A decade of clinical development of PARP inhibitors in perspective.

Genomic instability is a hallmark of cancer, and often is the result of altered DNA repair capacities in tumour cells. DNA damage repair defects are common in different cancer types; these alterations can also induce tumour-specific vulnerabilities that can be exploited therapeutically. In 2009, a first-in-man clinical trial of the poly(ADP-ribose) polymerase (PARP) inhibitor olaparib clinically validated the synthetic lethal interaction between inhibition of PARP1, a key sensor of DNA damage, and BRCA1/BRCA2 deficiency. In this review, we summarize a decade of PARP inhibitor clinical development, a work that has resulted in the registration of several PARP inhibitors in breast (olaparib and talazoparib) and ovarian cancer (olaparib, niraparib and rucaparib, either alone or following platinum chemotherapy as maintenance therapy). Over the past 10 years, our knowledge on the mechanism of action of PARP inhibitor as well as how tumours become resistant has been extended, and we summarise this work here. We also discuss opportunities for expanding the precision medicine approach with PARP inhibitors, identifying a wider population who could benefit from this drug class. This includes developing and validating better predictive biomarkers for patient stratification, mainly based on homologous recombination defects beyond BRCA1/BRCA2 mutations, identifying DNA repair deficient tumours in other cancer types such as prostate or pancreatic cancer, or by designing combination therapies with PARP inhibitors.

The Influence of Donor and Recipient Gender Incompatibility on Corneal Transplant Rejection and Failure.

In vascularized organ transplants, gender mismatches have higher rates of immunological rejection. We investigated the influence of gender incompatibility, including H-Y incompatibility, on corneal transplant graft rejection and failure. Patients were included who had undergone a first corneal transplant for keratoconus (KC), Fuchs endothelial dystrophy (FED), pseudophakic bullous keratopathy (PBK), infection and other indications. A Cox regression model was fitted for each indication to determine factors affecting graft failure and rejection at 5 years. The impact of gender, including H-Y, matching was analyzed after accounting for other factors, including known risk factors. Of 18 171 patients, 4314 had undergone a transplant for FED, 4783 for KC, 3669 for PBK, 1903 for infection and 3502 for other disorders. H-Y mismatched (male [M]→female [F]) corneas were at greater risk of graft failure or rejection. For FED, F→F were 40% less likely to fail (p < 0.0001) and 30% less likely to reject (p = 0.01); M→M were 20% less likely to fail (p = 0.04) and 30% less likely to reject (p = 0.01). For KC, M→M matched corneas were 30% less likely to fail (p = 0.05) and 20% less likely to reject (p = 0.01) compared with H-Y mismatches. H-Y antigen mismatched (M→F) patients were at greater risk of rejection or graft failure.

Phase I trial outcomes in older patients with advanced solid tumours.

BACKGROUND: This study had two aims: (a) to test the hypothesis that advanced age is associated with lower levels of tolerability and clinical benefit to experimental Phase I trial agents; (b) to assess the validity of the Royal Marsden Hospital (RMH) prognostic score as a patient selection tool in older patients. METHODS: Clinico-pathological characteristics and treatment outcomes of all patients treated consecutively from 2005 to 2009 in phase I trials at the RMH were recorded. All toxicity and clinical outcome data were compared between patients aged below and above 65 years of age. RESULTS: One thousand and four patients were treated in 30 Phase I trials, with 315 (31%) patients aged 65 years and older. Grade 3-5 toxicities (22.8% vs 24.8% (P=0.52)), trial discontinuation (6% vs 4%; P=0.33), and dose interruptions (8.0% vs 8.0% (P=0.96)) were observed at similar rates in patients below and above 65 years of age, respectively. The overall response rate 5.2% vs 4.1%, progression-free survival (PFS) 1.9 vs 3.5 months and clinical benefit rate (CBR) at 6 months 15.2% vs 14.3% were comparable in both groups. To avoid bias due to the potential therapeutic benefit of abiraterone, comparisons were repeated excluding prostate cancer patients with similar results (ORR 4.6% vs 4%, PFS 1.8 vs 3.0 months, CBR at 6 months 13.5% vs 9.5%). Multivariate analysis indicated that the previously identified RMH score (including albumin and lactate dehydrogenase levels) was an accurate predictor of outcome. CONCLUSIONS: Phase I clinical trials should be considered in patients with advanced cancers regardless of age, as older patients who enter these have similar safety and efficacy outcomes as their younger counterparts. The RMH prognostic score can assist in the selection of suitable older patients.

