Treatment-related mortality with bevacizumab in cancer patients: a meta-analysis

Targeted therapies in breast cancer: New challenges to fight against resistance

Breast cancer is the most common type of cancer found in women and today represents a significant challenge to public health. With the latest breakthroughs in molecular biology and immunotherapy, very specific targeted therapies have been tailored to the specific pathophysiology of different types of breast cancers. These recent developments have contributed to a more efficient and specific treatment protocol in breast cancer patients. However, the main challenge to be further investigated still remains the emergence of therapeutic resistance mechanisms, which develop soon after the onset of therapy and need urgent attention and further elucidation. What are the recent emerging molecular resistance mechanisms in breast cancer targeted therapy and what are the best strategies to apply in order to circumvent this important obstacle? The main scope of this review is to provide a thorough update of recent developments in the field and discuss future prospects for preventing resistance mechanisms in the quest to increase overall survival of patients suffering from the disease.

Use of Antihypertensive Drugs in Neoplastic Patients

The introduction of Vascular Endothelial Growth Factor (VEGF) signaling pathway inhibitor treatment has highlighted the role of the baseline activity of the VEFG system for blood pressure regulation. VEGF signaling pathway is associated with hypertension and proteinuria. Activation of the endothelin system, endothelial dysfunction and capillary rarefaction are among the underlying mechanisms possibly explaining the rise in blood pressure and, to some extent, also the renal injury. The hypertension induced by VEGF signaling pathway inhibition is, usually, responsive to treatment. Recommendations about the management of cardiovascular toxicity in patients receiving VEGF signaling pathway inhibitors include a formal cardiovascular risk assessment before initiation of VEGF signaling pathway inhibitor treatment, active monitoring of blood pressure and cardiac toxicity throughout treatment, with more frequent monitoring during the first cycles of therapy, given that marked and unpredictable blood pressure rises can occur early after treatment with a VEGF signaling pathway inhibitor, and aggressive management of blood pressure elevations and early symptoms and signs of cardiac toxicity to prevent clinically limiting complications. In patients with preexisting hypertension, the blood pressure target for initiating VEGF signaling pathway inhibitor treatment should be <140/90 mmHg. Blockers of the renin-angiotensin system and calcium channel antagonists are among the drugs to be preferably used in these clinical conditions.

Predicting serious complications in patients with cancer and pulmonary embolism using decision tree modelling: the EPIPHANY Index

Background:

Our objective was to develop a prognostic stratification tool that enables patients with cancer and pulmonary embolism (PE), whether incidental or symptomatic, to be classified according to the risk of serious complications within 15 days.

Methods:

The sample comprised cases from a national registry of pulmonary thromboembolism in patients with cancer (1075 patients from 14 Spanish centres). Diagnosis was incidental in 53.5% of the events in this registry. The Exhaustive CHAID analysis was applied with 10-fold cross-validation to predict development of serious complications following PE diagnosis.

Results:

About 208 patients (19.3%, 95% confidence interval (CI), 17.1–21.8%) developed a serious complication after PE diagnosis. The 15-day mortality rate was 10.1%, (95% CI, 8.4–12.1%). The decision tree detected six explanatory covariates: Hestia-like clinical decision rule (any risk criterion present vs none), Eastern Cooperative Group performance scale (ECOG-PS; <2 vs ⩾2), O₂ saturation (<90 vs ⩾90%), presence of PE-specific symptoms, tumour response (progression, unknown, or not evaluated vs others), and primary tumour resection. Three risk classes were created (low, intermediate, and high risk). The risk of serious complications within 15 days increases according to the group: 1.6, 9.4, 30.6% P<0.0001. Fifteen-day mortality rates also rise progressively in low-, intermediate-, and high-risk patients: 0.3, 6.1, and 17.1% P<0.0001. The cross-validated risk estimate is 0.191 (s.e.=0.012). The optimism-corrected area under the receiver operating characteristic curve is 0.779 (95% CI, 0.717–0.840).

Conclusions:

We have developed and internally validated a prognostic index to predict serious complications with the potential to impact decision-making in patients with cancer and PE.

Switching off malignant mesothelioma: exploiting the hypoxic microenvironment

Malignant mesotheliomas are aggressive, asbestos-related cancers with poor patient prognosis, typically arising in the mesothelial surfaces of tissues in pleural and peritoneal cavity. The relative unspecific symptoms of mesotheliomas, misdiagnoses, and lack of precise targeted therapies call for a more critical assessment of this disease. In the present review, we categorize commonly identified genomic aberrations of mesotheliomas into their canonical pathways and discuss targeting these pathways in the context of tumor hypoxia, a hallmark of cancer known to render solid tumors more resistant to radiation and most chemo-therapy. We then explore the concept that the intrinsic hypoxic microenvironment of mesotheliomas can be Achilles' heel for targeted, multimodal therapeutic intervention.

Risk of hyperglycemia attributable to everolimus in cancer patients: A meta-analysis

Everolimus has been used widely in cancer patients and is associated with the development of hyperglycemia. Due to confounding factors, its specific impact on hyperglycemia has not been well understood. We performed a meta-analysis of randomized controlled trials to determine the risk of hyperglycemia attributable to everolimus in cancer patients of varying tumor types.

MATERIAL AND METHODS

PubMed and American Society of Clinical Oncology conference abstracts up to June 2015 were systematically searched. Eligible studies included randomized controlled trials (RCTs) in which everolimus was compared to placebo in cancer patients with or without other agents. Heterogeneity tests were performed to examine between-study differences in hyperglycemia, and the incidence and relative risk of all- and high-grade hyperglycemia attributable to everolimus were determined using both random- or fixed-effects models.

RESULTS

A total of seven phase III and two phase II RCTs with various tumors, encompassing a total of 3879 cancer patients, were included in our analysis. Everolimus significantly increased the risk of all-grade (RR =2.60, 95% CI 2.03-3.31, p < 0.001) and high-grade (RR =3.0, 95% CI 1.72-5.23; p < 0.001) hyperglycemia. The incidences of all- and high-grade hyperglycemia attributable to everolimus were 6.8% (95% CI 3.4-13.2%) and 2.5% (95% CI 1.2-4.9%), respectively. The everolimus-specific risk of all-grade hyperglycemia varied significantly with tumor types (p < 0.001), with the highest incidence seen in renal cell carcinoma (RCC) (27.2%, 95% CI 22.2-32.8%) and the lowest in breast cancer (3.3%, 95% CI 1.3-8.2%). No significant variation was found between everolimus alone or everolimus in combination with other agents. Similar results were also found for the risk of high-grade hyperglycemia attributable to everolimus.

CONCLUSION

The specific risk of hyperglycemia attributable to everolimus may vary significantly with tumor types. Close monitoring should be given to patients at high risk, such as RCC.

Ramucirumab: Boon or bane

Ramucirumab is the recent addition to the list of monoclonal antibodies being tried in various malignancies. It has been approved in non-small cell lung cancer, gastric cancer and colorectal cancer after progression of one or more lines of therapies in the advanced setting. Though randomized trials have shown benefit, cost effectiveness is questionable. Moreover, the benefits shown are marginal, putting a question mark over its clinical usage. This review summarizes the latest evidence on ramucirumab.

