Brain metastases from gastrointestinal tumours: Tailoring the approach to maximize the outcome

Skull base metastasis as initial presentation of hepatocellular carcinoma

Background

Intracranial metastatic deposits due to hepatocellular carcinoma (HCC) are rare. Only a few cases are reported in the literature. These may be more likely to come to clinical attention than extrahepatic metastases in other sites since they often produce symptoms that necessitate neurosurgical intervention.

Case Description

We report a case of a 53-year-old male with biopsy-proven intracranial skull base metastasis from HCC as an unusual initial presentation of the disease and review the relevant literature on this entity.

Conclusion

Intracranial metastasis of HCC should be included in the differential diagnosis of rapidly growing metastatic lesions in unusual locations, particularly in chronic liver disease and hepatitis B surface antigen-positive or hepatitis C patients.

Brain metastasis from gastric adenocarcinoma: A large comprehensive population-based cohort study on risk factors and prognosis

Aims

Although brain metastasis from gastric adenocarcinoma (GaC) is rare, it may significantly affect survival and quality of life. The aim of this large, comprehensive, population-based cohort investigation was to investigate factors that were associated with brain metastasis from GaC and to explore the prognostic factors and time-dependent cumulative mortalities among cases with GaC and brain involvement.

Methods

Population-based information on cases with GaC diagnosed from 2010 to 2016 was obtained from a large-scale database. Factors that were associated with brain metastasis were investigated utilizing multivariable logistic regression. Time-dependent tumor-specific mortalities of cases with GaC and brain involvement were then computed utilizing the cumulative incidence functions (CIFs), and mortalities were compared between subgroups utilizing Gray's test. Factors that were associated with death were further evaluated utilizing multivariable Fine-Gray subdistribution hazard regression.

Results

Together, 28,736 eligible cases were included, which comprised 231 (1%) cases with brain metastasis and 10,801 (38%) with metastasis to other sites, encompassing a follow-up of 39,168 person-years. Brain metastasis occurred more often among younger patients (within overall cancers), in cases with stomach cardia tumors, within cases with signet-ring cell carcinoma (within overall cancers), and within cases with positive lymph nodes (within overall tumors); it was less often detected among black people. Brain involvement was associated with more lung and bone metastases. The median survival time of cases having brain metastasis was only 3 months; the 6- and 12-month tumor-specific cumulative mortalities were 57% and 71%, respectively. Among cases with GaC and brain metastasis, those with gastric cardia cancers (when receiving radiotherapy), those undergoing resection, and those receiving chemotherapy had lower mortality risks, while younger patients (when receiving chemotherapy or radiotherapy) and people with positive lymph nodes (when receiving radiotherapy) had higher death hazards.

Conclusion

Among patients with GaC, brain metastasis was correlated with several clinical and pathological variables, including ethnicity, age, cancer histology, location, lymph node involvement, and metastases to other sites. Cases having brain metastasis had poor survival that was correlated with age, cancer location, lymph node metastasis, and management. These findings offer vital clues for individualized patient care and future mechanistic explorations.

Metastatic pancreatic adenocarcinoma presenting as an occipital haemorrhage

We report a case of a 63-year-old woman who was presented to the emergency department with an occipital haemorrhage secondary to a pancreatic cerebral metastasis. Pancreatic cancer is the ninth most common cancer in women in Australia, and distant disease is present in 70% of patients with pancreatic cancer at the time of diagnosis. However, metastases to the brain are rare, accounting for only 0.33%-0.57% cases antemortem. Herein, we discuss the management of this unusual case to highlight the importance of recognising unusual central nervous system involvement of cancers, a problem which may be increasing in prevalence.

Brain metastases from hepatocellular carcinoma: recent advances and future avenues

The incidence of brain metastases from hepatocellular carcinoma (BMHCC) is becoming more frequent than that of the past as a result of prolonged survival of patients with HCC. Compared with brain metastases from other types of cancer, BMHCC tends to exhibit a high incidence of intracerebral hemorrhage (ICH) and poor liver function. Unfortunately, the prognosis is extremely poor for patients with BMHCC owing to the limited treatment selection. Currently, optimal treatment requires multidisciplinary approaches including surgery, whole-brain radiation therapy and stereotactic radiosurgery. Besides these traditional approaches, novel treatments such as target therapy and immunotherapy provide an opportunity to improve the survival of these patients. This review provides an overview of the incidence, characteristics, prognosis, and current and potential future management strategies for BMHCC.

