OVARIAN CANCER and US: progression free survival

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Showing posts with label progression free survival. Show all posts
Showing posts with label progression free survival. Show all posts

Sunday, May 27, 2012

Time to Ovarian Cancer Return Not Tied to BMI - in Meeting Coverage, ASCO from MedPage Today



Medical News: Time to Ovarian Cancer Return Not Tied to BMI - in Meeting Coverage, ASCO from MedPage Today


Action Points


  • Note that this study was published as an abstract and will be presented at a conference. These data and conclusions should be considered to be preliminary until published in a peer-reviewed journal.
  • A study found that obesity did not affect recurrence, time to recurrence, or progression-free survival in women with epithelial ovarian cancer following surgery and adjuvant chemotherapy without evidence of disease during treatment.
  • Note that the approximately one-third of patients who had BMI >30 kg/m2 had similar recurrence rates and time to recurrence as the two-thirds of non-obese patients.

Tuesday, April 10, 2012

abstract: A systematic review evaluating the relationship between progression free survival and post progression survival in advanced ovarian cancer



 Blogger's Note:
this is and has been an ongoing issue in clinical trials as most use still use overall survival (OS) (as per this paper and others)  as the endpoint as opposed to progression free survival; it is a technical debate having wide implications for ovarian cancer treatments/patients, without access to the full text paper and based on the abstract alone,  one outstanding issue would be the impact of QOL/side effects/number of prior treatments, so in plain english as an example - clinical trial x includes standard treatment vs other, no more than eg. 3 prior chemos would be a component of the clinical trial - therefore - what was/is the mix of patients in the trial - all of which impact survival ratios irrespective of PFS/OS; opinions as usual are welcome
                                      ~~~~~~~~~~~~~~~~~

A systematic review evaluating the relationship between progression free survival and post progression survival in advanced ovarian cancer:




Objective 
Although overall survival is the ultimate goal of cancer therapy, many clinical and health economic decisions are taken when only progression free survival (PFS) data are available. This study evaluates the relationship between PFS and post progression survival (i.e. the time between disease progression and death) to estimate how many months a new drug for ovarian cancer might add to overall survival if the number of months the drug added to PFS (relative to a standard drug) was already known.

Methods 
A literature search was conducted over Medline for randomised controlled trials published between January 1990 and July 2010 that evaluated the effect of a drug treatment in comparison to alternative drug treatment in patients with either advanced stage primary or recurrent ovarian cancer.
A systematic review of progression free and post progression survival (PPS) was performed. The relationship between PFS and PPS was evaluated by a graphical method and standard statistical tests.

Results
Thirty-seven trials involving 15,850 patients met the inclusion criteria. The review found that increases in median PFS generally lead to little change in post-progression survival. Percentage gains in PFS are generally associated with no percentage gains or with very slight percentage gains or losses in post-progression survival

Conclusion
If the effect of a new drug treatment for ovarian cancer is to extend median PFS by x months, then it is reasonable to estimate that the treatment will also extend median overall survival by x months. This information will be useful for individual and collective decision making.

Thursday, March 08, 2012

open access: Progression-free Survival Decreases with Each Subsequent Therapy in Patients Presenting for Phase I Clinical Trials (study included various cancers including ovarian cancer) note: patient warning before reading



Blogger's Note: patient warning - this is not a 'good news' paper so caution advised

Table I 
Patient Diagnoses, Gender, Median Age at Diagnosis and Median Number of Therapies  (Blogger's Note: total patients = 142; ovarian cancer patients = 11)