Genotype-Guided Dosing Study of FOLFIRI plus Bevacizumab in Patients with Metastatic Colorectal Cancer

Purpose:UGT1A1*28 confers a higher risk of toxicity in patients treated with irinotecan. Patients with *1/*1 and *1/*28 genotypes might tolerate higher than standard doses of irinotecan. We aimed to identify the MTD of irinotecan in patients with metastatic colorectal cancer (mCRC) with *1/*1 and *1/*28 genotypes treated with FOLFIRI plus bevacizumab, and to determine whether bevacizumab alters irinotecan pharmacokinetics.Experimental Design: Previously untreated patients with mCRC (25 *1/*1; 23 *1/*28) were given FOLFIRI plus bevacizumab every 2 weeks. The irinotecan dose was escalated using a 3 + 3 design in each genotype group as follows: 260, 310, and 370 mg/m² The MTD was the highest dose at which <4/10 patients had a dose-limiting toxicity (DLT). Pharmacokinetics of irinotecan and SN-38 were measured on days 1 to 3 (without bevacizumab) and 15 to 17 (with bevacizumab).Results: For *1/*1 patients, 2 DLTs were observed among 10 patients at 310 mg/m², while 370 mg/m² was not tolerated (2 DLTs in 4 patients). For *1/*28 patients, 2 DLTs were observed among 10 patients at 260 mg/m², while 310 mg/m² was not tolerated (4 DLTs in 10 patients). Neutropenia and diarrhea were the most common DLTs. Changes in the AUCs of irinotecan and SN-38 associated with bevacizumab treatment were marginal.Conclusions: The MTD of irinotecan in FOLFIRI plus bevacizumab is 310 mg/m² for UGT1A1 *1/*1 patients and 260 mg/m² for *1/*28 patients. Bevacizumab does not alter the pharmacokinetics of irinotecan. The antitumor efficacy of these genotype-guided doses should be tested in future studies of patients with mCRC treated with FOLFIRI plus bevacizumab. Clin Cancer Res; 23(4); 918-24. ©2016 AACR.

Gastrointestinal perforation during regorafenib administration in a case with hepatic metastases of colon cancer

Although common side effects of regorafenib include hand-and-foot syndrome and diarrhoea, the incidence of gastrointestinal perforation is reportedly unknown. We describe our experience with the case of a 65-year-old woman treated with regorafenib as a third-line therapy for progressive caecal cancer with multiple hepatic metastases after 4 and 6 courses of systemic mFOLFOX6 + bevacizumab (BV) and FOLFIRI + BV chemotherapy, respectively. The patient used regorafenib for 32 days but visited our hospital with abdominal pain during the second course. She was diagnosed with acute appendicitis and treated conservatively with antibiotics. The abdominal findings did not improve, and a computed tomography evaluation on day 4 of hospitalization revealed free air lateral to the caecal tumour, liver surface, and epigastric region. The patient underwent same-day emergency surgery based on a diagnosis of gastrointestinal perforation with generalized peritonitis. Upon observing digestive fluid leakage into the peri-ileocaecal area and a 5-mm perforation in the appendix, the patient was diagnosed with peritonitis due to gastrointestinal perforation. Ileocaecal resection with D2 debridement was performed, and a colostomy was opened into the ileum and ascending colon. We conclude that our patient developed gastrointestinal perforation during regorafenib therapy and note that clinicians should be aware of this possible complication in patients with a history of prior treatment with BV.

A Phase Ib/II Study Evaluating the Combination of Weekly Docetaxel and Cisplatin Together with Capecitabine and Bevacizumab in Patients with Advanced Esophago-Gastric Cancer

Introduction

Current treatment options for advanced esophagogastric cancer (AEGC) are still unsatisfactory. The aim of this prospective phase Ib/II study was to evaluate the safety and efficacy of a novel regimen, AVDCX, consisting of weekly docetaxel and cisplatin together with capecitabine and bevacizumab, in AEGC.

Methods

Patients with AEGC received treatment with different dose levels of AVDCX (cisplatin and docetaxel 25–35 mg/m², days 1,8, capecitabine 1,600 mg/m² days 1–14, bevacizumab 7.5 mg/kg, day 1, Q:21 days). The study's primary objectives were to establish the recommended phase II doses of docetaxel and cisplatin in AVDCX (phase Ib part) and to determine the tumor response rate (phase II part).

Results

The study was closed early, after the accrual of 22 patients, due to accumulating toxicity-related deaths. The median age was 59 years and 77% of patients had gastric or gastroesophageal adenocarcinomas. Grade ≥3 adverse events were documented in 18 patients (82%), usually neutropenia (36%), fatigue (54%) or diarrhea (23%). There were three fatal toxicities (14%): mesenteric thromboembolism, gastric perforation and pancytopenic sepsis. The recommended phase II doses of cisplatin and docetaxel were determined to be 25 mg/m² and 30 mg/m², respectively. Twenty-one patients were evaluable for response: 12 (54%) had partial response (PR), 4 (18%) had stable disease (SD) and none had complete response (CR). Hence, the objective response rate (CR+PR) was 54% and the disease control rate (CR+PR+SD) was 72%. For the 17 patients treated at the MTD, the objective response rate was 41% and the disease control rate was 88%. The median overall survival (OS) for these patients was 13.9 months (range, 1.5–52.2 months) and the median progression-free survival was 7.6 months (range, 1.3–26.6 months). The 2-year OS rate reached 23.7%.

Conclusions

AVDCX was associated with a high rate of regimen related fatal adverse events and is not appropriate for further development in AEGC patients.

Trial Registration

ClinicalTrials.gov NCT00845884,

Use and misuse of common terminology criteria for adverse events in cancer clinical trials

BACKGROUND

Common Terminology Criteria for Adverse Events, Version 3.0 (CTCAE v3.0) were released in 2003 and have been used widely to report toxicity in publications or presentations describing cancer clinical trials. Here we evaluate whether guidelines for reporting toxicity are followed in publications reporting randomized clinical trials (RCTs) for cancer.

METHODS

Phase III RCTs evaluating systemic cancer therapy published between 2011 and 2013, were reviewed to identify eligible studies, which stated explicitly that CTCAE v3.0 was used to report toxicity. Each AE term and its grade were located in CTCAE v3.0 to determine if they fell within the guidelines provided in the explanatory file.

RESULTS

A total of 166 publications were included in this analysis. Criteria from CTCAE v3.0 were frequently used incorrectly. For example, CATEGORY names such as Metabolic were misreported as AEs in 19 trials, and inappropriate grades for AEs assigned frequently. For example, febrile neutropenia was graded 1 or 2 in 35 of 91 studies (38 %), but the minimum grade for this toxicity is 3. Alopecia was graded 3 or more in 19 of 77 studies (25 %), but the maximum is only grade 2.

CONCLUSION

The present study provides evidence of poor reporting of toxicity in clinical trials. The study provides a lower estimate for the misuse of AE terms and grades, and implies that other AE terms and grades that conform to CTCAE v3.0 guidelines may have been assigned incorrectly. Inaccurate reporting of toxicity in clinical trials can lead clinicians to make inappropriate treatment decisions.

