Matthias Peiper

Portal application of autologous CD133+ bone marrow cells to the liver : a novel concept to support hepatic regeneration

The liver has a large capacity for regeneration after resection. However, below a critical level of future liver remnant volume (FLRV), partial hepatectomy is accompanied by a significant increase of postoperative liver failure. There is accumulating evidence for the contribution of bone marrow stem cells (BMSCs) to participate in liver regeneration. Here we report on three patients subjected to intraportal administration of autologous CD133+ BMSCs subsequent to portal venous embolization of right liver segments, used to expand left lateral hepatic segments as FLRV. Computerized tomography scan volumetry revealed 2.5‐fold increased mean proliferation rates of left lateral segments compared with a group of three consecutive patients treated without application of BMSCs. This early experience with portovenous application of CD133+ BMSCs could suggest that this novel therapeutic approach bears the potential of enhancing and accelerating hepatic regeneration in a clinical setting.

Ep-CAM expression in squamous cell carcinoma of the esophagus: a potential therapeutic target and prognostic marker

BackgroundTo evaluate the expression and test the clinical significance of the epithelial cellular adhesion molecule (Ep-CAM) in esophageal squamous cell carcinoma (SCC) to check the suitability of esophageal SCC patients for Ep-CAM directed targeted therapies.MethodsThe Ep-CAM expression was immunohistochemically investigated in 70 primary esophageal SCCs using the monoclonal antibody Ber-EP4. For the interpretation of the staining results, we used a standardized scoring system ranging from 0 to 3+. The survival analysis was calculated from 53 patients without distant metastasis, with R0 resection and at least 2 months of clinical follow-up.ResultsEp-CAM neo-expression was observed in 79% of the tumors with three expression levels, 1+ (26%), 2+ (11%) and 3+ (41%). Heterogeneous expression was observed at all expression levels. Interestingly, tumors with 3+ Ep-CAM expression conferred a significantly decreased median relapse-free survival period (log rank, p = 0.0001) and median overall survival (log rank, p = 0.0003). Multivariate survival analysis disclosed Ep-CAM 3+ expression as independent prognostic factor.ConclusionOur results suggest Ep-CAM as an attractive molecule for targeted therapy in esophageal SCC. Considering the discontenting results of the current adjuvant concepts for esophageal SCC patients, Ep-CAM might provide a promising target for an adjuvant immunotherapeutic intervention.

Development and Management of Severe Cutaneous Side Effects in Head-and-Neck Cancer Patients during Concurrent Radiotherapy and Cetuximab