The evolving clinical management of cerebral metastases

Concepts in the management of brain metastases are evolving. Until recently, brain metastases have been considered as a homogenous condition, managed with whole brain radiotherapy, surgical resection for large lesions and stereotactic radiosurgery for smaller lesions. Increasingly, specific systemic medical therapies are being used to treat brain metastases based on the primary site of disease. This disease specific management is causing a change in perspective about brain metastases and has led to improved survival for patients with primary disease subtypes amenable to tailored medical therapies. We review the recent literature to present evidence for the use of subtype specific medical therapies, advances in surgical resection techniques and stereotactic radiosurgery as the primary treatment modalities. The decline in use of whole brain radiotherapy as first line treatment is also discussed. Based on the recent literature, we propose a new management algorithm to reflect the progress in available options for tailoring disease specific treatments and support the change in paradigm to consider brain metastases as separate disease states based on the primary site of cancer rather than as a homogenous entity.

Comparison of the molecular profile of brain metastases from colorectal cancer and corresponding primary tumors

AIM

Little is known about molecular biology of brain metastasis (BM) from colorectal cancer and its concordance with matched primary tumors.

MATERIALS & METHODS

We identified 56 consecutive colorectal cancer patients who underwent neurosurgical resection of BM. Tumor samples were tested for KRAS, NRAS, BRAF and PIK3CA. The molecular profile of the brain lesion was compared with the corresponding primary tumor.

RESULTS

The molecular profile concordance rate was 95.1%. Median survival after neurosurgery was 5.5 months (95% CI: 4.7-6.3); median overall survival was 24.0 months (95% CI: 15.6-32.4).

CONCLUSION

In this cohort, we report a high frequency of KRAS mutations and a very high concordance rate between the molecular status of BM and that of matched primary tumors.

Central nervous system involvement in breast cancer patients: Is the therapeutic landscape changing too slowly?

Central nervous system (CNS) involvement from breast cancer (BC) has been historically considered a relatively rare event. However, the development of new therapeutic strategies with a better control of extra-cranial disease and a longer overall survival (OS) has determined an increased incidence of brain metastases. Patients with HER2-positive or triple negative BC have higher occurrence of CNS involvement than patients with luminal-like disease. Moreover, after development of brain metastases, the prognosis is highly influenced by biological subtype. In patients with multiple brain metastases who experience important neurological symptoms, palliative treatment, with or without whole brain radiation therapy (WBRT), needs to be considered the first step of a multidisciplinary therapeutic approach. Patients with a good performance status and 1-3 brain lesions should be considered for radical surgery; patients technically inoperable with 4-5 metastases smaller than 3cm may undergo stereotactic radiosurgery. The role of systemic therapy in the management of patients with brain metastases is controversial. Preliminary data suggest that systemic therapy after WBRT may improve survival in BC patients with brain lesions. In patients with HER2-positive disease, several retrospective or post hoc analyses showed a longer brain progression-free survival with trastuzumab in combination with or followed by other anti-HER2 drugs (such as pertuzumab, lapatinib, and T-DM1). Until now, no new strategies or drugs are available for triple-negative and luminal-like BC.

MGMT promoter methylation status in brain metastases from colorectal cancer and corresponding primary tumors

BACKGROUND

Brain metastases (BM) from colorectal cancer are usually associated with poor prognosis. The aim of this retrospective study is to evaluate MGMT promoter methylation in BM and their corresponding primary colorectal cancer tumors.

MATERIALS & METHODS

MGMT promoter methylation status was assessed by pyrosequencing in 53 consecutive patients resected for BM. A concordance analysis between BM and matched primary tumor was performed in 39 cases.

RESULTS

MGMT methylation was found in 34 (64.2%) BM and in 25 corresponding primary tumors (64.1%). Median survival after neurosurgery was independent from MGMT promoter methylation (163 days for those with methylated MGMT versus 193 days for the unmethylated).

CONCLUSION

Epigenetic MGMT promoter methylation was common and the concordance between primary and secondary lesions was high.

A new nomogram for estimating survival in patients with brain metastases secondary to colorectal cancer

BACKGROUND

The prognosis of brain metastases (BM) in colorectal cancer (CRC) is extremely poor, but the incidence is increasing. The performance of existing prognostic classifications such as recursive partitioning analysis (RPA) and graded prognostic assessment (GPA) has never been evaluated in this specific setting. Moreover, the development of nomograms for estimating survival in such patients could be extremely helpful for treating physicians.