International Experts Panel Meeting of the Italian Association of Thoracic Oncology on Antiangiogenetic Drugs for Non-Small Cell Lung Cancer: Realities and Hopes

Angiogenesis, one of the hallmarks of cancer, occurs when new blood vessels feed malignant cells, providing oxygen and nutrients, promoting tumor growth, and allowing tumor cells to escape into the circulation, thus leading to metastases. To date, a series of antiangiogenic drugs (either monoclonal antibodies or small molecules) have been approved by regulatory agencies for the treatment of advanced non-small cell lung cancer, and they are currently available for both first- and second-line therapy. The overall benefit of these drugs seems modest (although clearly significant), especially when administered as a single agent, and there is no clear consensus with regard to which patients should be candidates to receive these drugs across the different disease settings. From the biological perspective, angiogenesis represents a difficult and complex process to explore, given the interference with other key pathways and the dynamic evolution during the disease's history. Indeed, this process is complicated by the presence of multiple targets to hit, polymorphisms, hypoxia-dependent modifications, and epigenetics. These difficulties do not allow capture of which specific key pathways can be identified as biomarkers of efficacy so as to maximize to overall benefit of such drugs. An International Experts Panel Meeting was inspired by the absence of clear recommendations to address which patients should receive antiangiogenic drugs in the context of advanced non-small cell lung cancer so as to support decisions for clinical practice on a daily basis and determine priorities for future research. After a literature review and panelists consensus, a series of recommendations were defined to support decisions for the daily clinical practice and to indicate a potential road map for translational research.

Safety and complications of intravitreal injections performed in an Asian population in Singapore

There has been a rapid rise in the use of intravitreal injections, such as anti-vascular endothelial growth factor (anti-VEGF) agents, performed over the past few years for the treatment of ocular neovascular diseases. This study aims to review the systemic and ocular adverse events among patients treated at a tertiary eye center over a period of 8 years. A retrospective review of all intravitreal injections of anti-VEGF performed over an 8-year period at a tertiary eye care center in Singapore was done. We report the frequency of systemic and ocular adverse events and compared it among the various anti-VEGF agents. A total of 14 001 intravitreal injections were performed on 2225 patients from January 1, 2007 to December 31, 2014, and this included 9992 bevacizumab (71.4 %), 3306 ranibizumab (23.6 %) and 703 aflibercept (5.0 %) injections. Systemic complications related to treatment were 26 (1.17 %) deaths (from any cause), of which 11 (0.49 %) were from fatal thromboembolic events, 7 (0.31 %) non-fatal thromboembolic events and two (0.09 %) serious non-ocular hemorrhage. Ocular complications included one (0.007 %) endophthalmitis, three (0.021 %) traumatic cataracts, and one (0.007 %) retinal detachment. Rates of death and thromboembolic events were similar among ranibizumab (lucentis), bevacizumab (avastin) and aflibercept (Eylea). The systemic and ocular complications associated with intravitreal injections among Asian patients at a tertiary eye center are relatively low and reflect the safety of the treatments.

Post-bevacizumab Clinical Outcomes and the Impact of Early Discontinuation of Bevacizumab in Patients with Recurrent Malignant Glioma

Purpose

Bevacizumab±irinotecan is effective for treatment of recurrent malignant gliomas. However, the optimal duration of treatment has not been established.

Materials and Methods

Ninety-four consecutive patients with recurrent malignant glioma who were treated with bevacizumab at our institutions were identified. Patients who continued bevacizumab until tumor progression were enrolled in a late discontinuation (LD) group, while those who stopped bevacizumab before tumor progression were enrolled in an early discontinuation (ED) group. Landmark analyses were performed at weeks 9, 18, and 26 for comparison of patient survival between the two groups.

Results

Among 89 assessable patients, 62 (69.7%) and 27 (30.3%) patients were categorized as the LD and ED groups, respectively. According to landmark analysis, survival times from weeks 9, 18, and 26 were not significantly different between the two groups in the overall population. However, the LD group showed a trend toward increased survival compared to the ED group among responders. In the ED group, the median time from discontinuation to disease progression was 11.4 weeks, and none of the patients showed a definite rebound phenomenon. Similar median survival times after disease progression were observed between groups (14.4 weeks vs. 15.7 weeks, p=0.251). Of 83 patients, 38 (45.8%) received further therapy at progression, and those who received further therapy showed longer survival in both the LD and ED groups.

Conclusion

In recurrent malignant glioma, duration of bevacizumab was not associated with survival time in the overall population. However, ED of bevacizumab in responding patients might be associated with decreased survival.

Safety, Effectiveness, and Costs of Bevacizumab-Based Therapy in Southern Spain: A Real World Experience

To evaluate the safety and efficacy of bevacizumab in a broader patient population with solid tumors in the context of general clinical practice. Moreover, we quantified the economic impact and characterized the off-label use (OLU) of this agent in real-life prescribing practices.This is an open, retrospective, observational, real world study carried out at a regional Spanish hospital attending a population of 665,000 inhabitants. All of the patients receiving bevacizumab-containing therapy between January 2006 and February 2012 at the study hospital were included: no exclusion criteria were specified. All study variables were collected from available hospital records.The analysis comprised 240 episodes from 226 patients (male 41%; median age 57 years, 25% ≥65 years). Eighty cases (33%) of bevacizumab treatment were administered as first-line therapy. The median duration of bevacizumab treatment was 5.8 months (95% CI 5.1-6.6), without difference by age, line of treatment, or type of tumor. Typically bevacizumab-related toxicities included bleeding (25%), hypertension (5%), wound-healing complications (4%), gastrointestinal perforation (2%), and arterial thromboembolism (1%). Median progression-free survival was 7.5 months (95% CI 6.3-8.7) and median OS reached 13.1 months (95% CI 11.4-14.9). Bevacizumab increased the chemotherapy cost to 207% (from &OV0556;3,115,615 to &OV0556;9,552,405). Bevacizumab was prescribed off-label in 43% of episodes, amounting to &OV0556;3,586,420 (56% of bevacizumab total cost).The efficacy and safety profile of bevacizumab in routine clinical practice is consistent with results observed in prospective randomized clinical trials. OLU of this drug should be closely monitored.

Vascular Targeted Radioimmunotherapy for the Treatment of Glioblastoma

Glioblastoma is characterized by an aggressive and aberrant vascular network that promotes tumor progression and hinders effective treatment; the median survival is 16 mo despite standard-of-care therapies. There is a need to improve therapeutic options for this disease. We hypothesized that antibody targeting of the vascular endothelium of glioblastoma with cytotoxic short-range, high-energy α-particles would be an effective therapeutic approach.

METHODS

E4G10, an antibody directed at an epitope of monomeric vascular endothelium cadherin that is expressed in tumor neovasculature and on endothelial progenitor cells in the bone marrow, was labeled with α-particle-emitting ²²⁵Ac. Pharmacokinetic studies investigated the tissue distribution and blood clearance of the ²²⁵Ac-E4G10 radioimmunoconstruct in a transgenic Nestin-tumor virus A (Ntva) mouse model of high-grade glioblastoma. Histologic analysis was used to demonstrate local therapeutic effects in treated brain tumor sections. Radioimmunotherapy with ²²⁵Ac-E4G10 was performed in Ntva mice to assess overall survival alone and in combination with temozolomide, the standard-of-care chemotherapeutic agent.

RESULTS

²²⁵Ac-E4G10 was found to accumulate in tissues expressing the target antigen. Antivascular α-particle therapy of glioblastoma in the transgenic Ntva model resulted in significantly improved survival compared with controls and potent control of tumor growth. Adding the chemotherapeutic temozolomide to the treatment increased survival to 30 d (vs. 9 d for vehicle-treated animals). Histologic analyses showed a remodeled glioblastoma vascular microenvironment.