Background:The concurrent administration of cetuximab to radiotherapy has recently been shown to improve the clinical outcome of head-and-neck cancer (HNC) patients. An aggravation of the radiation-induced skin toxicity was not described. Here, however, two cases with severe skin toxicity during the combined treatment are reported.Clinical Observations:In a small group of five patients with locally advanced HNC treated with irradiation and concurrent cetuximab, two cases of unusually severe radiation dermatitis were observed. Both patients developed confluent moist desquamations confined to the irradiation field at a dose of 40 Gy (CTC [Common Toxicity Criteria] grade 3), which progressed into an ulcerative dermatitis (grade 4) at 58 Gy and 46 Gy, respectively. Histopathology showed a vacuolic degeneration of basal keratinocytes, subepidermal blister formation, and mixed perivascular and interstitial inflammatory infiltrates leading to a complete loss of the epidermis. These cutaneous side effects led to the discontinuation of radiotherapy. Topical corticosteroids and systemic antibiotic treatment resulted in wound healing, which allowed the continuation of radiotherapy.Conclusion:These findings indicate that cetuximab may have the potential to enhance the severity of radiation dermatitis in HNC patients. A systematic monitoring of cutaneous side effects during radiotherapy plus cetuximab is advised in order to reliably estimate the frequency of severe (grade 3/4) radiation dermatitis.Hintergrund:Die simultane Applikation von Cetuximab zur Strahlentherapie verbessert nach einer kürzlich publizierten Studie die Prognose von Patienten mit Kopf-Hals-Tumoren (HNC). Hinweise auf eine Verstärkung der strahlenbedingten Hautreaktion ergaben sich nicht. Im Folgenden wird allerdings über zwei Fälle mit schwersten Hautreaktionen während der kombinierten Behandlung berichtet.Beobachtungen:In einer kleinen Gruppe von fünf Patienten mit HNC, die mit Bestrahlung und simultanem Cetuximab behandelt wurden, war bei zwei Patienten eine ungewöhnlich starke Radiodermatitis zu beobachten. Beide Patienten entwickelten während der Behandlung bei einer Dosis von 40 Gy zunächst konfluierende feuchte Epitheliolysen in den Bestrahlungsfeldern (CTC [Common Toxicity Criteria] Grad 3), welche bei einer Dosis von 58 Gy bzw. 46 Gy in ulzerative Dermatitiden übergingen (CTC Grad 4). Histopathologisch zeigten sich vakuolische Degenerationen der basalen Keratinozyten, subepidermale Blasenbildungen sowie perivaskuläre und interstitielle inflammatorische Infiltrate mit komplettem Verlust der Epidermis. Diese Nebenwirkungen führten in beiden Fällen zu einer Unterbrechung der Radiotherapie. Durch eine intensive Therapie mit topischen Glukokortikosteroiden sowie eine systemische antibiotische Behandlung kam es zur kompletten Abheilung, was die Fortsetzung der Bestrahlung ermöglichte.Schlussfolgerung:Diese Beobachtungen zeigen, dass Cetuximab das Potential haben könnte, den Grad der Radiodermatitis bei Patienten mit HNC wesentlich zu verstärken. Ein systematisches Monitoring der Hautnebenwirkungen während der Radiotherapie in Kombination mit Cetuximab ist erforderlich, um die Häufigkeit der schweren Radiodermatitis (Grad 3/4) verlässlich einschätzen zu können.

Bevacizumab as a Treatment Option for Radiation-Induced Cerebral Necrosis

Radiation necrosis of normal CNS tissue represents one of the main risk factors of brain irradiation, occurring more frequently and earlier at higher total doses and higher doses per fraction. At present, it is believed that the necrosis results due to increasing capillary permeability caused by cytokine release leading to extracellular edema. This process is sustained by endothelial dysfunction, tissue hypoxia, and subsequent necrosis. Consequently, blocking the vascular endothelial growth factor (VEGF) at an early stage could be an option to reduce the development of radiation necrosis by decreasing the vascular permeability. This might help to reverse the pathological mechanisms, improve the symptoms and prevent further progression. A patient with radiationinduced necrosis was treated with an anti-VEGF antibody (bevacizumab), in whom neurologic signs and symptoms improved in accordance with a decrease in T1-weighted fluid-attenuated inversion recovery signals. Our case report together with the current literature suggests bevacizumab as a treatment option for patients with symptoms and radiological signs of cerebral necrosis induced by radiotherapy.Die strahleninduzierte Radionekrose des Gehirns stellt eine schwerwiegende Komplikation der Strahlentherapie dar und tritt bei hohen Gesamtdosen oder hohen fraktionierten Einzeldosen häufiger und früher auf. Es wird vermutet, dass hierfür eine erhöhte Freisetzung von Zytokinen ursächlich ist, die zu einer erhöhten Kapillarpermeabiliät und in der Folge zu einem extrazellulären Ödem führt. Dieser Prozess wird durch die endotheliale Dysfunktion sowie eine Gewebehypoxie weiter verstärkt und kann letztendlich zu einer Nekrose führen. Eine Blockade des vaskulären endothelialen Wachstumsfaktors (vascular endothelial growthfactor; VEGF) könnte diese verstärkte vaskuläre Permeabilität vermindern. Somit könnten pathologische Prozesse umgekehrt, neurologische Ausfallerscheinungen vermindert und ein Fortschreiten der Problematik verhindert werden. Wir präsentieren hier einen Fall einer strahleninduzierten Nekrose, bei dem sich unter Therapie mit einem anti-VEGF Antikörper (Bevacizumab) eine Besserung der neurologischen Zeichen und Symptome in Analogie zu einer MR-morphologischen Abnahme des T2-Signals zeigte. Eine Zusammenschau dieses Falles und der aktuellen verfügbaren Literatur lässt den Schluss zu, dass Bevacizumab eine Behandlungsoption für Patienten mit Symptomen und radiologischen Zeichen einer strahleninduzierten zerebralen Nekrose sein kann.

