms ? 'Percent Sample Alteration for Each Cancer Study with Mutation Data (' + genesQueried + ')' : 'Percent Sample Alteration for Each Cancer Study (' + genesQueried + ')',
                colors: ['#aaaaaa', '#008000', '#002efa', '#ff2617'],
                legend: {
                  position: 'bottom'
  