Progress in the treatment of ovarian cancer-lessons from homologous recombination deficiency-the first 10 years.

For several years, a major obstacle in the systemic treatment of ovarian cancer has been the lack of a therapeutic strategy tailored to specific biomarkers present in the individual patient's tumour. However, considerable progress has been made recently through the development of drugs targeting cells deficient in the key mechanism of double-strand DNA repair, known as homologous recombination (HRD). These drugs, inhibitors of the enzyme poly (ADP) ribose polymerase (PARP), selectively kill HRD cells through a process known as tumour-selective synthetic lethality. Olaparib is the first such agent, now approved for the treatment of ovarian cancer associated with mutations in the BRCA 1/2 genes, since these are characterised by cells with HRD. Importantly, another group of patients with tumours bearing a similar repair deficiency but without BRCA mutations may also be susceptible to PARP inhibition and efforts to develop an HRD assay are therefore a priority so that these patients can be identified as PARPi candidates. In addition, combination strategies are an area of intense research; these include combinations with antiangiogenic agents and with inhibitors of the P13K/AKT pathway and others are likely to merit assessment since resistance to PARP inhibitors will certainly emerge as the next challenge. While olaparib is the first PARP inhibitor to receive approval for ovarian cancer treatment, others including rucaparib and niraparib are clearly effective in this disease and, within the next year or two, the results of ongoing randomised trials will clarify their respective roles. PARP inhibitors are generally well tolerated; regulatory approval at present supports their use as a maintenance therapy (in Europe) and as treatment for advanced recurrent disease (in the United States), but it is likely that these indications will extend as the results of ongoing trials become available. Ten years have elapsed between the first pre-clinical publications and the regulatory approval of PARP inhibitors and the next 10 years promise to be even more productive.

BRCA somatic mutations and epigenetic BRCA modifications in serous ovarian cancer.

The significant activity of poly(ADP-ribose)polymerase (PARP) inhibitors in the treatment of germline BRCA mutation-associated ovarian cancer, which represents ∼15% of HGS cases, has recently led to European Medicines Agency and food and drug administration approval of olaparib. Accumulating evidence suggests that PARP inhibitors may have a wider application in the treatment of sporadic ovarian cancers. Up to 50% of HGS ovarian cancer patients may exhibit homologous recombination deficiency (HRD) through mechanisms including germline BRCA mutations, somatic BRCA mutations, and BRCA promoter methylation. In this review, we discuss the role of somatic BRCA mutations and BRCA methylation in ovarian cancer. There is accumulating evidence for routine somatic BRCA mutation testing, but the relevance of BRCA epigenetic modifications is less clear. We explore the challenges that need to be addressed if the full potential of these markers of HRD is to be utilised in clinical practice.

The neutrophil-lymphocyte ratio and its utilisation for the management of cancer patients in early clinical trials.

BACKGROUND: Inflammation is critical to the pathogenesis and progression of cancer, with a high neutrophil-lymphocyte ratio (NLR) associated with poor prognosis. The utility of studying NLR in early clinical trials is unknown. METHODS: This retrospective study evaluated 1300 patients treated in phase 1 clinical trials between July 2004 and February 2014 at the Royal Marsden Hospital (RMH), UK. Data were collected on patient characteristics and baseline laboratory parameters. RESULTS: The test cohort recruited 300 patients; 53% were female, 35% ECOG 0 and 64% ECOG 1. RMH score was 0-1 in 66% and 2-3 in 34%. The median NLR was 3.08 (IQR 2.06-4.49). Median OS for the NLR quartiles was 10.5 months for quartile-1, 10.3 months for quartile-2, 7.9 months for quartile-3 and 6.5 months for quartile-4 (P<0.0001). Univariate analysis identified RMH score (HR=0.55, P<0.0001), ECOG (HR=0.62, P=0.002) and neutrophils (HR=0.65, P=0.003) to be associated with OS. In multivariate analysis, adjusting for RMH score, ECOG, neutrophils and tumour type, NLR remained significantly associated with OS (P=0.002), with no association with therapeutic steroid use. These results were validated in a further 1000 cancer patients. In the validation cohort, NLR was able to discriminate for OS (P=0.004), as was the RMH score. This was further improved on in the RMH score+NLR50 and RMH score+Log10NLR models, with an optimal NLR cutoff of 3.0. CONCLUSIONS: NLR is a validated independent prognostic factor for OS in patients treated in phase 1 trials. Combining the NLR with the RMH score improves the discriminating ability for OS.

