Anna Michel

Dr. Anna Michel

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Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 December 2022 in Journal of the Neurological Sciences
Verified
Journal Article
Closed access
MOMarvin Darkwah Oppong
Marvin Darkwah Oppong
LLLasse Lohrer
Lasse Lohrer
KWKarsten Henning Wrede
Karsten Henning Wrede
MCMehdi Chihi
Mehdi Chihi
ASAlejandro N. Santos
Alejandro N. Santos
RJRamazan Jabbarli
Ramazan Jabbarli

7 June 2022 in Journal of Neuro-Oncology
Verified
Journal Article
Open access
PDF file
AMAnna Michel
Anna Michel
TDThiemo Florin Dinger
Thiemo Florin Dinger
ASAlejandro N. Santos
Alejandro N. Santos
DPDaniela Pierscianek
Daniela Pierscianek
MOMarvin Darkwah Oppong
Marvin Darkwah Oppong
RJRamazan Jabbarli
Ramazan Jabbarli
Purpose: Breast cancer (BC) is the most frequently diagnosed tumor entity in women. Occurring at different time intervals (TI) after BC diagnosis, brain metastases (BM) are associated with poor prognosis. We aimed to identify the risk factors related to and the clinical impact of timing on overall survival (OS) after BM surgery. Methods: We included 93 female patients who underwent BC BM surgery in our institution (2008–2019). Various clinical, radiographic, and histopathologic markers were analyzed with respect to TI and OS. Results: The median TI was 45.0 months (range: 9–334.0 months). Fifteen individuals (16.1%) showed late occurrence of BM (TI ≥ 10 years), which was independently related to invasive lobular BC [adjusted odds ratio (aOR) 9.49, 95% confidence interval (CI) 1.47–61.39, p = 0.018] and adjuvant breast radiation (aOR 0.12, 95% CI 0.02–0.67, p = 0.016). Shorter TI (< 5 years, aOR 4.28, 95% CI 1.46–12.53, p = 0.008) was independently associated with postoperative survival and independently associated with the Union for International Cancer Control stage (UICC) III–IV of BC (aOR 4.82, 95% CI 1.10–21.17, p = 0.037), midline brain shift in preoperative imaging (aOR10.35, 95% CI 1.09–98.33, p = 0.042) and identic estrogen receptor status in BM (aOR 4.56, 95% CI 1.35–15.40, p = 0.015). Conclusions: Several factors seem to influence the period between BC and BM. Occurrence of BM within five years is independently associated with poorer prognosis after BM surgery. Patients with invasive lobular BC and without adjuvant breast radiation are more likely to develop BM after a long progression-free survival necessitating more prolonged cancer aftercare of these individuals.

1 August 2021 in World Neurosurgery
Verified
Journal Article
Closed access
AMAnna Michel
Anna Michel
MOMarvin Darkwah Oppong
Marvin Darkwah Oppong
LRLaurèl Rauschenbach
Laurèl Rauschenbach
DPDaniela Pierscianek
Daniela Pierscianek
TDThiemo F. Dinger
Thiemo F. Dinger
NHNicolai El Hindy
Nicolai El Hindy

24 September 2022 in Cancers
Verified
Journal Article
Open access
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AMAnna Michel
Anna Michel
TDThiemo Florin Dinger
Thiemo Florin Dinger
RJRamazan Jabbarli
Ramazan Jabbarli
PDPhilipp Dammann
Philipp Dammann
AUAnne Uerschels
Anne Uerschels
KWKarsten Henning Wrede
Karsten Henning Wrede
Background: Rosette-forming glioneuronal tumor (RGNT) is an extremely rare entity described for the first time in the WHO classification of tumors of the central nervous system in 2007. Predominantly, single case reports of RGNT in the pineal region have been published, and specific therapy concepts are pending. Methods: The study group comprised all patients with the RGNT (CNS WHO grade 1) in the pineal region that underwent microsurgical tumor removal in our center (August 2018–June 2021). Surgical strategy, histological findings, and clinical outcome are presented, and the results are evaluated and compared to published case reports. Results: Four male patients aged under 50 years (range between 20 and 48 years) and one female patient, 51 years old, were included in this study. Chronic headaches and generalized epileptic seizures were the main symptoms. Supra-cerebellar infratentorial gross total tumor resection (GTR) was performed in two cases, two patients underwent subtotal tumor resection, and an endoscopic biopsy was performed in case five. Conclusion: In cases where surgical resection seems feasible with a reasonable surgical risk, we advocate GTR. Regular and long-term MRI follow-up is essential to detect a slow tumor progression. The role of additional chemotherapy or radiotherapy remains unclear.