Copy Number of Chromosome 17 but Not HER2 Amplification Predicts Clinical Outcome of Patients With Pancreatic Ductal Adenocarcinoma

PURPOSE To determine the frequency and the potential clinical use of HER2 (17q21) gene amplification and chromosome 17 aneuploidy in pancreatic ductal adenocarcinoma (PDAC). MATERIALS AND METHODS Serial tissue sections of 50 resected PDACs were analyzed with chromogenic in situ hybridization using locus-specific HER2 probes and centromeric probes for chromosome 17. Centromeric probes for chromosome 7 and 8 were hybridized to confirm ploidy levels. Expression of HER2 protein was assessed by immunohistochemistry. Correlations of experimental findings with clinical and follow-up data were tested. RESULTS The HER2 gene locus was frequently (24%) amplified in PDAC and the rate of overexpression (2+ and 3+) was 10%, but no prognostic significance was found. Copy number analysis of chromosomes 7, 8, and 17 revealed disomic (40%), trisomic (36%), and hypertetrasomic (24%) tumors. Compared with patients with disomic tumors, patients with hypertetrasomic tumors exhibited a significantly decreased relapse-free and overall survival (5.0 v 13.0 months, P = .0144 and 7.0 v 20.0 months, P = .0099, respectively). Multivariate analysis confirmed the independent prognostic significance of hypertetrasomy. CONCLUSION Tumor ploidy levels correlate with prognosis of PDAC patients, indicating characteristic biologic properties of PDAC with high chromosomal instability. In contrast, no prognostic influence on patient outcome was found for the amplification of the HER2 oncogene or p185(HER2) overexpression. Therefore, evaluation of ploidy levels offers new opportunities for patient stratification in clinical trials and enables novel approaches to study the well-known aggressiveness of PDAC.

Gene expression analysis of pancreatic cell lines reveals genes overexpressed in pancreatic cancer

Background: Pancreatic cancer is one of the leading causes of cancer-related death. Using DNA gene expression analysis based on a custom made Affymetrix cancer array, we investigated the expression pattern of both primary and established pancreatic carcinoma cell lines. Methods: We analyzed the gene expression of 5 established pancreatic cancer cell lines (AsPC-1, BxPC-3, Capan-1, Capan-2 and HPAF II) and 5 primary isolates, 1 of them derived from benign pancreatic duct cells. Results: Out of 1,540 genes which were expressed in at least 3 experiments, we found 122 genes upregulated and 18 downregulated in tumor cell lines compared to benign cells with a fold change >3. Several of the upregulated genes (like Prefoldin 5, ADAM9 and E-cadherin) have been associated with pancreatic cancer before. The other differentially regulated genes, however, play a so far unknown role in the course of human pancreatic carcinoma. By means of immunohistochemistry we could show that thymosin β-10 (TMSB10), upregulated in tumor cell lines, is expressed in human pancreatic carcinoma, but not in non-neoplastic pancreatic tissue, suggesting a role for TMSB10 in the carcinogenesis of pancreatic carcinoma. Conclusion: Using gene expression profiling of pancreatic cell lines we were able to identify genes differentially expressed in pancreatic adenocarcinoma, which might contribute to pancreatic cancer development.