Complications of hyperglycaemia with PI3K-AKT-mTOR inhibitors in patients with advanced solid tumours on Phase I clinical trials.

BACKGROUND: PI3K-AKT-mTOR inhibitors (PAMi) are promising anticancer treatments. Hyperglycaemia is a mechanism-based toxicity of these agents and is becoming increasingly important with their use in larger numbers of patients. METHODS: Retrospective case-control study comparing incidence and severity of hyperglycaemia (all grades) between a case group of 387 patients treated on 18 phase I clinical trials with PAMi (78 patients with PI3Ki, 138 with mTORi, 144 with AKTi and 27 with PI3K/mTORi) and a control group of 109 patients treated on 10 phase I clinical trials with agents not directly targeting the PAM pathway. Diabetic patients were excluded in both groups. RESULTS: The incidence of hyperglycaemia was not significantly different between cases and controls (86.6% vs 80.7%, respectively, P=0.129). However, high grade (grade 3-4) hyperglycaemia was more frequent in the PAMi group than in controls (6.7% vs 0%, respectively, P=0.005). The incidence of grade 3-4 hyperglycaemia was greater with AKT and multikinase inhibitors compared with other PAMi (P<0.001). All patients with high-grade hyperglycaemia received antihyperglycemic treatment and none developed severe metabolic complications (diabetic ketoacidosis or hyperosmolar hyperglycemic nonketotic state). High-grade hyperglycaemia was the cause of permanent PAMi discontinuation in nine patients. CONCLUSIONS: PI3K-AKT-mTOR inhibitors are associated with small (6.7%) but statistically significant increased risk of high-grade hyperglycaemia compared with non-PAM targeting agents. However, PAMi-induced hyperglycaemia was not found to be associated with severe metabolic complications in this non-diabetic population of patients with advanced cancers.

A randomised, placebo-controlled trial of weekly paclitaxel and saracatinib (AZD0530) in platinum-resistant ovarian, fallopian tube or primary peritoneal cancer†.

BACKGROUND: We investigated whether the Src inhibitor saracatinib (AZD0530) improved efficacy of weekly paclitaxel in platinum-resistant ovarian cancer. PATIENTS AND METHODS: Patients with platinum-resistant ovarian, fallopian tube or primary peritoneal cancer were randomised 2 : 1 to receive 8-week cycles of weekly paclitaxel (wPxl; 80 mg/m(2)/week ×6 with 2-week break) plus saracatinib (S; 175 mg o.d.) or placebo (P) continuously, starting 1 week before wPxl, until disease progression. Patients were stratified by taxane-free interval (<6 versus ≥6 months/no prior taxane). The primary end point was progression-free survival (PFS) rate at 6 months. Secondary end points included overall survival (OS) and response rate (RR). RESULTS: A total of 107 patients, median age 63 years, were randomised. Forty-three (40%) had received >2 lines of prior chemotherapy. The 6-month PFS rate was 29% (wPxl + S) versus 34% (wPxl + P) (P = 0.582). Median PFS was 4.7 versus 5.3 months (hazard ratio 1.00, 95% confidence interval 0.65-1.54; P = 0.99). RR (complete + partial) was 29% (wPxl + S) versus 43% (wPxl + P), P value = 0.158. Grade 3/4 adverse events were 36% versus 31% (P = 0.624); the most frequent G3/4 toxicities were vomiting (5.8% saracatinib versus 8.6% placebo), abdominal pain (5.8% versus 0%) and diarrhoea (4.3% versus 5.7%). Febrile neutropenia was more common in the saracatinib arm (4.3%) than placebo (0%). Response, PFS and OS were all significantly (P < 0.05) better in patients with taxane interval ≥6 months/no prior taxane (n = 85) than those <6 months (n = 22), regardless of randomisation. CONCLUSIONS: Saracatinib does not improve activity of weekly paclitaxel in platinum-resistant ovarian cancer. Taxane-free interval of ≥6 months/no prior taxane was associated with better outcome in both groups. TRIALS REGISTRATION: Clinicaltrials.gov NCT01196741; ISRCTN 32163062.