CONCLUSION

Targeted α-particle antivascular therapy is shown for the first time to be effective in increasing overall survival in a solid tumor in a clinically relevant transgenic glioblastoma mouse model.

Retrospective analysis of bevacizumab-induced hypertension and clinical outcome in patients with colorectal cancer and lung cancer

Bevacizumab(Avastin^®), a humanized therapeutic monoclonal antibody that targets vascular endothelial growth factor, is widely used in cancer treatment. Patients who are treated with bevacizumab have an increased risk of developing systemic hypertension. However, the relationship between bevacizumab‐induced hypertension and clinical outcome remains unclear. We aimed to evaluate the effect of bevacizumab‐induced hypertension in terms of prognosis in patients with colorectal cancer and non‐small cell lung cancer. The study included 632 patients, 317 patients with non‐small cell lung cancer and 315 patients with colorectal cancer. All patients were treated with bevacizumab in combination with standard chemotherapy protocols, between April 2007 and December 2014. Blood pressure was measured before each treatment cycle. In the patient group with colorectal cancer, treated with bevacizumab, Grade 2–3 hypertension was present in 27.6%. In hypertensive patients with colorectal cancer, median overall survival was 42.6 months, compared with 20.6 months for normotensive patients in this group (P = 0.00071). In the patient group with non‐small cell lung cancer, treated with bevacizumab, Grade 2–3 hypertension was present in 20.5%. In hypertensive patients with non‐small cell lung cancer, median overall survival was 43.0 months, compared with 26.3 months for normotensive patients in this group (P = 0.00451). Patients who developed hypertension during treatment with bevacizumab for colorectal cancer and non‐small cell lung cancer had significantly prolonged overall survival when compared with normotensive patients. Bevacizumab‐induced hypertension may represent a biomarker for clinical benefit in cancer patients treated with bevacizumab.

The Best. First. Anti-EGFR before anti-VEGF, in the first-line treatment of RAS wild-type metastatic colorectal cancer: from bench to bedside

BACKGROUND

Since 2013, informative trials exploring the optimal use of available biologic agents in the first-line setting of metastatic colorectal cancer (mCRC) have been presented. These trials have opened a stimulating debate on the biological effect that first-line therapies may have on subsequent lines of treatment even long after the first-line progression.

MATERIALS AND METHODS

We reviewed available preclinical and clinical data on the effect of different sequences of the biological drugs approved for use in mCRC patients. The importance of molecular selection of patients based on RAS mutational status and toxicity and quality-of-life issues were also analyzed.

RESULTS

Convincing evidence exists on the optimal therapeutic effect obtained by using anti-EGFR agents in first-line treatment before anti-VEGF agents. On the contrary, up-front anti-VEGF agents' use seems to determine biological changes that increase the risk of acquired resistance to subsequent EGFR inhibitors. This hypothesis is confirmed by the scarce evidence of EGFR inhibitor activity in second-line treatment. Such a therapeutic optimum is subject to a fine molecular selection based on RAS mutational status.

CONCLUSION

There is accumulating evidence suggesting that, after precise and well-established molecular selection, anti-EGFR agents deliver their maximum efficacy in mCRC patients when given early in the treatment strategy. Their toxicity profile seems manageable under the supervision of experienced physicians. Large randomized trials prospectively confirming the impact of different sequencing strategies are eagerly awaited.

HSPA12B: a novel facilitator of lung tumor growth

Lung tumor progression is regulated by proangiogenic factors. Heat shock protein A12B (HSPA12B) is a recently identified regulator of expression of proangiogenic factors. However, whether HSPA12B plays a role in lung tumor growth is unknown. To address this question, transgenic mice overexpressing HSPA12B (Tg) and wild-type littermates (WT) were implanted with Lewis lung cancer cells to induce lung tumorigenesis. Tg mice showed significantly higher number and bigger size of tumors than WT mice. Tg tumors exhibited increased angiogenesis and proliferation while reduced apoptosis compared with WT tumors. Interestingly, a significantly enhanced upregulation of Cox-2 was detected in Tg tumors than in WT tumors. Also, Tg tumors demonstrated upregulation of VEGF and angiopoietin-1, downregulation of AKAP12, and increased eNOS phosphorylation compared with WT tumors. Celecoxib, a selective Cox-2 inhibitor, suppressed the HSPA12B-induced increase in lung tumor burden. Moreover, celecoxib decreased angiogenesis and proliferation whereas increased apoptosis in Tg tumors. Additionally, celecoxib reduced angiopoietin-1 expression and eNOS phosphorylation but increased AKAP12 levels in Tg tumors. Our results indicate that HSPA12B stimulates lung tumor growth via a Cox-2-dependent mechanism. The present study identified HSPA12B as a novel facilitator of lung tumor growth and a potential therapeutic target for the treatment of lung cancer.

A Systemic Lupus Erythematosus Patient With Febrile Neutropenia Developing After Intraocular Administration of Bevacizumab

In this article, we report a case with febrile neutropenia occurring after implementation of intraocular bevacizumab. A 60-year-old female patient who had received intravitreal bevacizumab applied to hospital for oral lesions accompanying fever and neutropenia. In spite of empiric antibiotherapy, patient's clinical condition did not improve. Her sputum culture yielded Stenotrophomonas maltophilia. Trimethoprim/ sulfamethoxazole and levofloxacin were commenced according to antibiogram. In immunologic evaluation, antinuclear antibodies and anti-double stranded deoxyribonucleic acid were positive as compatible with systemic lupus erythematosus. After proper antibiotic treatment, patient's clinical symptoms resolved. Development of severe neutropenia after procedures which are not expected to create systemic adverse effects should bring to mind underlying immunosuppressive diseases such as systemic lupus erythematosus.

Safety of bevacizumab in clinical practice for recurrent ovarian cancer: A retrospective cohort study

The poor outcome of patients with recurrent ovarian cancer constitutes a continuous challenge for decision-making in clinical practice. In this setting, molecular targets have recently been identified, and novel compounds are now available. Bevacizumab has been introduced for the treatment of patients with ovarian cancer and is, to date, the most extensively investigated targeted therapy in this setting. However, potential toxicities are associated with the use of this monoclonal antibody. These toxicities have been reported in clinical trials, and can also be observed outside of trials. As limited data is currently available regarding the safety of bevacizumab treatment in daily clinical practice, the current retrospective study was designed to evaluate this. Data from 156 patients with recurrent ovarian cancer who had received bevacizumab treatment between January 2006 and June 2009 were retrospectively identified from the institutional records of five French centers. In contrast to clinical trials, the patients in the present study were not selected and had a heterogeneous profile according to their prior medical history, lines of treatment prior to bevacizumab introduction and number of relapses. The results first confirm the effect of heavy pretreatment on the occurrence of serious and fatal adverse events in clinical practice, as previously reported for clinical trials and for other retrospective cohort studies. Importantly, the data also demonstrates, for the first time, that medical history of hypertension is an independent predictive risk factor for the development of high-grade hypertension during bevacizumab treatment. These results thus suggest that treating physicians must consider all risk factors for managing bevacizumab toxicity prior to its introduction. Such risk factors include the time of bevacizumab introduction, a patient's history of hypertension and a low incidence of pre-existing obstructive disease.

