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Mediastinal staging in early-stage NSCLC
1. Mediastinal Staging in Clinical Stage I and II NSCLC
Mauricio Lema Medina MD
Clínica de Oncología Astorga / Clínica SOMA, Medellín, Colombia
Medellín, 21.05.2018
6. Mediastinal LN status MUST be as
accurate as posible BEFORE undergoing
surgery with curative intent
7. Importance of N status in M0 NSCLC
cT1-3 cN0/N1 cT1-3 cN3cT1-3 cN2
Surgery
Pre-Op/Definitive
Chemo-RT
Definitive Chemo-RT
8.
9. CT-scan
Contrast-enhanced
Thorax, liver & adrenal
Silvestri GA, et al. Chest, 2013
Radiographic group A: mediastinal infiltration that encircles
the vessels and airways, so that discrete lymph nodes can
no longer be discerned or measured
Radiographic group B: mediastinal infiltration in whom the
size of discrete nodes can be measured
Radiographic group C: central tumor (within proximal 1/3
of the thorax) or suspected N1 disease (Level 10 ≥1 cm)
(N2/N3 risk in the 20-25% range).
Radiographic group D: peripheral clinical stage I
10. CT-scan
“For patients with extensive mediastinal
infiltration of tumor and no distant metastases,
it is suggested that radiographic (CT)
assessment of the mediastinal stage is usually
sufficient without invasive confirmation”
Silvestri GA, et al. Chest, 2013
RUL cancer
Radiographic groups A and B
11. CT-scan
“…the most widely used
criterion is a short-axis lymph
node diameter of 1 cm on a
transverse CT scan.”
Silvestri GA, et al. Chest, 2013
12. CT-scan
“…the most widely used
criterion is a short-axis lymph
node diameter of 1 cm on a
transverse CT scan.”
Prenzel KL, Chest, 2003
2891 resected hilar and mediastinal nodes
101/139 (77%) patients with pN0 had at least 1
node > 1 cm
256 patients
14/117 (12%) patients with pN2/pN3 had no
nodes greater than > 1 cm
13. CT-scan
“…the most widely used
criterion is a short-axis lymph
node diameter of 1 cm on a
transverse CT scan.”
Silvestri GA, et al. Chest, 2013
14. CT-scan
“…the most widely used
criterion is a short-axis lymph
node diameter of 1 cm on a
transverse CT scan.”
Silvestri GA, et al. Chest, 2013
Sens Spec PPV NPV
15. 15
Mediastinal Staging with Chest CT
Sensitivity
PPV
Specificity
NPV
Prevalence of mediastinal metastasis
55%
58%
81%
83%
30%
17. 17
Mediastinal Staging with Chest CT
Sensitivity
PPV
Specificity
NPV
Prevalence of mediastinal metastasis
55%
58%
81%
83%
30%
18. 18
Mediastinal Staging with Chest CT
Clinical stage I
5-15% mediastinal LN involvement
CT-Chest: N0
The American Thoracic Society and The European Respiratory Society. Pretreatment evaluation of non-small-cell
lung cancer. Am J Respir Crit Care Med . 1997 ; 156 ( 1 ): 320 - 332
19. 19
Mediastinal Staging with Chest CT
Clinical stage I
5-15% mediastinal LN involvement
CT-Chest: N0
The American Thoracic Society and The European Respiratory Society. Pretreatment evaluation of non-small-cell
lung cancer. Am J Respir Crit Care Med . 1997 ; 156 ( 1 ): 320 - 332
20. "but it remains the best overall anatomic study available for the thorax.
CT scanning usually guides the choice of nodes for selective node biopsy
by invasive techniques, and thus continues to be an important
diagnostic tool in lung cancer.
The choice of individual nodes for sampling, as well as the choice of the
most appropriate invasive technique (including transbronchial,
transthoracic, or transesophageal NA; mediastinoscopy; or more
extensive surgery), are typically directed by the findings of the CT scan"
Mediastinal Staging with Chest CT
Silvestri GA, et al. Chest, 2013
28. High-risk LN station for primary
tumor location?
Short-axis size > than normal?
Central LN lipomatosis or
calcification
Non-pathologic LN
Pathologic LN
Non-pathologic
LN
Yes
YesNo
NoYes
Volterrani L. Eur J Radiol. 2011 Sep;79(3):459-66.
29. MSCT multi-criteria: a novel approach in assessment of mediastinal
lymph node metastases in non-small cell lung cancer.
Volterrani L. Eur J Radiol. 2011 Sep;79(3):459-66.
86 consecutive patients with histopathologically proven NSCLC. All patients underwent surgical lymph node resection
within 30 days from the CT examination. In all cases pathological and CT results were reviewed and correlated.