Outcome of patients with sarcoma and other mesenchymal tumours participating in phase I trials: a subset analysis of a European Phase I database.

BACKGROUND: Although sarcomas account for only 1% of all solid tumours, patients with sarcomas comprise a larger proportion of patients entering phase I trials, due to the limited number of registered or active drugs for these diseases. To help in patient selection, we evaluated the utility of the predictive Royal Marsden Score which had been derived in carcinoma patients. In addition, we analysed efficacy and toxicity regarding the sarcoma population enrolled in phase I trials. PATIENTS AND METHODS: We used data from a European Database comprising 2182 patients treated in phase I trials in 14 European institutions between 2005 and 2007. RESULTS: One hundred and seventy-eight patients diagnosed with advanced sarcoma or other mesenchymal tumours were identified and accounted for 217 phase I trial participations during the study period. Histological type, class of drug, number of metastatic sites, high serum lactate dehydrogenase activity (LDH), low albumin and high white blood cell count were independent prognostic factors. Poor performance status (PS), liver metastases and high leucocyte count were associated with increased risk of early death. The class of drug used was the strongest predictor of progression-free survival (PFS) duration, inhibitors of angiogenesis and histone deacetylase giving the best results. Poor PS, high serum LDH and low lymphocyte count correlated with shorter PFS. In this heterogeneous population, PFS with investigational agents appeared comparable with that previously published for patients receiving standard treatments beyond first line. CONCLUSION: Prognostic factors in sarcoma patients do not differ from a broader phase I population. Efficacy measures suggest that some patients with sarcoma derive benefit from therapy in this setting which could therefore be considered for patients with no remaining standard therapeutic option.

New perspectives on molecular targeted therapy in ovarian clear cell carcinoma.

Ovarian clear cell carcinomas (OCCCs) account for about 5-13% of all epithelial ovarian carcinomas in Western populations. It is characterised by resistance to conventional platinum-based chemotherapy, and new therapeutic strategies are urgently required. This article will focus on how recent discoveries have enhanced our understanding of the molecular pathogenesis of OCCCs, leading to new therapeutic opportunities. These include mutations in ARID1A, which provides a link to endometriosis, upregulation of the phosphatidylinositol 3-kinase/AKT pathway, particularly through mutations of PIK3CA and inactivation of PTEN, and increased activity of pathways involved in angiogenesis. Targeting HER2, apoptotic escape mechanisms and mismatch repair defects offer additional opportunities for treating this enigmatic tumour subtype.

New developments in the treatment of ovarian cancer--future perspectives.

Over the past 40 years, the treatment of ovarian cancer has undoubtedly improved as a result of better multi-modality care and platinum-based chemotherapy. More recently, the introduction of anti-angiogenic therapy, PARP inhibitors and a weekly regimen for paclitaxel indicate that results are likely to improve further. However, major challenges remain and these will be reviewed in this article. We assess key issues in anti-angiogenic treatment including potential ways for addressing resistance; we review the current studies of PARP inhibitor treatment, which shows most promise in patients with germline BRCA mutations; we describe the potential for folate-receptor-directed therapy, given the high level of FR expression in ovarian cancer and we highlight the potential for molecular targeted therapy, focusing on specific subgroups of the disease with targets such as the PI3 K/AKT and RAS/RAF/MEK pathways and the ErbB family of oncogenes. We anticipate that progress will accelerate with a better understanding of the molecular pathogenesis of the various subtypes of ovarian cancer, leading to an increasingly personalized approach to treating women with this disease.

Association of somatic DNA methylation variability with progression-free survival and toxicity in ovarian cancer patients.