Involvement of ion channels and transporters in carcinoma angiogenesis and metastasis

Angiogenesis is a finely tuned process, which is the result of the equilibrium between pro- and antiangiogenic factors. In solid tumor angiogenesis, the balance is highly in favor of the production of new, but poorly functional blood vessels, initially intended to provide growing tumors with nutrients and oxygen. Among the numerous proteins involved in tumor development, several types of ion channels are overexpressed in tumor cells, as well as in stromal and endothelial cells. Ion channels thus actively participate in the different hallmarks of cancer, especially in tumor angiogenesis and metastasis. Indeed, from their strategic localization in the plasma membrane, ion channels are key operators of cell signaling, as they sense and respond to environmental changes. This review aims to decipher how ion channels of different families are intricately involved in the fundamental angiogenesis and metastasis hallmarks, which lead from a nascent tumor to systemic dissemination. An overview of the possible use of ion channels as therapeutic targets will also be given, showing that ion channel inhibitors or specific antibodies may provide effective tools, in the near future, in the treatment of carcinomas.

Arming embolic beads with anti-VEGF antibodies and controlling their release using LbL technology

Transarterial chemoembolization (TACE) is used to treat various types of hypervascular tumors such as hepatocellular carcinoma and renal cancer. However, embolization and blocking of blood vessels nourishing a tumor mass evokes an angiogenic response due to the secretion of vascular endothelial growth factor (VEGF), which results in the formation of new blood vessels and eventually limitation in therapeutic efficacy. The presented work investigates the feasibility of loading the clinically used embolic beads (DC Bead®) with Bevacizumab (BEV), an anti-VEGF antibody, and control its release kinetics via Layer-by-Layer (LbL) coating. This strategy has the aim to achieve high, localized and sustained concentrations of BEV at the tumor site and reduce drug exposure in the systemic circulation. High loading of BEV on lyophilized beads of about 76mg BEV/bead vial was achieved. LbL coating was carried out by depositing alternating layers of the biocompatible polymers alginate and poly-L-lysine. Coating was proven successful by monitoring the reversal of zeta potential after addition of each layer. Morphological changes of the bead surface before and after coating were illustrated using SEM imaging. Moreover, release profiles from different formulations were studied and results showed that optimizing the number of deposited layers effectively slows the release of BEV for three days. Activity of released BEV was studied in different 2D and 3D cell based assays. Released BEV fractions showed comparable activity to fresh BEV solution used as control after 3days. In conclusion, our results suggest the opportunity for loading anti-VEGF antibodies on commercially available embolic beads to increase the efficacy of TACE of hypervascular tumors.

Low-event-rate meta-analyses of clinical trials: implementing good practices

Meta‐analysis of clinical trials is a methodology to summarize information from a collection of trials about an intervention, in order to make informed inferences about that intervention. Random effects allow the target population outcomes to vary among trials. Since meta‐analysis is often an important element in helping shape public health policy, society depends on biostatisticians to help ensure that the methodology is sound. Yet when meta‐analysis involves randomized binomial trials with low event rates, the overwhelming majority of publications use methods currently not intended for such data. This statistical practice issue must be addressed. Proper methods exist, but they are rarely applied. This tutorial is devoted to estimating a well‐defined overall relative risk, via a patient‐weighted random‐effects method. We show what goes wrong with methods based on ‘inverse‐variance’ weights, which are almost universally used. To illustrate similarities and differences, we contrast our methods, inverse‐variance methods, and the published results (usually inverse‐variance) for 18 meta‐analyses from 13 Journal of the American Medical Association articles. We also consider the 2007 case of rosiglitazone (Avandia), where important public health issues were at stake, involving patient cardiovascular risk. The most widely used method would have reached a different conclusion. © 2016 The Authors. Statistics in Medicine published by John Wiley & Sons Ltd.

A Rupture of a Lung Metastatic Lesion of Colon Cancer, Leading to Pneumothorax Caused by Bevacizumab

The patient was a 57-year-old man who was diagnosed with multiple lung metastases of sigmoid colon cancer. The patient developed progressive disease after 8 courses of bevacizumab + capecitabine and oxaliplatin therapy, therefore, bevacizumab + irinotecan, leucovorin, and 5-fluorouracil therapy was started. During the fifth course, he experienced pain on the left side of his chest. On computed tomography, bleeding from the pulmonary metastatic lesions was suspected. Two days later, a pneumothorax was detected. Although several cases of pneumothorax induced by bevacizumab have been reported, this case is the first documentation that bevacizumab caused a rupture of the lung metastatic lesion, leading to a pneumothorax.

Use of Vacuum-assisted closure in management of open abdominal wound with multiple enterocutaneous fistulae during chemotherapy: A case report

INTRODUCTION

Vacuum-assisted closure (VAC) is useful for treating complex wounds because it promotes granulation. In the present report, a successful case of VAC used for an open abdominal wound with enterocutaneous fistulae after multiple intestinal perforations during chemotherapy is described.

PRESENTATION OF CASE

A 73-year-old man was admitted to our hospital with severe abdominal pain. He underwent surgical resection for ascending colon cancer 4 years ago and was administered chemotherapy with bevacizumab for recurrence. Physical examination and computed tomography revealed perforation of the intestine, and an emergency operation was performed. Following this procedure, other intestinal perforations occurred, resulting in an open abdominal wound at postoperative day (POD) 10. To isolate enteric contents and promote granulation, VAC was applied to the abdominal wound with enterocutaneous fistulae. Oral intake started at POD 21 and the wound size became smaller. Further, an ostomy bag was directly attached to the most oral perforation site. The patient recovered from life-threatening events without severe infection and was transferred to another hospital close to his home at POD 180.

DISCUSSION

Gastrointestinal perforation is known to be one of the fatal adverse events of bevacizumab. In this case four gastrointestinal perforations were observed. Isolation of enteric contents is important to heal the wound and VAC is an effective therapy for the management of open abdominal wounds even with enterocutaneous fistulae.

CONCLUSION

Innovative VAC use for the management of open abdominal wounds can improve the nutritional status and overall wound healing of the patient.

Abdominal surgical emergencies in patients with advanced cancer

Abdominal emergency in an advanced oncologic setting is defined as an acute life-threatening abdominal pathology in a patient with incurable cancer. These include bowel obstruction, infections and, more rarely, hemorrhage. To benefit the patient, surgery should both increase the survival and improve the quality of life. These two goals are of equal importance and must be achieved together. This is difficult because these patients are frail, often malnourished and have a poor performance status. They also have a high risk of post-operative morbidity and mortality, a major risk of symptom recurrence and a limited life expectancy. For patients near the end-of-life, a therapeutic decision for surgical intervention must respect ethical and legal standards. This review reports the surgical outcomes and median survival of these patients, specifies rules that must be known and respected, and presents non-operative interventional alternatives.

Radio-Immunotherapy-Induced Immunogenic Cancer Cells as Basis for Induction of Systemic Anti-Tumor Immune Responses - Pre-Clinical Evidence and Ongoing Clinical Applications

Radiotherapy (RT) primarily aims to locally destroy the tumor via the induction of DNA damage in the tumor cells. However, the so-called abscopal, namely systemic and immune–mediated, effects of RT move over more and more in the focus of scientists and clinicians since combinations of local irradiation with immune therapy have been demonstrated to induce anti-tumor immunity. We here summarize changes of the phenotype and microenvironment of tumor cells after exposure to irradiation, chemotherapeutic agents, and immune modulating agents rendering the tumor more immunogenic. The impact of therapy-modified tumor cells and damage-associated molecular patterns on local and systemic control of the primary tumor, recurrent tumors, and metastases will be outlined. Finally, clinical studies affirming the bench-side findings of interactions and synergies of radiation therapy and immunotherapy will be discussed. Focus is set on combination of radio(chemo)therapy (RCT) with immune checkpoint inhibitors, growth factor inhibitors, and chimeric antigen receptor T-cell therapy. Well-deliberated combination of RCT with selected immune therapies and growth factor inhibitors bear the great potential to further improve anti-cancer therapies.