PATIENTS AND METHODS

Between 2000 and 2013, data from 227 patients with BM from CRC were collected at 8 Italian institutions. Overall survival (OS) was estimated with the Kaplan-Meier method and statistical comparison between curves was performed using the log-rank test. The discriminative ability for OS of RPA and GPA was assessed by the Harrell C-index from univariable Cox models. Putative prognostic factors for OS were also studied by multivariable Cox analysis, using the Harrell C index to evaluate the model discriminative ability. After a backward variable selection, a nomogram was developed to predict median survival time from individual patient- and tumor-related characteristics. The nomogram was externally validated on an independent series.

RESULTS

After a median follow-up of 59 months, fifty percent of patients were still at risk at 5 months. The C index was 0.594 and 0.607 for the RPA and GPA classifications, respectively. The C-index associated with the final multivariable Cox model used for developing the nomogram was 0.643; the favorable prognostic factors for survival were lower age (p=0.061), better Karnofsky performance status (p<0.001), supratentorial site of BM (p<0.001), and lower number of BM (p=0.035). The C index evaluated on the validation series was 0.733, even better than in the development series; also, the calibration of nomogram predictions was good.

CONCLUSION

The C-index associated to the nomogram model was slightly higher than that obtained for the RPA and GPA classifications. Most importantly, the very satisfactory results of nomogram validation on the external series, make us confident that our instrument may assist in prognostic assessment, treatment decision making, and enrollment into clinical trials.

From trial highlights to clinical context: putting American Society of Clinical Oncology gastrointestinal news into practice

Celebrating its tenth anniversary, the Gastrointestinal Cancers Symposium is a world class, international conference focused on research and multidisciplinary management of digestive tract malignancies, co-sponsored by the American Society of Clinical Oncology, the American Society for Radiation Oncology, the American Gastroenterological Association Institute and the Society of Surgical Oncology. This premium meeting was held from 24 to 26 January 2013 in San Francisco (CA, USA) and, in line with its principal mission, it sought to globally embrace prevention, screening, diagnostics, translational research and multimodal treatment, moving on three major anatomic tracks (upper gastrointestinal cancers, pancreatic/hepatobiliary tumors and colorectal malignancies). Over 2000 healthcare professionals gathered at this valuable 3day scientific event, which included plenary educational sessions and oral presentations of the top-rated abstracts, as well as the exposition of nearly 600 posters. This short article offers a summarized opinion-based overview of the most significant studies presented at the meeting that are likely to impact on clinical practice as well as new drug development, as best exemplified by the three most important messages of the whole meeting: the value of nanoparticle albumin-bound paclitaxel in metastatic pancreatic cancer; that of ramucirumab in second-line gastric cancer; and that of capecitabine and bevacizumab in elderly advanced colorectal cancer patients.

HER-2 Expression in Brain Metastases from Colorectal Cancer and Corresponding Primary Tumors: A Case Cohort Series

Brain metastases (BM) from colorectal cancer (CRC) are a rare but increasing event. Surgical resection of oligometastatic disease, including BM, may produce a survival benefit in selected patients. Previous studies described the HER-2 expression patterns in CRC patients, but its prognostic role still remains controversial. Information on the HER-2 expression in BM from CRC is currently lacking. Among the over 500 patients treated at our Department of Neurosurgery in the last 13 years (1999–2012), we identified a cohort of 50 consecutive CRC patients resected for BM. Clinical data were retrospectively reviewed using electronic hospital charts and surgical notes. Formalin-fixed, paraffin-embedded tissue samples were retrieved and histologically reviewed. HER-2 status was assessed on 4-μm sections by HerceptTest™, and scored by two pathologists according to gastric cancer HER-2 status guidelines. In score 2+ cases HER-2 gene copy number was analyzed by FISH, performed using the PathVysion HER-2 DNA Probe Kit. Median age at time of BM resection was 65 years (35–82); most patients were males (60%) with a good performance status. The majority of the BM were single (74%) and sited in the supratentorial area (64%); 2–4 lesions were diagnosed in 9 patients (18%), and >4 in 3 patients (6%). The rate of HER-2 positivity (defined as IHC score 3+ or IHC score 2+ and FISH gene amplification) was 8.1% for the primary CRC tumors and 12% for their corresponding BM. The concordance rate between primary tumors and matched BM was 89%. Median overall survival after neurosurgery was 6.5 months for HER-2 IHC score 0 vs. 4.6 months for HER-2 IHC score 1+/2+/3+; the difference was statistically significant (p = 0.01, Log-rank test). HER-2 positivity of our case cohort was low but comparable to literature. Concordance rate of HER-2 expression between BM and corresponding primary tumors is high and similar to those reported for breast and gastric cancers. Our data suggest a potential negative prognostic value of HER-2 expression in brain lesions from CRC.