BACKGROUND: We have addressed whether inter-individual methylation variation in somatic (white blood cells, WBCs) DNA of ovarian cancer patients provides potential for prognostic and/or pharmacoepigenetic stratification. PATIENTS AND METHODS: WBC DNA methylation was analysed by bisulphite pyrosequencing at ataxia telangiectasia mutated (ATM), estrogen receptor 1 (ESR1), progesterone receptor (PGR), mutL homologue 1 (MLH1), breast cancer susceptibility gene (BRCA1), secreted frizzled-related protein 1 (SFRP1), stratifin (SFN), retinoic acid receptor beta (RARB) loci and the repetitive element LINE1 in 880 SCOTROC1 trial patients [paclitaxel (Taxol)-carboplatin versus docetaxel (Taxotere)-carboplatin as primary chemotherapy for stage Ic-IV epithelial ovarian cancer]. RESULTS: We observed no significant associations (P < 0.005, after correction for multiple testing) for progression-free survival (PFS) using test and validation sets. However, we did identify mean SFN methylation associated with PFS (hazard ratio, HR = 1.01 per 1% increase in methylation, q = 0.028); particularly in the paclitaxel (HR = 1.01, q = 0.006), but not in the docetaxel arm in stratified analyses. Furthermore, higher methylation within the ESR1 gene was associated with CA125 response (odds ratio, OR = 1.06, q = 0.04) and with neuropathy (HR = 0.95, q = 0.002), but only in the paclitaxel arm of the trial. CONCLUSIONS: This is the first study linking DNA methylation variability in WBC to clinical outcomes for any tumour type; the data generated on novel prognostic and pharmacoepigenetic DNA methylation biomarkers in the circulation now need independent further evaluation.

A randomized phase II study evaluating the combination of carboplatin-based chemotherapy with pertuzumab versus carboplatin-based therapy alone in patients with relapsed, platinum-sensitive ovarian cancer.

BACKGROUND: Pertuzumab, a humanized monoclonal antibody targeting human epidermal growth factor receptor (HER)-mediated signalling, has shown activity in ovarian cancer in preclinical models and in the clinic. This randomized phase II study evaluated efficacy and safety of pertuzumab in combination with carboplatin-based chemotherapy in patients with platinum-sensitive, recurrent advanced ovarian cancer. PATIENTS AND METHODS: Patients were randomized to receive six cycles of chemotherapy (carboplatin and either paclitaxel (Taxol) or gemcitabine) with or without pertuzumab. The primary end point was progression-free survival (PFS) as determined by Response Evaluation Criteria in Solid Tumors and/or by CA 125 measurements. Secondary end points evaluated the response rate, safety profile, duration of response, time to progression and overall survival for both treatment arms. RESULTS: A total of 149 patients received either chemotherapy with pertuzumab (arm A, n=74) or chemotherapy alone (arm B, n=75). There was no significant difference either in median PFS or in the secondary end points between the two arms. No differences were seen in an exploratory biomarker analysis of HER3 mRNA expression between the two arms. Pertuzumab was well tolerated, with no increase in cardiac adverse events compared with chemotherapy alone. CONCLUSIONS: The addition of pertuzumab to carboplatin-based chemotherapy did not substantially prolong PFS in unselected patients with platinum-sensitive ovarian cancer.

A multicenter, randomized trial of flat dosing versus intrapatient dose escalation of single-agent carboplatin as first-line chemotherapy for advanced ovarian cancer: an SGCTG (SCOTROC 4) and ANZGOG study on behalf of GCIG.

BACKGROUND: The aim of the study is to demonstrate that intrapatient dose escalation of carboplatin would improve the outcome in ovarian cancer compared with flat dosing. PATIENTS AND METHODS: Patients with untreated stage IC-IV ovarian cancer received six cycles of carboplatin area under the curve 6 (AUC 6) 3 weekly either with no dose modification except for toxicity (Arm A) or with dose escalations in cycles 2-6 based on nadir neutrophil and platelet counts (Arm B). The primary end-point was progression-free survival (PFS). RESULTS: Nine hundred and sixty-four patients were recruited from 71 centers. Dose escalation was achieved in 77% of patients who had ≥1 cycle. The median AUCs (cycle 2-6) received were 6.0 (Arm A) and 7.2 (Arm B) (P < 0.001). Grade 3/4 non-hematological toxicity was higher in Arm B (31% versus 22% P = 0.001). The median PFS was 12.1 months in Arm A and B [hazard ratio (HR) 0.99; 95% confidence interval (CI) 0.85-1.15; P = 0.93]. The median overall survival (OS) was 34.1 and 30.7 months in Arms A and B, respectively (HR 0.98; 95% CI 0.81-1.18, P = 0.82). In multivariate analysis, baseline neutrophil (P < 0.001), baseline platelet counts (P < 0.001) and the difference between white blood cell (WBC) and neutrophil count (P = 0.009) had a significant adverse prognostic value. CONCLUSIONS: Intrapatient dose escalation of carboplatin based on nadir blood counts is feasible and safe. However, it provided no improvement in PFS or OS compared with flat dosing. Baseline neutrophils over-ride nadir counts in prognostic significance. These data may have wider implications particularly in respect of the management of chemotherapy-induced neutropenia.