Malignant fibrous histiocytoma of the extremities and trunk: an institutional review.

BACKGROUND Malignant fibrous histiocytoma (MFH) is the most common subtype of soft-tissue sarcoma. Detailed understanding of this tumor type may lead to improved therapeutic strategies. METHODS An institutional review was performed on all patients with primary MFH of the extremities and trunk operated on between 1988 and 2000. RESULTS Ninety-seven patients with histologically confirmed MFH (G1, n=8; G2, n=25; G3, n=64) were analyzed. Local recurrence was 31% after a median of 13 months. Distant metastases occurred in 29 patients (30%). After a median follow-up of 4.5 years, 54 patients were alive without evidence of disease; median survival time was 84 months at a cumulative 5-year survival rate of 70%. Tumor size significantly influenced disease-free survival (T2 vs T1, P<.01, risk ratio [RR] 6.0), as did tumor depth (subfascial tumors, P<.01, RR 3.1) and presence of positive lymph nodes (P=.02, RR 6.9). Positive microscopic margins and subfascial tumors were associated with an increased local recurrence rate (RR 4.8, P<.001 and RR 3.5, P=.02, respectively). Significant multivariate risk factors of distant metastases were tumor size, depth, and grade. Though not performed in a randomized fashion, a subgroup analysis indicated that adjuvant radiation therapy significantly reduced local tumor failure. CONCLUSION We conclude that aggressive, albeit limb-preserving resection of MFH, should be performed at initial operation to minimize risk of local recurrence; a strict follow-up especially of subfascial tumors should be performed.

Methylated APC and GSTP1 genes in serum DNA correlate with the presence of circulating blood tumor cells and are associated with a more aggressive and advanced breast cancer disease.

BackgroundTumor-related methylated DNA and circulating tumor cells (CTC) in the peripheral blood might be of prognostic importance in breast cancer. Thus, the aim of our study was to examine free methylated DNA and CTC in the blood from breast cancer patients and to correlate it with clinicopathological features known to influence prognosis.Materials and methodsWe prospectively obtained serum samples from 85 patients with breast cancer and 22 healthy volunteers. Sera were analysed by methylation specific PCR (MethyLight PCR) for five genes: adenomatous polyposis coli (APC), ras association domain family protein 1A (RASSF1A), estrogen receptor 1 (ESR1), CDKN2A (p16) and glutathione s-transferase pi 1 (GSTP1). Beta actin (ACTB) served as control. In parallel matched peripheral blood of 63 patients was used to assay for circulating tumor cells in the peripheral blood by a modified immunomagnetic AdnaTest BreastCancerSelect with PCR detection for EPCAM, MUC1, MGB1 and SPDEF.ResultsWe found a hypermethylation in the APC gene in 29% (25/85), in RASSF1A in 26% (22/85), in GSTP1 in 18% (14/76) and in ESR1 in 38% (32/85) of all breast cancer patients. No hypermethylation of CDKN2A was found (0/25). Blood samples of patients were defined CTC positive by detecting the EPCAM 13% (8/63), MUC1 16% (10/63), MGB 9% (5/55), SPDEF 12% (7/58) and in 27% detecting one or more genes (15/55). A significant difference was seen in methylated APC DNA between cancer patients and healthy volunteers. Moreover, methylated APC, RASSF1 and CTC were significantly different in metastatic versus non-metastatic disease. In addition, the presence of methylated APC, RASSF1A and CTC correlated significantly with AJCC-staging (p = 0.001, p = 0.031 and 0.002, respectively). High incidences of methylations were found for the genes RASSF1 and ESR1 in healthy individuals (both 23% 5/22). Methylated GSTP1 was predominantly found in the serum of patients with large primaries (p = 0.023) and was highly significantly correlated with positive Her2/neu status (p = 0.003). Elevated serum CA15.3 was strongly correlated with methylated APC and CTC detection (both p = 0.000). Methylated ESR1 failed to exhibit significant correlations with any of the above mentioned parameters. The presence of CTC in peripheral blood was significantly associated with methylated APC (p = 0.012) and methylated GSTP1 (p = 0.001).ConclusionThe detection of methylated APC and GSTP1 DNA in serum correlated with the presence of CTC in the blood of breast cancer patients. Both methylated DNA and CTC correlated with a more aggressive tumor biology and advanced disease.

