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diff --git a/src/main/java/dev/dnpm/oshelper/services/systemtherapie/DefaultSystemtherapieService.java b/src/main/java/dev/dnpm/oshelper/services/systemtherapie/DefaultSystemtherapieService.java
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+++ b/src/main/java/dev/dnpm/oshelper/services/systemtherapie/DefaultSystemtherapieService.java
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+/*
+ * This file is part of onkostar-plugin-dnpm
+ *
+ * Copyright (c) 2025 the original author or authors.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package dev.dnpm.oshelper.services.systemtherapie;
+
+import dev.dnpm.oshelper.dto.EcogStatusWithDate;
+import dev.dnpm.oshelper.services.SettingsService;
+import de.itc.onkostar.api.IOnkostarApi;
+import de.itc.onkostar.api.Patient;
+import de.itc.onkostar.api.Procedure;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * Standardimplementierung des Systemtherapieservices
+ *
+ * @since 0.2.0
+ */
+public class DefaultSystemtherapieService implements SystemtherapieService {
+
+    private static final String ECOG_FIELD = "ECOGvorTherapie";
+
+    private final IOnkostarApi onkostarApi;
+
+    private final SettingsService settingsService;
+
+    public DefaultSystemtherapieService(final IOnkostarApi onkostarApi, final SettingsService settingsService) {
+        this.onkostarApi = onkostarApi;
+        this.settingsService = settingsService;
+    }
+
+    /**
+     * Ermittelt eine Zusammenfassung der systemischen Therapien für eine Erkrankung
+     *
+     * @param diseaseId Die ID der Erkrankung
+     * @return Zusammenfassung der systemischen Therapien
+     */
+    @Override
+    public List<Map<String, String>> getSystemischeTherapienFromDiagnose(int diseaseId) {
+        List<Map<String, String>> result = new ArrayList<>();
+        for (Procedure prozedur : onkostarApi.getProceduresForDiseaseByForm(diseaseId, getFormName())) {
+            prozedurToProzedurwerteMapper(prozedur).apply(prozedur).ifPresent(result::add);
+        }
+        return result;
+    }
+
+    /**
+     * Übergibt aktuell immer den Mapper für das Formular "OS.Systemische Therapie",
+     * da beide bekannte Varianten damit gemappt werden können.
+     *
+     * @param procedure Die Prozedur für die ein Mapper erstellt werden soll
+     * @return Der Mapper für die Prozedur
+     */
+    @Override
+    public ProzedurToProzedurwerteMapper prozedurToProzedurwerteMapper(Procedure procedure) {
+        return new OsSystemischeTherapieToProzedurwerteMapper();
+    }
+
+    /**
+     * Ermittelt den letzten bekannten ECOG-Status aus allen Systemtherapieformularen des Patienten
+     *
+     * @param patient Der zu verwendende Patient
+     * @return Der ECOG-Status als String oder leeres Optional
+     */
+    @Override
+    public Optional<String> latestEcogStatus(Patient patient) {
+        return ecogStatus(patient).stream()
+                .max(Comparator.comparing(EcogStatusWithDate::getDate))
+                .map(EcogStatusWithDate::getStatus);
+    }
+
+    /**
+     * Ermittelt jeden bekannten ECOG-Status aus allen Systemtherapieformularen des Patienten
+     *
+     * @param patient Der zu verwendende Patient
+     * @return Eine Liste mit Datum und ECOG-Status als String
+     */
+    @Override
+    public List<EcogStatusWithDate> ecogStatus(Patient patient) {
+        return patient.getDiseases().stream()
+                .flatMap(disease -> onkostarApi.getProceduresForDiseaseByForm(disease.getId(), getFormName()).stream())
+                .filter(procedure -> null != procedure.getStartDate())
+                .sorted(Comparator.comparing(Procedure::getStartDate))
+                .map(procedure -> {
+                    try {
+                        return new EcogStatusWithDate(procedure.getStartDate(), procedure.getValue(ECOG_FIELD).getString());
+                    } catch (IllegalArgumentException e) {
+                        return null;
+                    }
+                })
+                .filter(Objects::nonNull)
+                .collect(Collectors.toList());
+    }
+
+    private String getFormName() {
+        return settingsService
+                .getSetting("systemtherapieform")
+                .orElse("OS.Systemische Therapie");
+    }
+}