22 October 2021 in Acta Neurochirurgica
Verified
Journal Article
Open access
PDF file
AMAnna Michel
Anna Michel
TDThiemo Dinger
Thiemo Dinger
MOMarvin Darkwah Oppong
Marvin Darkwah Oppong
LRLaurèl Rauschenbach
Laurèl Rauschenbach
CDCornelius Deuschl
Cornelius Deuschl
RJRamazan Jabbarli
Ramazan Jabbarli
Objective: Occurrence of brain metastases BM is associated with poor prognosis in patients with breast cancer (BC). Magnetic resonance imaging (MRI) is the standard of care in the diagnosis of BM and determines further treatment strategy. The aim of the present study was to evaluate the association between the radiographic markers of BCBM on MRI with other patients’ characteristics and overall survival (OS). Methods: We included 88 female patients who underwent BCBM surgery in our institution from 2008 to 2019. Data on demographic, clinical, and histopathological characteristics of the patients and postoperative survival were collected from the electronic health records. Radiographic features of BM were assessed upon the preoperative MRI. Univariable and multivariable analyses were performed. Results: The median OS was 17 months. Of all evaluated radiographic markers of BCBM, only the presence of necrosis was independently associated with OS (14.5 vs 22.5 months, p = 0.027). In turn, intra-tumoral necrosis was more often in individuals with shorter time interval between BC and BM diagnosis (< 3 years, p = 0.035) and preoperative leukocytosis (p = 0.022). Moreover, dural affection of BM was more common in individuals with positive human epidermal growth factor receptor 2 status (p = 0.015) and supratentorial BM location (p = 0.024). Conclusion: Intra-tumoral necrosis demonstrated significant association with OS after BM surgery in patients with BC. The radiographic pattern of BM on the preoperative MRI depends on certain tumor and clinical characteristics of patients.

10 March 2022 in Cancers
Verified
Journal Article
Open access
PDF file
AMAnna Michel
Anna Michel
MOMarvin Darkwah Oppong
Marvin Darkwah Oppong
LRLaurèl Rauschenbach
Laurèl Rauschenbach
TDThiemo Florin Dinger
Thiemo Florin Dinger
LBLennart Barthel
Lennart Barthel
RJRamazan Jabbarli
Ramazan Jabbarli
Background: Brain metastases requiring surgical treatment determine the prognosis of patients with breast cancer. We aimed to develop the scores for the prediction of short (<6 months) and long (≥3 years) survival after BCBM surgery. Methods: Female patients with BCBM surgery between 2008 and 2019 were included. The new scores were constructed upon independent predictors for short and long postoperative survival. Results: In the final cohort (n = 95), 18 (18.9%) and 22 (23.2%) patients experienced short and long postoperative survival, respectively. Breast-preserving surgery, presence of multiple brain metastases and age ≥ 65 years at breast cancer diagnosis were identified as independent predictors of short postoperative survival. In turn, positive HER2 receptor status in brain metastases, time interval ≥ 3 years between breast cancer and brain metastases diagnosis and KPS ≥ 90% independently predicted long survival. The appropriate short and long survival scores showed higher diagnostic accuracy for the prediction of short (AUC = 0.773) and long (AUC = 0.775) survival than the breast Graded Prognostic Assessment score (AUC = 0.498/0.615). A cumulative survival score (total score) showed significant association with overall survival (p = 0.001). Conclusion: We identified predictors independently impacting the prognosis after BCBM surgery. After external validation, the presented scores might become useful tools for the selection of proper candidates for BCBM surgery.