diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/AbstractKpaTherapieverlaufDataMapper.java b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/AbstractKpaTherapieverlaufDataMapper.java
index 4a99f4c..46ad72c 100644
--- a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/AbstractKpaTherapieverlaufDataMapper.java
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/AbstractKpaTherapieverlaufDataMapper.java
@@ -1,6 +1,7 @@
 package dev.pcvolkmer.onco.datamapper.mapper;
 
 import dev.pcvolkmer.mv64e.mtb.*;
+import dev.pcvolkmer.onco.datamapper.datacatalogues.AbstractSubformDataCatalogue;
 
 import java.io.IOException;
 import java.util.Arrays;
@@ -12,7 +13,11 @@ import java.util.stream.Collectors;
  * @author Paul-Christian Volkmer
  * @since 0.1
  */
-public abstract class AbstractKpaTherapieverlaufDataMapper<T> implements SubformDataMapper<T> {
+public abstract class AbstractKpaTherapieverlaufDataMapper<T> extends AbstractSubformDataMapper<T> {
+
+    AbstractKpaTherapieverlaufDataMapper(AbstractSubformDataCatalogue catalogue) {
+        super(catalogue);
+    }
 
     protected MtbTherapyIntentCoding getMtbTherapyIntentCoding(String value) {
         if (value == null || !Arrays.stream(MtbTherapyIntentCodingCode.values()).map(MtbTherapyIntentCodingCode::toValue).collect(Collectors.toSet()).contains(value)) {
@@ -125,7 +130,7 @@ public abstract class AbstractKpaTherapieverlaufDataMapper<T> implements Subform
     }
 
     protected OncoProcedureCoding getOncoProcedureCoding(String value) {
-        if (value == null || ! Arrays.stream(OncoProcedureCodingCode.values()).map(OncoProcedureCodingCode::toValue).collect(Collectors.toSet()).contains(value)) {
+        if (value == null || !Arrays.stream(OncoProcedureCodingCode.values()).map(OncoProcedureCodingCode::toValue).collect(Collectors.toSet()).contains(value)) {
             return null;
         }
 
diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/AbstractSubformDataMapper.java b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/AbstractSubformDataMapper.java
new file mode 100644
index 0000000..135ae7f
--- /dev/null
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/AbstractSubformDataMapper.java
@@ -0,0 +1,44 @@
+package dev.pcvolkmer.onco.datamapper.mapper;
+
+import dev.pcvolkmer.onco.datamapper.ResultSet;
+import dev.pcvolkmer.onco.datamapper.datacatalogues.AbstractSubformDataCatalogue;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Abstract common implementation for all subform data mappers
+ *
+ * @since 0.1
+ * @author Paul-Christian Volkmer
+ * @param <T> The destination type
+ */
+public abstract class AbstractSubformDataMapper<T> implements SubformDataMapper<T> {
+
+    protected AbstractSubformDataCatalogue catalogue;
+
+    protected AbstractSubformDataMapper(AbstractSubformDataCatalogue catalogue) {
+        this.catalogue = catalogue;
+    }
+
+    /**
+     * Loads a data set from database and maps it into destination data type
+     * @param parentId The database id of the parent procedure data set
+     * @return The data set to be loaded
+     */
+    @Override
+    public List<T> getByParentId(final int parentId) {
+        return catalogue.getAllByParentId(parentId)
+                .stream()
+                .map(this::map)
+                .collect(Collectors.toList());
+    }
+
+    /**
+     * Maps a single result set into destination object
+     * @param resultSet The result set to start from
+     * @return The destination object
+     */
+    protected abstract T map(ResultSet resultSet);
+
+}
diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaEcogDataMapper.java b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaEcogDataMapper.java
index 5296514..3ef2de4 100644
--- a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaEcogDataMapper.java
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaEcogDataMapper.java
@@ -19,12 +19,10 @@ import java.util.stream.Collectors;
  * @author Paul-Christian Volkmer
  * @since 0.1
  */
-public class KpaEcogDataMapper implements SubformDataMapper<PerformanceStatus> {
-
-    private final EcogCatalogue catalogue;
+public class KpaEcogDataMapper extends AbstractSubformDataMapper<PerformanceStatus> {
 
     public KpaEcogDataMapper(final EcogCatalogue catalogue) {
-        this.catalogue = catalogue;
+        super(catalogue);
     }
 
     /**
@@ -48,7 +46,8 @@ public class KpaEcogDataMapper implements SubformDataMapper<PerformanceStatus> {
                 .collect(Collectors.toList());
     }
 
-    private PerformanceStatus map(final ResultSet resultSet) {
+    @Override
+    protected PerformanceStatus map(final ResultSet resultSet) {
         var builder = PerformanceStatus.builder();
         builder
                 .id(resultSet.getProcedureId().toString())
diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaProzedurDataMapper.java b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaProzedurDataMapper.java
index a97e63e..634e8df 100644
--- a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaProzedurDataMapper.java
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaProzedurDataMapper.java
@@ -1,14 +1,11 @@
 package dev.pcvolkmer.onco.datamapper.mapper;
 
-import dev.pcvolkmer.mv64e.mtb.*;
+import dev.pcvolkmer.mv64e.mtb.OncoProcedure;
+import dev.pcvolkmer.mv64e.mtb.PeriodDate;
+import dev.pcvolkmer.mv64e.mtb.Reference;
 import dev.pcvolkmer.onco.datamapper.ResultSet;
 import dev.pcvolkmer.onco.datamapper.datacatalogues.ProzedurCatalogue;
 
-import java.io.IOException;
-import java.util.Arrays;
-import java.util.List;
-import java.util.stream.Collectors;
-
 /**
  * Mapper class to load and map prozedur data from database table 'dk_dnpm_uf_prozedur'
  *
@@ -17,10 +14,8 @@ import java.util.stream.Collectors;
  */
 public class KpaProzedurDataMapper extends AbstractKpaTherapieverlaufDataMapper<OncoProcedure> {
 