Functional imaging: what evidence is there for its utility in clinical trials of targeted therapies?

Key issues in early clinical trials of targeted agents include the determination of target inhibition, rational patient selection based on pre-treatment tumour characteristics, and assessment of tumour response in the absence of actual shrinkage. There is accumulating evidence that functional imaging using advanced techniques such as dynamic contrast enhanced (DCE)-magnetic resonance imaging (MRI), DCE-computerised tomography (CT) and DCE-ultrasound, diffusion weighted-MRI, magnetic resonance spectroscopy and positron emission tomography-CT using various labelled radioactive tracers has the potential to address all three. This article reviews this evidence with examples from trials using targeted agents with established clinical efficacy and summarises the clinical utility of the various techniques. We therefore recommend that input from specialist radiologists is sought at the early stages of trial design, in order to ensure that functional imaging is incorporated appropriately for the agent under study. There is an urgent need to strengthen the evidence base for these techniques as they evolve, and to ensure standardisation of the methodology.

Association of creatine kinase and skin toxicity in phase I trials of anticancer agents.

BACKGROUND: We investigated the association between skin rash and plasma creatine kinase (CK) levels in oncology phase I trials. METHODS: We analysed data from 295 patients treated at our institution within 25 phase I trials which included CK measurements in the protocol. Trials involved drugs targeting EGFR/HER2, m-TOR, VEGFR, SRC/ABL, aurora kinase, BRAF/MEK, PARP, CDK, A5B1 integrin, as well as oncolytic viruses and vascular disrupting agents. RESULTS: Creatine kinase measurements were available for 278 patients. The highest levels of plasma CK during the trial were seen among patients with Grade (G) 2/3 rash (median 249 U l(-1)) compared with G1 (median 81 U l(-1)) and no rash (median 55 U l(-1)) (P<0.001). There was a significant reduction in CK after the rash resolved (mean 264.2 vs 100.1; P=0.012) in 25 patients, where serial CK values were available. In vitro exposure of human keratinocytes to EGFR, MEK and a PI3Kinase/m-TOR inhibitor led to the increased expression of CK-brain and not CK-muscle or mitochondrial-CK. CONCLUSION: Plasma CK elevation is associated with development of skin rash caused by novel anticancer agents. This should be studied further to characterise different isoforms as this will change the way we report adverse events in oncology phase I clinical trials.

Prediction of early death among patients enrolled in phase I trials: development and validation of a new model based on platelet count and albumin.

BACKGROUND: Selecting patients with 'sufficient life expectancy' for Phase I oncology trials remains challenging. The Royal Marsden Hospital Score (RMS) previously identified high-risk patients as those with ≥ 2 of the following: albumin <35 g l(-1); LDH > upper limit of normal; >2 metastatic sites. This study developed an alternative prognostic model, and compared its performance with that of the RMS. METHODS: The primary end point was the 90-day mortality rate. The new model was developed from the same database as RMS, but it used Chi-squared Automatic Interaction Detection (CHAID). The ROC characteristics of both methods were then validated in an independent database of 324 patients enrolled in European Organization on Research and Treatment of Cancer Phase I trials of cytotoxic agents between 2000 and 2009. RESULTS: The CHAID method identified high-risk patients as those with albumin <33 g l(-1) or ≥ 33 g l(-1), but platelet counts ≥ 400.000 mm(-3). In the validation data set, the rates of correctly classified patients were 0.79 vs 0.67 for the CHAID model and RMS, respectively. The negative predictive values (NPV) were similar for the CHAID model and RMS. CONCLUSION: The CHAID model and RMS provided a similarly high level of NPV, but the CHAID model gave a better accuracy in the validation set. Both CHAID model and RMS may improve the screening process in phase I trials.