33. 33
Mediastinal Staging with MSCT-multicriteria
Sensitivity
PPV
Specificity
NPV
94-100%
94%
98.5%
98.5-100%
If confirmed
34. PET-CT
With FDG
Patients with known NSCLC and no suspicious extra thoracic abnormalities on chest
CT, additional imaging for metastases is recommended (ie, PET-CT)
Silvestri GA, et al. Chest, 2013
37. PET-CT
With FDG
Patients with known NSCLC and no suspicious extra thoracic abnormalities on chest
CT, additional imaging for metastases is recommended (ie, PET-CT)
Silvestri GA, et al. Chest, 2013
A reduction, from approximately 40% to 20%, in the
number of non curative resections performed
(defined as the presence of benign disease,
unsuspected N2 involvement, unresectable disease,
or death from any cause within 1-yr).
38. PET-CT
Meta-analysis of PET + CT in
mediastinal staging of NSCLC
n= 4105 patients
Silvestri GA, et al. Chest, 2013
39. PET-CT
Meta-analysis of PET + CT in
mediastinal staging of NSCLC
n= 4105 patients
Silvestri GA, et al. Chest, 2013
40. PET-CT
Meta-analysis of PET + CT in
mediastinal staging of NSCLC
n= 4105 patients
Silvestri GA, et al. Chest, 2013
Sens Spec PPV NPV
41. PET-CT
Meta-analysis of PET + CT in mediastinal
staging of NSCLC
Years 2004-2011
n= 2,014 patients
Silvestri GA, et al. Chest, 2013
42. 42
Mediastinal Staging with PET-CT
Sensitivity
PPV
Specificity
NPV
Prevalence of mediastinal metastasis
80%
75%
88%
91%
28%
43. “In nodes less than 1 cm, the sensitivity of FDG-PET-CT to detect nodal
metastasis is not optimal and has been reported as sensitivity or 32.4%
versus 85.3% in nodes greater than or equal to 1 cm.”
Billé A, et al. Eur J Cardiothoracic Surg, 2009
44. 44
Mediastinal Staging with PET-CT
Clinical peripheral stage I
4% mediastinal LN involvement
PET-CT: N0
Kozower BD , Meyers BF , Reed CE , Jones DR , Decker PA , Putnam JB Jr . Does positron emission tomography
prevent nontherapeutic pulmonary resections for clinical stage IA lung cancer? Ann Thorac Surg . 2008 ; 85 ( 4 ):
1166 - 1169.
45. 45
Mediastinal Staging with PET-CT
Clinical peripheral stage I
4% mediastinal LN involvement
PET-CT: N0
Kozower BD , Meyers BF , Reed CE , Jones DR , Decker PA , Putnam JB Jr . Does positron emission tomography
prevent nontherapeutic pulmonary resections for clinical stage IA lung cancer? Ann Thorac Surg . 2008 ; 85 ( 4 ):
1166 - 1169.
46. "One should not preclude a potential curative surgery based on a
positive PET scan alone without tissue confirmation."
Mediastinal Staging with PET CT
Silvestri GA, et al. Chest, 2013
47. "However, PET scanning is the most accurate noninvasive imaging
modality available to evaluate the mediastinum in patients with lung
cancer.
PET scanning is also a whole-body study (excluding the brain), offers
additional information relating to extrathoracic sites of possible disease
involvement, and can reduce noncurative resections.
PET scanning has now assumed a central role in the staging of lung
cancer.”
Mediastinal Staging with PET CT
Silvestri GA, et al. Chest, 2013
49. Neural Networks for Nodal Staging of Non–Small Cell Lung Cancer with
FDG PET and CT: Importance of Combining Uptake Values and Sizes of
Nodes and Primary Tumor
Toney LK, Radiology, 2014
“The authors developed a back-
propagation ANN with one hidden layer
and eight processing units”.
50. Neural Networks for Nodal Staging of Non–Small Cell Lung Cancer with
FDG PET and CT: Importance of Combining Uptake Values and Sizes of
Nodes and Primary Tumor
Toney LK, Radiology, 2014
51. Neural Networks for Nodal Staging of Non–Small Cell Lung Cancer with
FDG PET and CT: Importance of Combining Uptake Values and Sizes of
Nodes and Primary Tumor
Toney LK, Radiology, 2014
52. 52
Mediastinal Staging with ANN PET-CT
Correct prediction of N stage
Correct prediction of N0/1 vs N2/3
99%
99%
72%
92%
ANN Expert reader
ANN: Artificial Neural Network
Toney LK, Radiology, 2014
53. 53
Mediastinal Staging with ANN PET-CT
Correct prediction of N stage
Correct prediction of N0/1 vs N2/3
99%
99%
72%
92%
ANN Expert reader
ANN: Artificial Neural Network
Toney LK, Radiology, 2014
54. 54
Mediastinal Staging with ANN PET-CT
Correct prediction of N stage
Correct prediction of N0/1 vs N2/3
99%
99%
72%
92%
ANN Expert reader
ANN: Artificial Neural Network
Toney LK, Radiology, 2014
If confirmed
56. Pancoast syndrome is characterized by a
malignant neoplasm of the superior sulcus of the
lung with destructive lesions of the thoracic inlet
and involvement of the brachial plexus and
cervical sympathetic nerves (stellate ganglion, go
here).
