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open access
May 26, 2016
Society Position Statements/White Papers
Impact of bevacizumab containing first line chemotherapy on recurrent disease in epithelial ovarian cancer: A case-control study
Highlights
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- Incorporation of bevacizumab into upfront regimens prolongs PFI in AOC patients.
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- However, it is associated with wider presentation of relapse, and lower rate of complete SCS.
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- TTP to second line chemotherapy was shorter in women with platinum-sensitive relapse initially treated with bevacizumab.
Abstract
Objective
To
evaluate the timing and pattern of relapse, and duration of response to
second line chemotherapy in advanced ovarian cancer (AOC) patients
treated with first line carboplatin-paclitaxel chemotherapy with or
without bevacizumab.
Patients and methods
This
is a case-control study including 222 AOC patients. Seventy-four women
treated with first line carboplatin-paclitaxel-bevacizumab chemotherapy
(Cases) were matched based on laparoscopic predictive index value, and
residual tumor at first surgery with 148 AOC patients treated with
carboplatin-paclitaxel. Distribution of pattern of relapse, and response
to second line chemotherapy was compared between the two groups. Time
to Progression (TTP) for second line chemotherapy was also analyzed for
study purpose.
Results
Median
platinum-free interval (PFI) was 16 months (range 2–65) in Cases,
compared with 9 months (1–83) in Controls (p-value = 0.001). Twenty
patients (51.3%) among Cases showed recurrence in multiple anatomic
sites, compared with 31 (31.9%) in the Control group (p-value = 0.035).
Peritoneal recurrence occurred as diffuse in 30 Cases (96.8%), and 60
Controls (82.2%; p-value = 0.046). Secondary cytoreductive surgery (SCS)
was successfully completed in 53.5% of Controls compared to 10.0% of
Cases (p-value = 0.016). In women with fully platinum-sensitive relapse,
response rate to second line chemotherapy was 85.2% in Controls,
compared to 38.4% in Cases (p-value = 0.002). Finally, Cases showed a
shorter TTP, compared to Controls (5 months vs 8 months;
p-value = 0.041).
Conclusions
Incorporation
of bevacizumab into upfront regimens prolongs PFI in AOC patients, but
is associated with wider presentation of relapse, lower rate of complete
SCS, and shorter TTP to second line chemotherapy in women with
platinum-sensitive disease.
1. Introduction
In
the past decade, the results of two pivotal randomized phase III
clinical trials demonstrated a significant improvement of
progression-free survival (PFS), in patients with advanced ovarian
cancer (AOC) receiving bevacizumab as part of first line treatment [1] and [2].
Based on these data, in December 2011, Avastin received European
regulatory approval for use in combination with carboplatin-paclitaxel
as upfront chemotherapy regimen in OC patients with advanced disease.
The
observed prolongation of PFS should be considered a relevant
therapeutic achievement, since it delays the onset of physical symptoms
associated with progressive disease, as well as the need to start a
second-line chemotherapy. Furthermore, the prolongation of PFS may in
principle increase the chance of response to further platinum-based
treatments [3], thus offering a potential long-term benefit.
However,
in this encouraging scenario, it is reasonable to hypothesize that the
incorporation of bevacizumab into first-line treatment may exert an
additional selective pressure on OC cells, with a potentially relevant
impact on the natural history of this malignancy. This hypothesis is
also supported by recently published retrospective data, which
demonstrated a higher rate of lung and pleural recurrence in AOC
patients receiving bevacizumab as part of primary treatment [4],
thus suggesting that more efforts should be done to definitely clarify
how bevacizumab will change the clinical features of OC. Furthermore,
despite initial promising results [5] and [6],
it remains to be validated an effective signature able to properly
identify at diagnosis those AOC patients who may real benefit from first
line bevacizumab-based chemotherapy.....
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