Defining the risk of toxicity in phase I oncology trials of novel molecularly targeted agents: a single centre experience.

BACKGROUND: This study defined the risk of serious toxicity in phase I trials of molecularly targeted agents (MTA). PATIENTS AND METHODS: A retrospective analysis of toxicity data from patients treated in phase I trials of MTAs was carried out to define the rate of treatment-related grade 3/4 toxic effects, deaths and risk factors associated with grade 3 or more toxicity. RESULTS: Data from 687 patients [median age, 59.1 years (range 12.5-85.5)] treated in 36 trials were analysed. Two hundred and eleven patients were of Eastern Cooperative Oncology Group performance status (PS) zero, 432 of PS one, 38 of PS two and 6 unknown. The rate of grade 3 and 4 events was 14.1% (n=97) and 1.9% (n=13), respectively. Twenty-four percent of events were gastrointestinal, 22% constitutional and 20% metabolic. PS two was associated with a higher risk of toxicity [odds ratio (OR), 2.6; 95% confidence interval (CI) 1.1-6.1; P=0.032] as was receiving >100% of maximum tolerated dose or maximum administered dose (OR 2.5; CI 1.6-3.9; P<0.001). Mortality rate was 0.43% (n=3). CONCLUSIONS: Therapy with novel MTAs in phase I trials is associated with a moderate risk of significant toxicity. This appears less than in phase I studies involving cytotoxic agents, particularly in relation to grade 4 toxicity. The risk of death is low.

Creatinine clearance is associated with toxicity from molecularly targeted agents in phase I trials.

OBJECTIVES: This study aimed to evaluate any correlations between baseline creatinine clearance and the development of grade 3/4 toxicities during treatment within oncology phase I trials of molecularly targeted agents where entry criteria mandate a serum creatinine of ≤ 1.5 × the upper limit of normal. METHODS: Documented toxicity and creatinine clearance (calculated by the Cockcroft-Gault formula) from all patients treated with molecularly targeted agents in the context of phase I trials within our centre over a 5-year period were analyzed. RESULTS: Data from 722 patients were analyzed; 116 (16%) developed at least one episode of grade 3/4 toxicity. Patients who developed a late-onset (>1 cycle) grade 3/4 toxicity had a lower creatinine clearance than those who did not (82.69 ml/min vs. 98.97 ml/min; p = < 0.001). CONCLUSION: Creatinine clearance (even when within normal limits) should be studied as a potential factor influencing late toxicities in the clinical trials of molecularly targeted anti-cancer drugs.

Outcomes of surgical management of bowel obstruction in relapsed epithelial ovarian cancer (EOC).

OBJECTIVE: To describe the outcomes of surgical management of bowel obstruction in relapsed epithelial ovarian cancer (EOC) so as to define the criteria for patient selection for palliative surgery. METHODS: 90 women with relapsed EOC underwent palliative surgery for bowel obstruction between 1992 and 2008. RESULTS: Median age at time of surgery for bowel obstruction was 57 years (range, 26 to 85 years). All patients had received at least one line of platinum-based chemotherapy. Median time from diagnosis of primary disease to documented bowel obstruction requiring surgery was 19.5 months (range, 29 days-14 years). Median interval from date of completed course of chemotherapy preceding surgery for bowel obstruction was 3.8 months (range, 5 days-14 years). Ascites was present in 38/90(42%). 49/90(54%) underwent emergency surgery for bowel obstruction. The operative mortality and morbidity rates were 18% and 27%, respectively. Successful palliation, defined as adequate oral intake at least 60 days postoperative, was achieved in 59/90(66%). Only the absence of ascites was identified as a predictor for successful palliation (p=0.049). The median overall survival (OS) was 90.5 days (range, <1 day-6 years). Optimal debulking, treatment-free interval (TFI) and elective versus emergency surgery did not predict survival or successful palliation from surgery for bowel obstruction (p>0.05). CONCLUSION: Surgery for bowel obstruction in relapsed EOC is associated with a high morbidity and mortality rate especially in emergency cases when compared to other gynaecological oncological procedures. Palliation can be achieved in almost two thirds of cases, is equally likely in elective and emergency cases but is less likely in those with ascites.