This is accompanied by
(1) severe pain in the shoulder region
radiating toward the axilla and scapula along the
ulnar aspect of the muscles of the hand,
(2) atrophy of hand and arm muscles,
(3) Horner syndrome (ptosis, miosis,
hemianhidrosis, enophthalmos), and
(4) compression of the blood vessels with
edema.
Silvestri GA, et al. Chest, 2013
57. Chest MRI
MRI of the chest should not be performed
routinely for staging of the mediastinum.
MRI is useful in patients with NSCLC when
there is concern about involvement of the
superior sulcus or the brachial plexus.
Silvestri GA, et al. Chest, 2013
58. Mediastinoscopy
“…involves an incision just above the
suprasternal notch, insertion of a
mediastinoscope alongside the trachea,
and biopsy of mediastinal nodes.”
Silvestri GA, et al. Chest, 2013
Morbidity: 2%
Mortality: 0.08%
59. 2R
4R
7
2L
4L
1
3a
Mediastinoscopy
Node groups that cannot undergo a
biopsy with this technique include:
Posterior subcarinal (station 7)
Inferior mediastinal (stations 8, 9),
Aortopulmonary window (APW) (station 5)
Anterior mediastinal (station 6) nodes.
60. Mediastinoscopy
“…involves an incision just above the
suprasternal notch, insertion of a
mediastinoscope alongside the trachea,
and biopsy of mediastinal nodes.”
Silvestri GA, et al. Chest, 2013
61. Mediastinoscopy
“…involves an incision just above the
suprasternal notch, insertion of a
mediastinoscope alongside the trachea,
and biopsy of mediastinal nodes.”
Silvestri GA, et al. Chest, 2013
Sens Spec PPV NPV
62. Video Assisted Mediastinoscopy
“…A videomediastinoscope allows better visualization, more extensive
sampling (including posterior station 7)…”
Silvestri GA, et al. Chest, 2013
67. Video-Assisted Thoracic Surgery
“This is performed under general
anesthesia and, in general, is limited
to an assessment of only one side of
the mediastinum.
Access to the R-sided nodes is
straightforward, but access to the L
paratracheal nodes is more difficult”
Silvestri GA, et al. Chest, 2013
Morbidity: 2%
Mortality: 0%
90. 90
Minimally Invasive Endoscopic Staging of
Suspected Lung Cancer
TB-NA
PPV
EUS-NA
EUS-NA & EBUS-NA
EBUS-NA
Wallace MB, JAMA, 2008
36%
69%
69%
93%
78%
88%)
88%
97%
Sensitivity NPV
138 consecutive non(obviously) metastatic NSCLC underwent all three procedures
91. 91
Minimally Invasive Endoscopic Staging of
Suspected Lung Cancer
TB-NA
PPV
EUS-NA
EUS-NA & EBUS-NA
EBUS-NA
Wallace MB, JAMA, 2008
36%
69%
69%
93%
78%
88%)
88%
97%
Sensitivity NPV
138 consecutive non(obviously) metastatic NSCLC underwent all three procedures
92. 92
Endobronchial ultrasound versus mediastinoscopy for mediastinal
nodal staging of non-small-cell lung cancer
Sensitivity
PPV
Specificity
NPV
Accuracy
Um SW, JTO, 2015
88%
93%
100%
85%
81%
89%)
100%
78%
EBUS-TBNA Mediastinoscopy
138 consecutive NSCLC with cN1-cN3
*
*
*
* p < 0.005
93. 93
Endobronchial ultrasound versus mediastinoscopy for mediastinal
nodal staging of non-small-cell lung cancer
Sensitivity
PPV
Specificity
NPV
Accuracy
Um SW, JTO, 2015
88%
93%
100%
85%
81%
89%)
100%
78%
EBUS-TBNA Mediastinoscopy
138 consecutive NSCLC with cN1-cN3
*
*
*
* p < 0.005
94. 94
EBUS-centred versus EUS-centred mediastinal
staging in lung cancer: a randomized controlled
trial
Group A (EBUS-NA then EUS-NA)
PPV
EBUS after EUS improves accuracy and sensitivity. Therefore,
EBUS-FNA should be first
Kang HJ, Thorax, 2014
92%
86%
93%
97%
Accuracy post 1st test - Sensitivity Accuracy post 2nd test - Sensitivity
160 patients with histologically confirmed or strongly suspected potentially operable NSCLC
Group B (EUS-NA then EBUS-NA)
82%
60%
85%
92%
95. 95
P O S I T I O N S T A T E M E N T
My practice take…
96. 96
Known or suspected NSCLC
Contrast-Enhanced Chest CT (+liver & adrenal)
Negative / borderline positive Chest CT, clinical stage I/II
FDG PET-CT
VATS or EBUS/EUS-NA
Massive N2/N3 disease on
Chest CT
No further mediastinal
work-up
PET-CT(-) and
peripheral cI
No further mediastinal
work-up
PET-CT(+)
Tissue confirmation
required
PET-CT(-)
Context-based strategy