Risk of Adverse Vascular Events in Newly Diagnosed Glioblastoma Multiforme Patients Treated with Bevacizumab: a Systematic Review and Meta-Analysis

Previous evidence suggests that the humanized anti-VEGF antibody bevacizumab increases thrombosis risk in glioma patients. Here, we comprehensively assessed the risk of adverse vascular events in adult glioma patients receiving bevacizumab therapy. Systematic searches of MEDLINE, EMBASE, and the Cochrane Library were conducted to find prospective phase II/III clinical trials on adult bevacizumab-treated glioma patients and non-bevacizumab-treated controls that reported data on adverse vascular events. Four high-quality trials were finally included in the systematic review, scoring greater than or equal to 7/8 on the Newcastle-Ottawa Scale. Three trials provided sufficient data for four meta-analytical comparisons between bevacizumab-treated and control groups of newly diagnosed glioblastoma multiforme (GBM) patients: all-cause discontinuation, thrombocytopenia, deep vein thrombosis (DVT), and pulmonary embolism. None of these adverse outcomes were found to be significantly different between bevacizumab-treated and control groups (P > 0.05); however, there was a trend toward significance with regard to bevacizumab therapy and the risk of pulmonary embolism (P = 0.07). As there was a trend toward significance with regard to bevacizumab therapy and the risk of pulmonary embolism, anticoagulation may be advisable in certain newly diagnosed adult GBM patients who display a history of thromboembolism and/or more serious risk factors for thromboembolic events.

Anti-epidermal or anti-vascular endothelial growth factor as first-line metastatic colorectal cancer in modified Glasgow prognostic score 2' patients

BACKGROUND

In metastatic colorectal cancer, the modified Glasgow prognostic score (mGPS) has been approved as an independent prognostic indicator of survival. No data existed on poor prognosis patients treated with molecular-targeted agents.

METHODS

From January 2007 to February 2012, patients with metastatic colorectal cancer and poor predictive survival score (mGPS = 2), treated with 5-fluorouracil-based chemotherapy in addition to an anti-epidermal growth factor receptor (EGFR) or anti-vascular epidermal growth factor (VEGF) therapy, were included to assess the interest of targeted therapy within mGPS = 2' patients.

RESULTS

A total of 27 mGPS = 2' patients were included and received a 5-fluorouracil-based systemic chemotherapy in addition to an anti-EGFR treatment (cetuximab; n = 18) or an anti-VEGF treatment (bevacizumab; n = 9). Median follow-up was 12.1 months (interquartile range 4.9-22). Patients were Eastern Cooperative Oncology Group (ECOG) Performance Status 1, 2, and 3 in 66% (n = 18), 26% (n = 7), and 8% (n = 2), respectively. Comparing anti-EGFR and anti-VEGF groups, median progression-free survival was 3.9 and 15.4 months, respectively, and was significantly different (P = 0.046). Conversely, the median overall survival was not significantly different between the two groups (P = 0.15).

CONCLUSION

Our study confirmed the poor survival of patients with mGPS = 2 despite the use of targeted therapy and identified the superiority of an anti-VEGF treatment in progression-free survival, without a significant benefit in the overall survival compared with the anti-EGFR therapy. Our results deserved confirmation by a prospective clinical trial.

Toward a Cancer Drug of Fungal Origin

Although fungi produce highly structurally diverse metabolites, many of which have served as excellent sources of pharmaceuticals, no fungi-derived agent has been approved as a cancer drug so far. This is despite a tremendous amount of research being aimed at the identification of fungal metabolites with promising anticancer activities. This review discusses the results of clinical testing of fungal metabolites and their synthetic derivatives, with the goal to evaluate how far we are from an approved cancer drug of fungal origin. Also, because in vivo studies in animal models are predictive of the efficacy and toxicity of a given compound in a clinical situation, literature describing animal cancer testing of compounds of fungal origin is reviewed as well. Agents showing the potential to advance to clinical trials are also identified. Finally, the technological challenges involved in the exploitation of fungal biodiversity and procurement of sufficient quantities of clinical candidates are discussed, and potential solutions that could be pursued by researchers are highlighted.

Management of pulmonary toxicity associated with targeted anticancer therapies

INTRODUCTION

Targeted anticancer therapies act by interfering with defined molecular entities and/or biologic pathways. Because of their more specific mechanism of action, adverse events (AEs) on healthy tissues are intended to be minimal, resulting in a different toxicity profile from that observed with conventional cytotoxic chemotherapy. Pulmonary AEs are rare but potentially life-threatening and it is, therefore, critical to recognize early on and manage appropriately.

AREAS COVERED

In this review, we aim to offer an overview of both more frequent and rare pulmonary AEs caused by targeted anticancer therapies and discuss possible treatment algorithms. Anti-vascular endothelial growth factor, anti-human epidermal growth factor receptor and anti-CD20 therapy will be reviewed, as well as immune checkpoint inhibitors, anaplastic lymphoma kinase inhibitors and mammalian target of rapamycin inhibitors.

EXPERT OPINION

Novel agents used in the treatment of cancer have specific side-effects, the result of allergic reactions, on-target and off-target effects. Clinical syndromes associated with pulmonary toxicity vary from bronchospasms, hypersensitivity reactions, pneumonitis, acute respiratory distress, lung bleeding, pleural effusion to pneumothorax. Knowledge of risk factors, a high index of suspicion and a complete diagnostic work-up are essential for limiting the risk of these events becoming life threatening. The development of treatment algorithms is extremely helpful in managing these events. It is probable that these toxicities will be even more frequent with the introduction of combination therapies with the obvious challenge of discerning the responsible agent.

Is more not better?: combination therapies in colorectal cancer treatment

The treatment of colorectal cancer has evolved dramatically in recent years with the availability of new chemotherapeutic agents and inhibitors of the vascular endothelial growth factor- and epidermal growth factor-signaling pathways. The incremental benefit of each individual line of therapy for advanced disease is relatively small. Advances in our ability to select patients should improve the cost-effectiveness of our treatment strategies (avoiding unnecessary toxicity in the patients who are unlikely to benefit and accepting the potential for adverse events in the patients who stand to benefit the most from a given regimen).

