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Journal Thoracic Oncology

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Abstracts <strong>Journal</strong> of <strong>Thoracic</strong> <strong>Oncology</strong> • Volume 12 Issue S1 January 2017<br />

Study<br />

type<br />

#<br />

pts<br />

drugs<br />

Completed<br />

Chemotherapy<br />

Completed<br />

Surgery<br />

Completed<br />

Radiotherapy<br />

Outcome<br />

(mOS)<br />

SAKK 17/04 Lancet<br />

Onc 2015;16;1651<br />

Neo-adj 151 Cis/pem 145 125<br />

23/27 in 2nd<br />

stage<br />

7.6-9.4<br />

Frederico BMC<br />

Cancer 2013;13;22<br />

Krug JCO<br />

2009;27;3007<br />

Weder JCO<br />

2004;22;3451<br />

Van Schil ERJ<br />

2010;36;1362<br />

Neo-adj 54 Cis/pem 96% 83% 41% 15.5<br />

Neo-adj 77 Cis/pem 83% 74% 52% 16.8<br />

Neo-adj 20 Cis/gem 90% 80% n.a. 23<br />

Neo-adjuvant 59 Cis/pem 93% 79% 65% 18.4<br />

Richards JCO<br />

2006;24;1561<br />

intracavitary 61<br />

Cispl 50-<br />

225<br />

n.a. 72% n.a. 9.0<br />

Tilleman JTCS<br />

2009;138;405<br />

intracavitary 121 Cispl 225 n.a 79% n.a. 12.8<br />

Keywords: surgery; mesothelioma; chemotherapy<br />

ED13: TREATMENT OF MALIGNANT PLEURAL MESOTHELIOMA<br />

WEDNESDAY, DECEMBER 7, 2016 - 11:00-12:30<br />

ED13.05 SYSTEMIC THERAPY OF INOPERABLE MALIGNANT<br />

PLEURAL MESOTHELIOMA<br />

Arnaud Scherpereel<br />

Pulmonary and <strong>Thoracic</strong> <strong>Oncology</strong>, Hospital of the University (CHRU) of Lille, Lille/<br />

France<br />

To date, the treatment of malignant pleural mesothelioma (MPM), a rare and<br />

aggressive tumor usually induced by previous asbestos exposure, relies mostly<br />

on chemotherapy and best supportive care (BSC). But medical treatment has<br />

been so far quite deceptive with median overall survival (mOS) about one year<br />

at its best for the last 13 years with recommended first line chemotherapy by<br />

cisplatin (or carboplatin) and pemetrexed in patients fitted for it. The optimal<br />

duration of first line chemotherapy is unknown but a maximum of 6 cycles is<br />

recommended. There was no evidence supporting maintenance treatment by<br />

pemetrexed or other drug. Pathogenesis of MPM includes overexpression of<br />

growth factors, many genetic and epigenetic alterations and/or mutations of<br />

malignant cells responsible for cell proliferation and resistance to apoptosis,<br />

pleural inflammation and local immunosuppression induced by the tumor and<br />

favoring its growth. These elements provide the rationale for many targeted<br />

therapies and immunotherapy. But so far, very few drugs exhibited sufficient<br />

value to deserve further trials. Thus, first trials assessing anti-angiogenic drugs<br />

in MPM did not support their use in this cancer despite the key role of VEGF.<br />

A phase III testing thalidomide as maintenance treatment after cisplatin/<br />

pemetrexed (Cis/Pem) was negative, as well as phase II trial of bevacizumab<br />

(anti-VEGF antibodies) combined with first line cisplatin/gemcitabine. But<br />

other phase II trials evaluating bevacizumab with Cis or Carbo/Pem were<br />

promising with progression-free survival (PFS) of 6.9 months. Therefore, a<br />

phase III randomized (1:1) « MAPS » trial recruited 448 unresectable MPM<br />

patients to test Cis/Pem with (arm B) or without (arm A) bevacizumab.<br />

Arm B non-progressive patients received bevacizumab maintenance until<br />

progression or toxicity. Median overall survival (mOS) was significantly longer<br />

in the B arm: 18.8 [95%CI: 15.9-22.6] vs. 16.1 months [14.0-17.9] in the A arm,<br />

(adj.HR= 0.76, p=0.012). Thus, bevacizumab addition to Cis/Pem provided a<br />

significantly longer survival in MPM patients with acceptable toxicity, making<br />

this triplet a new treatment paradigm for this cancer. Moreover, there was<br />

no detrimental effect of bevacizumab on quality of life (QoL) despite its<br />

higher specific but manageable toxicity. There was no significant difference<br />

between arms for the percentages of drug delivery or of second line treatment<br />

to explain why adding bevacizumab to Cis/Pem significantly increased mOS,<br />

even if MAPS standard arm patients had a longer OS than patients from<br />

historical series or previous trials. Based on the same rationale than the<br />

MAPS trial, nintedanib, a drug targeting VEGF, FGF and PDGF receptors, is<br />

currently tested versus placebo in MPM patients treated by first line Cis/<br />

Pem chemotherapy in a large phase II/III randomized trial. Early I or II trials<br />

assessing drugs targeting mesothelin, a mesothelial cell surface molecule<br />

overexpressed in (mostly epithelioïd) MPM, showed promising results in<br />

combination with first-line Cis/Pem, justifying further, randomised and<br />

larger studies. Thus, very interesting trials are ongoing with anti-mesothelin<br />

monoclonal antibodies (mAbs) alone (amatuximab, a chimeric IgG1 antibody),<br />

or planned with immunotoxins (mAbs combined with anti-tubulin (anetumab<br />

ravsantine) or Listeria toxins (CRS-207) versus placebo combined with Cis/<br />

Pem too. For non-epithelioïd MPM patients, another hope might come from<br />

the dependence to arginin exhibited by argininosuccinate synthetase -1 (ASS-<br />

