diff --git a/annotation/src/main/java/lcsb/mapviewer/annotation/services/annotators/EntrezAnnotator.java b/annotation/src/main/java/lcsb/mapviewer/annotation/services/annotators/EntrezAnnotator.java
index 7e865e7f7a3e40c024298d24044d67b7609bb266..5e4aea0bcb6267bcfbf9c4ddb64ee54ff6a256eb 100644
--- a/annotation/src/main/java/lcsb/mapviewer/annotation/services/annotators/EntrezAnnotator.java
+++ b/annotation/src/main/java/lcsb/mapviewer/annotation/services/annotators/EntrezAnnotator.java
@@ -49,12 +49,6 @@ import lcsb.mapviewer.modelutils.map.ElementUtils;
 @Service
 public class EntrezAnnotator extends ElementAnnotator implements IExternalService {
 
-  /**
-   * Prefix used in cache key to indicate that cached value contains information
-   * about {@link MiriamType#ENTREZ} to {@link MiriamType#HGNC} conviersion.
-   */
-  public static final String CACHE_HGNC_ID_PREFIX = "HGNC_ID:";
-
   /**
    * Address of Entrez API that should be used for retrieving data.
    */
diff --git a/annotation/src/test/java/lcsb/mapviewer/annotation/services/annotators/EntrezAnnotatorTest.java b/annotation/src/test/java/lcsb/mapviewer/annotation/services/annotators/EntrezAnnotatorTest.java
index 372b83567d2e6b716f3d7ecb08047915088fc89f..243be0a84216996ee47e248c4aed7e5683846390 100644
--- a/annotation/src/test/java/lcsb/mapviewer/annotation/services/annotators/EntrezAnnotatorTest.java
+++ b/annotation/src/test/java/lcsb/mapviewer/annotation/services/annotators/EntrezAnnotatorTest.java
@@ -172,30 +172,6 @@ public class EntrezAnnotatorTest extends AnnotationTestFunctions {
     }
   }
 
-  @Test(timeout = 15000)
-  public void testRefreshToHgncConversion() throws Exception {
-    GeneralCacheInterface cache = entrezAnnotator.getCache();
-    try {
-      entrezAnnotator.setCache(null);
-      assertNull(entrezAnnotator.refreshCacheQuery(EntrezAnnotator.CACHE_HGNC_ID_PREFIX + "blablabla"));
-    } catch (Exception e) {
-      e.printStackTrace();
-      throw e;
-    } finally {
-      entrezAnnotator.setCache(cache);
-    }
-  }
-
-  @Test(timeout = 60000)
-  public void testRefreshToHgncConversion2() throws Exception {
-    try {
-      assertNotNull(entrezAnnotator.refreshCacheQuery(EntrezAnnotator.CACHE_HGNC_ID_PREFIX + "6647"));
-    } catch (Exception e) {
-      e.printStackTrace();
-      throw e;
-    }
-  }
-
   @Test
   public void testRefreshInvalidCacheQuery() throws Exception {
     try {