-    private final ProzedurCatalogue catalogue;
-
     public KpaProzedurDataMapper(final ProzedurCatalogue catalogue) {
-        this.catalogue = catalogue;
+        super(catalogue);
     }
 
     /**
@@ -36,14 +31,7 @@ public class KpaProzedurDataMapper extends AbstractKpaTherapieverlaufDataMapper<
     }
 
     @Override
-    public List<OncoProcedure> getByParentId(final int parentId) {
-        return catalogue.getAllByParentId(parentId)
-                .stream()
-                .map(this::map)
-                .collect(Collectors.toList());
-    }
-
-    private OncoProcedure map(final ResultSet resultSet) {
+    protected OncoProcedure map(final ResultSet resultSet) {
         var diseases = catalogue.getDiseases(resultSet.getProcedureId());
 
         if (diseases.size() != 1) {
diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTherapielinieDataMapper.java b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTherapielinieDataMapper.java
index aacc699..211fe1f 100644
--- a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTherapielinieDataMapper.java
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTherapielinieDataMapper.java
@@ -6,9 +6,6 @@ import dev.pcvolkmer.mv64e.mtb.Reference;
 import dev.pcvolkmer.onco.datamapper.ResultSet;
 import dev.pcvolkmer.onco.datamapper.datacatalogues.TherapielinieCatalogue;
 
-import java.util.List;
-import java.util.stream.Collectors;
-
 /**
  * Mapper class to load and map prozedur data from database table 'dk_dnpm_therapielinie'
  *
@@ -17,10 +14,8 @@ import java.util.stream.Collectors;
  */
 public class KpaTherapielinieDataMapper extends AbstractKpaTherapieverlaufDataMapper<MtbSystemicTherapy> {
 
-    private final TherapielinieCatalogue catalogue;
-
     public KpaTherapielinieDataMapper(final TherapielinieCatalogue catalogue) {
-        this.catalogue = catalogue;
+        super(catalogue);
     }
 
     /**
@@ -36,14 +31,7 @@ public class KpaTherapielinieDataMapper extends AbstractKpaTherapieverlaufDataMa
     }
 
     @Override
-    public List<MtbSystemicTherapy> getByParentId(final int parentId) {
-        return catalogue.getAllByParentId(parentId)
-                .stream()
-                .map(this::map)
-                .collect(Collectors.toList());
-    }
-
-    private MtbSystemicTherapy map(final ResultSet resultSet) {
+    protected MtbSystemicTherapy map(final ResultSet resultSet) {
         var diseases = catalogue.getDiseases(resultSet.getProcedureId());
 
         if (diseases.size() != 1) {
diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTumorausbreitungDataMapper.java b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTumorausbreitungDataMapper.java
index ca175d2..aa1c111 100644
--- a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTumorausbreitungDataMapper.java
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTumorausbreitungDataMapper.java
@@ -6,7 +6,6 @@ import dev.pcvolkmer.onco.datamapper.datacatalogues.TumorausbreitungCatalogue;
 
 import java.io.IOException;
 import java.util.Arrays;
-import java.util.Comparator;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -16,12 +15,10 @@ import java.util.stream.Collectors;
  * @author Paul-Christian Volkmer
  * @since 0.1
  */
-public class KpaTumorausbreitungDataMapper implements SubformDataMapper<TumorStaging> {
-
-    private final TumorausbreitungCatalogue catalogue;
+public class KpaTumorausbreitungDataMapper extends AbstractSubformDataMapper<TumorStaging> {
 
     public KpaTumorausbreitungDataMapper(final TumorausbreitungCatalogue catalogue) {
-        this.catalogue = catalogue;
+        super(catalogue);
     }
 
     /**
@@ -37,15 +34,7 @@ public class KpaTumorausbreitungDataMapper implements SubformDataMapper<TumorSta
     }
 
     @Override
-    public List<TumorStaging> getByParentId(final int parentId) {
-        return catalogue.getAllByParentId(parentId)
-                .stream()
-                .map(this::map)
-                .sorted(Comparator.comparing(TumorStaging::getDate))
-                .collect(Collectors.toList());
-    }
-
-    private TumorStaging map(final ResultSet resultSet) {
+    protected TumorStaging map(final ResultSet resultSet) {
         var builder = TumorStaging.builder();
         builder
                 .date(resultSet.getDate("zeitpunkt"))
diff --git a/src/test/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTumorausbreitungDataMapperTest.java b/src/test/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTumorausbreitungDataMapperTest.java
index 2da9fc7..9fa3496 100644
--- a/src/test/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTumorausbreitungDataMapperTest.java
+++ b/src/test/java/dev/pcvolkmer/onco/datamapper/mapper/KpaTumorausbreitungDataMapperTest.java
@@ -20,7 +20,6 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.doAnswer;
-import static org.mockito.Mockito.when;
 
 @ExtendWith(MockitoExtension.class)
 class KpaTumorausbreitungDataMapperTest {
@@ -60,16 +59,10 @@ class KpaTumorausbreitungDataMapperTest {
             return testData.get(columnName);
         }).when(resultSet).getDate(anyString());
 
-        when(resultSet.getProcedureId()).thenReturn(1);
-
         doAnswer(invocationOnMock -> List.of(resultSet))
                 .when(catalogue)
                 .getAllByParentId(anyInt());
 
-        doAnswer(invocationOnMock -> List.of(resultSet))
-                .when(catalogue)
-                .getDiseases(anyInt());
-
         var actualList = this.dataMapper.getByParentId(1);
         assertThat(actualList).hasSize(1);