Patient Characteristics

"We reviewed the patient records of 165 unique patients that were evaluated for participation in six phase I trials. Due to a lack of specific start/stop dates, 25 patients had at least one treatment censored for analysis; with one of these patients not having PFS that could be calculated for this study. Seventeen of these twenty-five patients were diagnosed as having less than stage IV disease, with the majority of censored treatments (radiation, surgery, or neoadjuvant or adjuvant chemotherapy) occurring in the non-advanced/metastatic setting. One hundred forty-four patients met criteria for receiving at least one prior non-investigational systemic therapy for advanced/metastatic cancer prior to coming for a phase I treatment evaluation. There were 77 men and 65 women; median age at cancer diagnosis was 55.3 years (range, 9.4 - 81.6 years). The most common types were: colorectal cancer (n=20 (13.9%)), other gastrointestinal cancer (n=17 (11.8%)), adenocarcinoma of the prostate (n=17 (11.8%)), non-small cell lung cancer (NSCLC) (n=13 (9.0%)), breast cancer (n=12 (8.3%)), ovarian cancer (n=11 (7.6%)), and adenocarcinoma of the pancreas (n=9 (6.3%)) (Table I). Patients had a median of three chemotherapy or hormonal treatments (mean, 3.32 treatments; range, 1 - 11 treatments).
Two of the 144 patients did not receive a second systemic therapy prior to evaluation at our center, so PFS could be calculated for the remaining 142 patients. The PFS from txn to txn+3 was significantly decreased (p = 0.001850) (Figure 1). Few advanced cancers have more than four lines of FDA-approved or consensus guidelines recommendations for systemic therapy, thus we examined the time to progression of the first five treatments (p = 2.938e-07) (Figure 2)."



Saturday, February 18, 2012

updated - link to full free paper: Review: Therapeutic strategies in epithelial ovarian cancer (references clear cell ovarian)



 Blogger's Note: numerous references to clear cell ovarian cancer as per Japanese historical ovarian cancer research



direct link to pdf file 

 "In summary, it appears that the vast majority of what seem to be primary epithelial ovarian and primary peritoneal carcinomas are, in fact, secondary.

Previous data support the view that serous tumors develop from the fimbria, the most distal part of the fallopian tube, endometrioid and clear cell tumors from endometrial tissue passing through the fallopian tube resulting in endometriosis and mucinous and Brenner tumors from transitional-type epithelium located at the tubal-mesothelial junction where the fimbria makes contact to the peritoneum.

Although the data suggesting that epithelial ovarian carcinoma arises in extra-ovarian sites and involves the ovaries secondarily are compelling, low- and high-grade serous carcinomas involve the ovaries and other pelvic and abdominal organs, such as the omentum and mesentery, much more extensively than the fallopian tubes. Similarly, although endometrioid carcinomas develop from endometriosis, which frequently involves multiple sites in the pelvis, these tumors are usually confined to the ovaries.

It is likely that the predisposition for
growth in the ovary is multifactorial but the precise reasons for this are unknown."




Wednesday, February 01, 2012

open access: 2011 Progression-free survival in advanced ovarian cancer: a Canadian review and expert panel perspective | Dr A. Oza | Current Oncology (topics: eg chronic disease, 1st line therapy...)



Blogger's Note: may require registration (free); note also list of useful (international) reference papers

                                                                                        


Ovarian cancer is leading cause of gynecologic cancer mortality in Canada. To date, overall survival ( os ) has been the most-used endpoint in oncology trials because of its relevance and objectivity. However, as a result of various factors, including the pattern of sequential salvage (outdated term)  therapies, measurement of os and collection of os data are becoming particularly challenging. Phase ii and iii trials have therefore adopted progression-free survival ( pfs ) as a more convenient surrogate endpoint; however, the clinical significance of pfs remains unclear. This position paper presents discussion topics and findings from a pan-Canadian meeting of experts that set out to

  • evaluate the relevance of pfs as a valid endpoint in ovarian cancer;
  • reach a Canadian consensus on the relevance of pfs in ovarian cancer; and
  • try to address how pfs translates into clinical benefit in ovarian cancer.

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Recommendations for future investigations include these:


  • Ensure that trials are designed to evaluate pfs , os , and other clinically relevant endpoints such as disease-related symptoms or qol .
  • Incorporate interim futility analyses intended to stop accrual early when the experimental regimen is not active.
  • Stop trials early to declare superiority only when compelling evidence suggests that a new treatment provides benefit for a pre-specified clinically relevant endpoint such as os or symptom relief.
  • Importantly, discourage early release of secondary endpoint results when such a release might increase the frequency of crossover to the experimental intervention.


