Background:
Germ cell tumors are rare malignancies that spread rapidly to the lung, thereby negatively
influencing overall survival (OS). Complete resection of the primary tumor, combined
with chemotherapy (CTX) and pulmonary metastasectomy represent the therapy of choice.
However, prognostic factors remain poorly characterized. Therefore, in this two center
study, the clinical course of patients undergoing resection of pulmonary metastases
(MTS) in germ cell tumors was analyzed.
Material and method:
Here, 34 patients (2♀/32♂, median age 33 years) undergoing resection of MTS from 1994
to 2017 were analyzed, retrospectively. We studied the impact of CTX, R0, N0-status,
time of onset and MTS-histology on OS. OS analysis used the Kaplan Meier method. Results
are given as mean/median ± SD.
Results:
CTX prior to metastasectomy (87,5%) was associated with increased 10 years survival
probability by trend (80% vs. 50%, p = 0,148). Pre-OP ASA score I was associated with
improved OS (ASA I vs. ASA II/III 303 ± 24 vs. 146 ± 31 months, p = 0,036). Metachronous
MTS (16,1%) were resected 31 ± 16 months after primary tumor diagnosis and were associated
with an OS of 5 ± 5 months. Synchronous MTS (83,9%) were associated with a significantly
better OS (279 ± 27, p < 0,001). R0-Resection was performed in 85,3% of cases, whereas
N0-status after radical/partial lymphadenectomy was observed in 66,7% and 90% of the
patients. Lymph node involvement was associated with significantly worse OS (N0 vs.
N+ 316 ± 22 vs. 8 ± 3 months, p < 0,0001). Histology of the MTS revealed vital tumor
cells in 67,6% and necrosis in 32,4% of cases. OS in those groups was 203 ± 36 vs.
244 ± 27 months (p = 0,148). Compared to seminoma (5,9%) and embryonal carcinoma (11,8%),
chorioncarcinoma (11,8%) and yolk sac tumors (5,9%) were associated with increased
10 years survival probability (100% vs. 18%, p = 0,009).
Conclusion:
Favorable prognostic factors in patients with MTS of germ cell tumors include ASA
score ≤1, chorioncarcinoma and yolk sac tumor as primary diagnosis. Hilar/mediastinal
lymph node involvement and metachronous MTS represent negative prognostic factors,
therefore lymph node dissection should be performed routinely. In this young group
of patients risk factor associated stratification could guide further adjuvant therapeutical
strategies.