Copper improves the anti-angiogenic activity of disulfiram through the EGFR/Src/VEGF pathway in gliomas

Disulfiram (DSF) possesses anticancer activity by inducing apoptosis in vitro and in vivo in a copper (Cu)-dependent manner. DSF also potently inhibits angiogenesis, but the effect of Cu on this anti-angiogenic activity is unknown. Here we show that DSF inhibits the proliferation, migration, invasion, adhesion and complex tube formation of human umbilical vascular endothelial cells (HUVECs). Aortic ring assays and Matrigel plug assays revealed that DSF significantly inhibited the formation of microvessels. Importantly, Cu improved the anti-angiogenic activity of DSF in all these assays, while copper alone had no effect. DSF/Cu treatment of U87 human glioblastoma cells resulted in suppression of VEGF secretion through the EGFR/c-Src/VEGF pathway. Reduction of EGFR phosphorylation disables recruitment of multiple Src homology 2 (SH2) domains, resulting in transcriptional down-regulation of VEGF. The role of EGFR/c-Src/VEGF pathway was further confirmed by using specific inhibitor, which significantly improved the anti-angiogenic activity of DSF/Cu. DSF/Cu also exerted increased anti-tumor effects on subcutaneous and intracerebral U87 xenograft models by reducing microvessel density (MVD) and VEGF expression. These results indicate that Cu improves the anti-angiogenic activity of DSF by targeting the EGFR/Src/VEGF signaling pathway, thus providing a rationale for the use of DSF/Cu rather than DSF alone as an angiogenesis inhibitor in clinical applications.

CXCL7-induced macrophage infiltration in lung tumor is independent of CXCR2 expression: CXCL7-induced macrophage chemotaxis in LLC tumors

Chemokines play diverse roles in modulating the immune response during tumor development. Levels of CXC chemokine ligand 7 (CXCL7) protein vary during tumorigenesis, and the evidence suggests that this chemokine serves as a novel biomarker of early-stage lung cancer. We investigated the effect of CXCL7 gene expression on the infiltration of myeloid cells into the tumor microenvironment in Lewis lung carcinoma (LLC). Tumors established from LLC cells overexpressing CXCL7 (CXCL7-LLC tumors) increased the infiltration of CD206(+) M2 macrophages at the early stages of tumorigenesis. This infiltration was independent of CXCR2 expression on either tumor cells or macrophages. CXCL7-LLC tumors developed faster than control-LLC tumors (IRES-LLC tumor) did. The extent of CD4(+) T cell, CD8(+) T cell, and natural killer T cell infiltration was similar between the two tumor groups. Our findings suggest that CXCL7 attracts macrophages especially at the tumor site and may accelerate lung tumor development in the early stages.

Intraperitoneal Vascular Endothelial Growth Factor: A Prognostic Factor and the Potential for Intraperitoneal Bevacizumab Use in Peritoneal Surface Malignancies

INTRODUCTION

Intraperitoneal (IP) vascular endothelial growth factor (VEGF) levels have been shown to vary in the peritoneal cavity of patients with peritoneal surface malignancies. Our purpose was to correlate levels of IP VEGF with overall and disease-free survival to identify whether IP VEGF can be used to prognosticate patients and the possible role of IP bevacizumab.

METHODS

From February to October 2012, 97 consecutive patients with peritoneal carcinomatosis were treated with cytoreductive surgery and hyperthermic intraperitoneal chemotherapy. Intravenous (IV) VEGF levels were taken before surgery, whereas IP VEGF levels were taken at various time points during and after surgery.

RESULTS

Median follow-up was 19.48 months. On univariate analysis, a lower IP VEGF taken just after incision (T1) was associated with improved overall (P = 0.0004) and disease-free survival (P = 0.0006) at 2 years. A lower T1/IV VEGF ratio also was associated with improved overall (P = 0.004) and disease-free survival (P = 0.0051). On multivariate analysis, a lower T1 was associated with improved overall survival, whereas a lower T1/IV VEGF was associated with improved disease-free survival. On subset analysis, these two variables were associated with improved survival in colorectal cancers.

CONCLUSIONS

A lower IP VEGF level prior to surgery is associated with improved survival. The use of preoperative intraperitoneal bevacizumab for patients with a heavy disease load should be considered, especially in colorectal cancers.

Current intravitreal pharmacologic therapies for diabetic macular edema

INTRODUCTION

Diabetic retinopathy is the leading cause of vision loss in working-age adults; it is a highly prevalent cause of vision loss overall and has a potent impact on the quality of life in those with diabetes mellitus and public health in general. Diabetic macular edema (DME) is the most common cause of vision loss from diabetic retinopathy. In patients with diabetes mellitus, chronic hyperglycemia leads to activation of the inflammatory cascade and retinal capillary damage that result in microaneurysm formation in the retina. In addition to the possibility of associated ischemia, microaneurysms are hyperpermeable; the resultant loss of the blood-retinal barrier leads to vision loss if consequent edema involves the center of the fovea. The standard of DME therapy for >25 years was focal laser photocoagulation applied to or near the microaneurysms. However, results from clinical trials of intravitreal vascular endothelial growth factor (VEGF) blockers and corticosteroids for the treatment of DME have led to a dramatic paradigm shift away from laser therapy to primary treatment with these pharmacologic agents.

METHODS

Medline literature search of approaches for treating DME.

RESULTS

Intravitreal pharmacologic treatments with anti-VEGF agents and corticosteroids have recently been shown to be superior to laser treatment of DME.

CONCLUSION

The existence of pharmacologic treatment of DME, shown to be superior to laser monotherapy, has created a seismic change in the approach of treatment of these patients. This review provides a summary of the therapies and the rationale regarding the current pharmacologic therapy of DME.

Thrombotic events in metastatic colorectal cancer patients treated with leucovorin, fluorouracil and irinotican (FOLFIRI) plus bevacizumab

OBJECTIVE

To determine the incidence and risk factors for thrombotic events (TEs) in patients with metastatic colorectal cancer (mCRC) who received bevacizumab (BV) and FOLFIRI (leucovorin, fluorouracil and irinotican) compared to FOLFIRI alone.

METHODS

Single institution retrospective study of 450 mCRC patients who received either BV plus FOLFIRI or FOLFIRI alone between April 2004 and August 2012. Demographics, TE risk factors, and treatment data were abstracted from patients' records. Multivariate analysis was used to identify factors that contributed to thromboembolism.

RESULTS

Two-hundred-sixty-one mCRC patients received BV plus FOLFIRI [64.8% males, mean body mass index (BMI) of 27.6] compared to 189 control patients who received FOLFIRI alone (61.9% males, BMI 27.2). The incidence of TEs was 14.9% in the BV plus FOLFIRI group, compared to 15.9% in the control group. Multivariate analysis controlling for age, BMI, gender, malignancy, metastatic sites, line of treatment, and risk factors did not suggest a significant increase in the risk of TE with the addition of BV (OR =0.83 95% CI: 0.40-1.70; P=0.602). No difference in the site of TEs was observed between the treatment groups. The only statistically significant risk factor for thrombosis in the FOLFIRI plus BV group was increased BMI (OR =1.05; 95% CI: 1.01-1.10; P=0.01).

CONCLUSIONS

This study does not support a significant increase in the risk of TE in patients with mCRC who received BV in addition to FOLFIRI. Increased BMI may be a risk factor for thrombosis in patients treated with BV.

Review of systemic therapies for locally advanced and metastatic rectal cancer

Rectal cancer, along with colon cancer, is the second leading cause of cancer-related deaths in the U.S. Up to a quarter of patients have metastatic disease at diagnosis and 40% will develop metastatic disease. The past 10 years have been extremely exciting in the treatment of both locally advanced and metastatic rectal cancer (mRC). With the advent of neoadjuvant chemoradiation, increased numbers of patients with locally advanced rectal cancer (LARC) are surviving longer and some are seeing their tumors shrink to sizes that allow for resection. The advent of biologics and monoclonal antibodies has propelled the treatment of mRC further than many could have hoped. Combined with regimens such as FOLFOX or FOLFIRI, median survival rates have been increased to an average of 23 months. However, the combinations of chemotherapy regimens seem endless for rectal cancer. We will review the major chemotherapies available for locally advanced and mRC as well as regimens currently under investigation such as FOLFOXIRI. We will also review vascular endothelial growth factor (VEGF) and epidermal growth factor receptor (EGFR) inhibitors as single agents and in combination with traditional chemotherapy regimens.

