[Good remission under HER2 blockade in an advanced carcinoma of the oesophagogastric junction with only focal HER2 overexpression].

Abstract:

:Gastric cancer and cancer of the oesophagogastric junction is diagnosed in the locally advanced or metastatic setting in 55 - 65 % of the cases and is generally treated with perioperative or palliative chemotherapy. For patients with metastatic disease, it is important to reliably determine the HER2 status for potential treatment with trastuzumab. Unfortunately this assessment is not trivial and afflicted with problems of pronounced tumor heterogeneity as well as with an unclear HER2 scoring algorithm. We report an 80 year old male patient diagnosed with an advanced adenocarcinoma of the oesophagogastric junction (uT3 uN + cM0; Siewert II). The initial external HER2 test was negative (HER2 value 1 +) but was repeated in-house. On the basis of more extensive biopsies focal but strong HER2 positivity (HER2 value 3 +, ~10 % of the tumor cells positive) was demonstrated. The patient subsequently received a combination of oxaliplatin, 5-fluorouracil/folinic acid and trastuzumab, resulting in an improvement of symptoms and a tumor regression. The discrepancy of the two HER2 tests performed was caused by heterogeneity of HER2 expression, not detectable during initial sampling due to a low number of tumor containing biopsies. In addition, uncertainties of the HER2 scoring algorithm of oesophagogastric cancer samples could have played a role. This case report illustrates that oesophagogastric carcinoma with an only minor HER2 positive clone may benefit from an anti-HER2 therapy in combination with chemotherapy. It also describes problems and challenges associated with HER2 testing of oesophagogastric carcinoma, especially when only a few tumor-bearing biopsies could be obtained. :Das Magenkarzinom und das Karzinom des ösophagogastralen Überganges werden in 55 – 65 % der Fälle im lokal fortgeschrittenen bzw. metastasierten Stadium diagnostiziert und in der Regel mit einer perioperativen bzw. palliativen Chemotherapie behandelt. Im metastasierten Stadium muss der HER2-Status als positiver prädiktiver Faktor für eine Therapie mit Trastuzumab vor Therapieeinleitung zuverlässig bestimmt werden. Leider ist diese Bestimmung aber nicht trivial und sowohl mit dem Problem der ausgesprochenen Tumorheterogenität für HER2 als auch mit Problemen des HER2-Auswertungsalgorithmus behaftet. Wir berichten über einen 80 Jahre alten Patienten, welcher bei neu aufgetretenen Schluckbeschwerden mit einem fortgeschrittenen Adenokarzinom des ösophagogastralen Überganges diagnostiziert wurde (uT3 uN+ cM0; Siewert II). Die initiale auswärtige HER2-Testung verlief negativ (HER2-Score 1 +) wurde aber in domo an umfangreicheren Biopsien wiederholt. Nach nachgewiesener fokaler, aber starker HER2-Positivität (HER2-Wert 3 +, ~10 % der Tumorzellen positiv) wurde eine Kombinationstherapie von Oxaliplatin, 5-Fluoruracil/Folinsäure und Trastuzumab eingeleitet, welche zur Besserung der Beschwerden und zu einer Remission führte. Die hier vorliegende Diskrepanz der zwei durchgeführten HER2-Testungen wurde verursacht durch eine Heterogenität der HER2-Expression, welche in den initialen, eher spärlichen Biopsien nicht erfasst wurde. Außerdem könnten Unterschiede zwischen dem bekannten, weitverbreiteten HER2-Auswertungsalgorithmus des Mammakarzinoms und dem mit Unschärfe behafteten, weniger oft verwendeten Magenkarzinom-Algorithmus eine Rolle gespielt haben. Dieser Fallbericht beschreibt einen Patienten mit gutem Ansprechen auf eine anti-HER2-Therapie in Kombination mit einer Chemotherapie bei einem offensichtlich nur in geringfügigen Anteilen HER2-positiven fortgeschrittenen Karzinom des ösophagogastralen Übergangs und illustriert, welche Probleme mit der HER2-Testung verbunden sind, gerade wenn nur wenig tumortragende Biopsien gewonnen werden konnten.

journal_name

Z Gastroenterol

authors

Gaiser T,Hirsch D,Hofheinz RD

doi

10.1055/s-0043-116493

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

866-871

issue

9

eissn

0044-2771

issn

1439-7803

journal_volume

55

pub_type

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    doi:

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