Tuesday, January 03, 2012

Identifying Clinical Improvement in Consolidation Single-Arm Phase 2 Trials in Patients With Ovarian Cancer in Second or Greater Clinical Remission



Abstract


Objective: Estimates of progression-free survival (PFS) from single-arm phase 2 consolidation/maintenance trials for recurrent ovarian cancer are usually interpreted in the context of historical controls. We illustrate how the duration of second-line therapy (SLT), the time on the investigational therapy (IT), and patient enrollment plan can affect efficacy measures from maintenance trials and might result in underpowered studies.
Conclusions:
Designs of nonrandomized consolidation trials that aim to prolong PFS must consider the effect of the duration of SLT on the end point definition and on required sample size. If IT is given concurrently with SLT, and after SLT, then SLT duration must be restricted per protocol eligibility, so that a comparison with historical data from other single-arm phase 2 studies is unbiased. If IT is given after SLT, the duration of SLT should be taken into account in the design stage because it will affect statistical power and sample size.

Correction: ABCB1 (MDR1) Polymorphisms and Progression-Free Survival among Women with Ovarian Cancer following Paclitaxel/Carboplatin Chemotherapy



link to original article:

The authors of this article (Clin Cancer Res 2008;14:5594-601), which was published in the September 1, 2008, issue of Clinical Cancer Research (1), wish to inform the scientific community that the results of the analysis of the ABCB1 3435C>T and 1236C>T SNPs presented were incorrectly reported due to a corrupted analysis file.

Friday, May 13, 2011

abstract: Correlation between CA-125 serum level and response by RECIST in a phase III recurrent ovarian cancer study.



OBJECTIVES:

To evaluate in a large phase III recurrent ovarian cancer trial (OVA-301): 1) the concordance between CA-125 level vs. best overall response (OR) and progression-free survival (PFS) determined by radiological assessment 2) the impact of early CA-125 changes over the subsequent radiological response, and 3) the prognostic value of CA-125 response and CA-125 PFS to predict radiological response and PFS.

Wednesday, April 06, 2011

Expression of DNA repair genes in ovarian cancer samples: Biological and clinical considerations




Abstract

The purpose of this study was to investigate retrospectively the mRNA expression of genes involved in different DNA repair pathways implicated in processing platinum-induced damage in 171 chemotherapy-naïve ovarian tumours and correlate the expression of the different genes with clinical parameters. The expression of genes involved in DNA repair pathways (PARP1, ERCC1, XPA, XPF, XPG, BRCA1, FANCA, FANCC, FANCD2, FANCF and PolEta), and in DNA damage transduction (Chk1 and Claspin) was measured by RT-PCR in 13 stage I borderline and 77 stage I and 88 III ovarian carcinomas.  


ERCC1, XPA, XPF and XPG genes were significantly less expressed in stage III than in stage I carcinoma; BRCA1, FANCA, FANCC, FANCD2 gene expressions were low in borderline tumours, higher in stage I carcinomas and lower in stage III samples. High levels of ERCC1, XPA, FANCC, XPG and PolEta correlated with an increase in Overall Survival (OS) and Progression Free Survival (PFS), whilst high BRCA1 levels were associated with PFS on univariate analysis.

With multivariate analyses no genes retained an association when adjusted by stage, grade and residual tumour. A tendency towards a better PFS was observed in patients with the highest level of ERCC1 and BRCA1 after platinum-based therapy than those given both platinum and taxol. The expression of DNA repair genes differed in borderline stage I, stage I and stage III ovarian carcinomas. The role of DNA repair genes in predicting the response in ovarian cancer patients seems far from being established.

Monday, June 07, 2010

ASCO: Debulking Predicts Survival in Recurrent Ovarian Cancer - in Meeting Coverage, ASCO



 "Our analysis represents the first study investigating the relevance of primary surgical outcome for survival after recurrence in ovarian cancer," Mahner and colleagues concluded in their poster presentation. "Our data show that the prognostic importance of initial surgery extends beyond initial treatment to recurrent disease, particularly for patients who have a platinum-free interval of more than 12 months."

 
Action Points

  • Explain to interested patients that an analysis of three large trials found that successful primary surgery increased progression-free and overall survival in ovarian cancer patients who had been platinum-free for at least 12 months.
  • Note that this study was published as an abstract and presented at a conference. These data and conclusions should be considered to be preliminary until published in a peer-reviewed journal.