1) tumors such as mesothelioma, and the good results of Pegylated Arginine<br />

Deiminase (ADI-PEG 20) alone or in combination with Cis/Pem, assessed in<br />

the phase I « TRAP » trial recently presented by Szlosarek and al. A phase II/<br />

III trial (Polaris), comparing first line Cis/Pem with ADI-PEG 20 or placebo,<br />

will start in 2017 for biphasic (mixed) or sarcomatoïd MPM only because they<br />

exhibit ASS-1 defect twice more frequently than epithelioïd subtype. Finally,<br />

other innovative drugs also candidates for first line treatment in combination<br />

with Cis/Pem, after preliminary positive clinical trials, include gene therapy,<br />

cell therapy using chimeric antigen receptors (CARs) or dendritic cells (DC), or<br />

oncovirotherapy, and will be assessed as first line treatment in MPM very soon<br />

or later. For example, the European “DENIM” phase III trial will test DC based<br />

immunotherapy with allogenic tumor cell lysate as maintenance treatment<br />

after Cis/Pem chemotherapy in MPM patients. But, as in lung cancers,<br />

immune checkpoint inhibitors (ICI) seem to represent presently the most<br />

exciting tool for MPM patients. In fact, even if a recent, large phase II trial<br />

(n=564; “Determine”) with anti-CTLA-4 mAb (tremelimumab) versus placebo<br />

in 2 nd /3rd line treatment did not meet its first endpoint (mOS) (21), early<br />

data of a phase Ib basket trial with anti-PD-1 mAb (pembrolizumab) showed<br />

promising response rate (RR) of 28% and DCR of 76% in PD-L1 positive MPM<br />

(22). Other trials with checkpoint inhibitors are ongoing with anti-PD-1 alone<br />

(nivolumab, pembrolizumab), or a combination of anti-PD-1 (nivolumab) or<br />

anti-PD-L1 (durvalumab) and anti-CTLA-4 (tremelimumab or ipilimumab) as<br />

first or 2 nd /3rd lines treatment. Interestingly, new clinical trials are already<br />

underway to assess value of ICI, such as nivolumab + ipilimumab combo,<br />

versus Cis/Pem as first line treatment. In conclusion, the triplet cisplatin/<br />

pemetrexed/bevacizumab may be a new first line standard of care for patients<br />

eligible for bevacizumab, and not candidate to multimodal treatment trials.<br />

Second line and further lines treatments are very limited with no validated<br />

options except pemetrexed in case of late relapse after platinum/pemetrexed.<br />

But exciting drugs and strategies were tested in this testing, in particular ICI.<br />

But remaining key questions include which predictive biomarkers for these<br />

innovative, thrilling but expensive treatments to target the best patients<br />

for each drug? And how to potentially combine these drugs versus, or in<br />

combination with, standard chemotherapy? Thus real hopes seem closer for<br />

our MPM patients with new systemic treatments.<br />

Keywords: Mesothelioma, chemotherapy, Immunotherapy, systemic<br />

treatment<br />

ED13: TREATMENT OF MALIGNANT PLEURAL MESOTHELIOMA<br />

WEDNESDAY, DECEMBER 7, 2016 - 11:00-12:30<br />

ED13.06 MESOTHELIOMA IN A SETTING OF GERMLINE BAP1<br />

MUTATIONS<br />

Michele Carbone 1 , Harvey Pass 2 , Haining Yang 1<br />

1 <strong>Thoracic</strong> <strong>Oncology</strong>, University of Hawaii Cancer Center, Hawaii/HI/United States<br />

of America, 2 Department of Cardiothoracic Surgery, NYU Langone Medical Center,<br />

New York/NY/United States of America<br />

Individuals that are born with germline BAP1 mutations are affected by the<br />

BAP1 cancer syndrome. All individuals affected by this cancer syndrome have<br />

developed one or more malignancies in the course of their life. Mesothelioma,<br />

uveal and cutaneous melanomas –tumors often associated with exposure to<br />

environmental carcinogens-, are the most common malignancies, although<br />

almost any tumor type has been detected in carriers of this cancer syndrome.<br />

In addition, BAP1 mutant carriers develop multiple benign melanocytic<br />

tumors –histologically different from other SPITZ-like tumors- that we have<br />

called melanocytic BAP1 associated intradermal tumors (MBAITs) that can<br />

S30 <strong>Journal</strong> of <strong>Thoracic</strong> <strong>Oncology</strong> • Volume 12 Issue S1 January 2017

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