Long-term Survival After Surgery for Primary Hepatic Sarcoma in Adults

HYPOTHESIS Patients with primary hepatic sarcomas benefit from resection, with possible long-term cure. DESIGN Retrospective and prospective cohort study. SETTING University hospitals of Hamburg-Eppendorf and Düsseldorf, Germany. PATIENTS Between 1985 and 2006, 22 patients (8 men and 14 women; median age at initial diagnosis, 54 years [range, 19-80 years]) were surgically treated for primary hepatic sarcomas. INTERVENTION Tumor resection with curative intent ranging from nonanatomical resection to liver transplant. MAIN OUTCOME MEASURES Effects on overall survival were analyzed using the log-rank test. RESULTS The majority of tumors were more than 5 cm (n = 19), with a median tumor size of 7 cm (range, 4-14 cm); of intermediate differentiation (G2; n = 15); and classified as leiomyosarcoma (n = 7). Ten patients received a hemihepatectomy. In 4 patients, a bisegmentectomy was performed and in 2 patients, a segmentectomy, while 4 patients received a nonanatomical resection. Liver transplant was performed in 2 patients. In 18 patients, complete tumor resection (R0) was achieved. Perioperative mortality was 0%. Median follow-up was 88 months (range, 6-246 months). Local recurrence occurred in 6 patients. Distant metastases were diagnosed in 10 patients, predominantly in the lung (n = 6). The 5-year survival after surgery was 65%, with 41% of the patients living more than 10 years without disease. Patients with angiosarcoma had a poor prognosis (P = .03). CONCLUSIONS Although primary hepatic sarcoma is a rare malignant tumor, no standard treatment is established. A long-term survival is possible after complete tumor resection in a preselected population with early-stage disease.

Human pancreatic cancer cells (MPANC‐96) recognized by autologous tumor‐infiltrating lymphocytes after in vitro as well as in vivo tumor expansion

A human tumor line designated MPanc‐96 has been established from a poorly differentiated primary pancreatic adenocarcinoma. MPanc‐96 has a doubling time of 27 hr and grows as a confluent monolayer in various culture media. Cytogenetic analysis of in vitro–cultured tumor cells revealed a large number of clonal chromosomal aberrations, confirming their neoplastic origin. MPanc‐96 grows in SCID mice when injected s.c. Xenografts established from the tumor line had a similar histology as the primary tumor. Tumor‐infiltrating lymphocytes (TILs) were isolated from the primary tumor, and cytotoxic T lymphocytes (CTLs) were generated after activation on immobilized anti‐CD3 monoclonal antibody (MAb) for 48 hr, expansion in low‐dose IL‐2 and repeated stimulation with irradiated MPanc‐96 tumor cells. The generated CTLs lysed fresh autologous tumor cells as well as in vitro and in vivo expanded tumor cells from passages 9–53, suggesting that one or more tumor‐associated antigens (TAAs) are stably expressed. CTLs lysed tumor cells in an HLA‐class I–restricted fashion but showed no significant cytotoxicity against autologous fibroblasts, several allogeneic pancreatic cancer cell lines or K562. Our findings may be significant for the design of an animal model for studying the mechanisms of immunotherapy in human pancreatic cancer or for the identification of TAAs in pancreatic cancer. Int. J. Cancer 71: 993‐999, 1997.