The fate of chemoresistance in triple negative breast cancer (TNBC)

BACKGROUND

Treatment options for women presenting with triple negative breast cancer (TNBC) are limited due to the lack of a therapeutic target and as a result, are managed with standard chemotherapy such as paclitaxel (Taxol®). Following chemotherapy, the ideal tumour response is apoptotic cell death. Post-chemotherapy, cells can maintain viability by undergoing viable cellular responses such as cellular senescence, generating secretomes which can directly enhance the malignant phenotype.

SCOPE OF REVIEW

How tumour cells retain viability in response to chemotherapeutic engagement is discussed. In addition we discuss the implications of this retained tumour cell viability in the context of the development of recurrent and metastatic TNBC disease. Current adjuvant and neo-adjuvant treatments available and the novel potential therapies that are being researched are also reviewed.

MAJOR CONCLUSIONS

Cellular senescence and cytoprotective autophagy are potential mechanisms of chemoresistance in TNBC. These two non-apoptotic outcomes in response to chemotherapy are inextricably linked and are neglected outcomes of investigation in the chemotherapeutic arena. Cellular fate assessments may therefore have the potential to predict TNBC patient outcome.

GENERAL SIGNIFICANCE

Focusing on the fact that cancer cells can bypass the desired cellular apoptotic response to chemotherapy through cellular senescence and cytoprotective autophagy will highlight the importance of targeting non-apoptotic survival pathways to enhance chemotherapeutic efficacy.

Pharmacotherapy for recurrent ovarian cancer: current status and future perspectives

Several 'lines of therapy' that utilize cytotoxic agents and are driven by platinum-free intervals are the current standard of care for patients with recurrent ovarian cancer. For patients with platinum-resistant disease, single agent chemotherapy (pegylated liposomal doxorubicin, topotecan, gemcitabine or weekly paclitaxel) is the standard of care. For patients with platinum-sensitive disease, combination chemotherapy (carboplatin plus paclitaxel, pegylated liposomal doxorubicin or gemcitabine) is the standard of care. In addition, antiangiogenic therapy using bevacizumab is an established option. Future directions could include 'lines of therapy' with biologic agents driven by specific biologic targets. Data from antiangiogenic agents (trebananib, pazopanib and cediranib), antifolate drugs (farletuzumab and vintafolide), poly(ADP-ribose) polymerase inhibitors (olaparib and veliparib), mTOR inhibitors (everolimus and temsirolimus) and immune editing agents (nivolumab) have been summarized in this review.

Intravitreal anti-VEGF therapy as a treatment for retinopathy of prematurity: what we know after 7 years

The authors review published clinical case reports, case series, and clinical trials evaluating the use of anti-vascular endothelial growth factor (VEGF) medications for the primary or adjunctive treatment of retinopathy of prematurity (ROP). A literature search of peer reviewed reports on PubMed was performed. More than 50 pertinent peer-reviewed publications between 2006 and 2014 were selected to be included in this review and are summarized in this report. There is a growing body of literature on the use of anti-VEGF therapy as a treatment for ROP, predominately in the form of case reports and small case series. Adverse effects from anti-VEGF treatment for ROP have been reported, but with limited follow-up time. The use of anti-VEGF as a treatment for ROP remains off-label.

Bleeding after bevacizumab treatment in patients with metastatic colorectal cancer

AIMS AND BACKGROUND

To evaluate the adverse events (AEs) of bleeding caused by bevacizumab/5-fluorouracil/leucovorin (5-FU/LV) combination chemotherapy with addition of irinotecan or oxaliplatin in patients with metastatic colorectal cancer (mCRC).

METHODS

A retrospective study was conducted to evaluate the bleeding AEs associated with bevacizumab and to explore potential associations between bleeding and baseline patient characteristics. The National Cancer Institute Common Terminology Criteria for Adverse Events v4.0 were used to classify the severity of AEs. AEs were divided into five grades: grade 1, mild: intervention not indicated; grade 2, moderate: medical intervention or minor cauterization indicated; grade 3, severe: transfusion, radiological, endoscopic or elective surgical intervention indicated; grade 4, life threatening: urgent intervention indicated; and grade 5, death.

RESULTS

Sixty-two patients were evaluated. Bleeding occurred in 26 (41%) patients; the incidence of grade 3 bleeding was 1.6% while no grade 4-5 bleeding occurred. Grade 1 epistaxis and grade 2 hemoptysis events were observed in 25.8% and 3.2% of patients, respectively. Hematochezia events occurred in 12 (19.4%) patients, one (1.6%) of whom required bevacizumab discontinuation. The incidence of hematochezia was higher in patients with unresected primary tumors, prior intestinal bleeding, and tumor response (p&lt;0.05).

CONCLUSIONS

These data provide important information about the incidence of clinically significant bleeding AEs, including minor mucocutaneous hemorrhage and major tumor-related bleeding such as hemoptysis and hematochezia in bevacizumab-treated mCRC patients. In addition, unresected primary tumor, prior bleeding, and tumor response were significant risk factors for hematochezia.

Bevacizumab: A dose review

Angiogenesis is a key process in cancer development and has been described has a hallmark of cancer. Two dose-intensities were approved for cancer treatment by the Food and Drug Administration and European Medicines Agency: 2.5mg/kg/week dose equivalent and 5mg/kg/week dose equivalent. While bevacizumab has shown its effectiveness in clinical trials, pharmacodynamics is not fully understood and a dose-effect relationship has not been proven in vivo. Direct trials comparing high or low doses are rare with potential dose-effect toxicity. Discordant data have been reported on the efficacy of doses. This review discusses the dose of bevacizumab via the analysis of studies that led to the approval of bevacizumab in clinical practice. Optimization of doses schemes could reduce potential dose-effect toxicities, potentiate synergetic effects with chemotherapy and permit the prescription to a larger population with a better cost-effectiveness ratio.

Inhibition of angiogenesis in human endothelial cell using VEGF specific nanobody

Angiogenesis is an important step in tumor development and metastasis. Vascular endothelial growth factor (VEGF) plays an important role in progression of angiogenesis. VEGF121 and VEGF165 are the most relative forms of VEGF family which contain the full biological activity. Nanobodies derived from camelidae are the smallest biding site of antigen. Unique characteristic of nanobodies make them as a useful candidate for research. In this report, we describe the isolation of VEGF specific nanobodies from dromedaries immunized with purified VEGF antigen using phage display. Four clones that showed the highest signal value in ELISA experiment were selected and expressed as a His-tagged fusion protein. Four selected nanobodies were reacted strongly to VEGF in cross-reactivity assay. The binding affinity of selected nanobodies named Nb22, Nb23, Nb35 and Nb42 were differed from 0.1 to 60nM. The nanobodies inhibited endothelial cell proliferation or tube formation in response of VEGF in a dose-dependent manner. These results indicate the potential of nanobodies in inhibition of VEGF and represent a promising candidate for cancer research and therapeutics.