recent advances in diagnosis and management of early gastric cancer recent advances in diagnosis and...
TRANSCRIPT
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RECENT ADVANCES IN DIAGNOSIS AND MANAGEMENT OF EARLY
GASTRIC CANCER
Professor Ravi KantFRCS (England), FRCS (Ireland),
FRCS(Edinburgh), FRCS(Glasgow), MS, DNB, FAMS, FACS, FICS,
Professor of Surgery
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DEFINITION
Early gastric cancer (EGC) is defined as tumour confined to mucosa & submucosa irrespective of lymph node involvement
Due to wide variation in the survival of lymph node + and – cases, the definition of EGC should be modified to gastric malignancy confined to the mucosa & submucosa without the involvement of lymph nodes.
Gastric Cancer 2000; 3:219-225
Br J Surg 1991; 78: 818-21.
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INCIDENCE
In Korea the incidence of EGC increased from 15% to 30% in 2 years from 1992 to 1994.
The percentage of EGC varies from 6 to 16% in western countries
This can be partly explained by the fact that Japanese include adenoma and dysplasia as a part of EGC
• World Journal of Surgery 1998; 22:1059
• Arch Surg 2000; 135: 1218-23.
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PROGNOSTIC FACTORS
The most important prognostic factor for EGC is the presence of lymph node metastasis.
Lymph node involvement in EGC depends upon the following factors
1. Tumour size2. Gross appearance3. Depth of invasion4. Histological pattern5. Lymphatic/vascular invasion
Ann Surg Oncol 1999; 6(7): 664-70
Int Surg 1998; 83(4): 287-90.
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PROGNOSTIC FACTORS Tumour size
Tumours smaller than 30mm. have a very low incidence of lymph node involvement.
As the diameter increases, they tend to be more undifferentiated, with significantly higher incidence of lymph node involvement.
Gastric Cancer 2000; 3:219-225.
Br J Surg 1998; 85: 835-39.
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PROGNOSTIC FACTORS Gross Appearance
The following tend to have a high rate of lymph node metastasis:
Type I and IIA lesions, depressed or mixed type
lesions, lesions with ulceration
World Journal of Surgery 1998; 22:1059
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PROGNOSTIC FACTORS Depth of invasion
The submucosa can be divided into 3 equal parts Sm1, Sm2 and Sm3.
incidence of lymph node metastasis varies from 2% to 12% and 20% according to the level of submucosa involved
Br J Surg 1991; 78: 818-21.
Br J Surg 1998; 85: 835-39.
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PROGNOSTIC FACTORS Histological pattern
The following have significantly higher rates of lymph node metastasis:
Undifferentiated carcinoma, diffuse type of malignancy and tumour with histological ulceration
Cancer 1999; 85(7): 1500-5
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PROGNOSTIC FACTORS Lymphatic invasion
The following are risk factors for lymph node involvement:
Large tumour size (>/= 30mm.) Involvement of lymphatic vessels Invasion of submucosal layer Poorly differentiated type Macroscopic depressed type Histological ulceration of the tumour Microscopically diffuse type Antral lesions Depressed/mixed type Type I and IIa
• Gastric Cancer 2001; 4: 34-38
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Lymph node distribution
Mainly group 1 location lymph nodes are involved in EGC and involvement of groups 2 and 3 is rare.
Sentinel lymph node involvement concept in gastric cancer has not yet been established
J Surg Oncol 1997; 64(1): 42-47
Surg Today 1997; 27: 600-605.
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DIAGNOSIS
To determine the depth of invasion and the
presence of lymph node metastasis, the
following investigations have been used:– Virtual Endoscopy – Magnifying Endoscopy – Fluorescence Endoscopy – Endoscopic Ultrasonography
Jr Comput Assist Tomogr 1998: 22: 709-713.
Am J Roentol. 1997; 169: 787-789.
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DIAGNOSISVirtual Endoscopy
using Helical CT system for 3D reconstruction with the volume rendering technique
Elevated lesions (EGC I and IIa) were better depicted rather than non-elevated lesions (EGC IIb and IIc).
Fine mucosal details, colour changes, textures and hyperaemia evident by conventional gastroscopy are not well depicted by Virtual Gastroscopy.
• Am J Roentol. 1997; 169: 787-789.
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DIAGNOSISMagnifying Endoscopy
Histopathological results were compared with findings of magnifying endoscopy regarding surface structures and microvessels.
There was a definitive correlation between the small, regular mucosal pattern of sulci and ridges and differentiated carcinoma.
Endoscopy 2004; 36(2): 165-169
.
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DIAGNOSISFluorescence Endoscopy
Exogenously applied sensitizers (5-aminolaevulanic acid) accumulate selectively in malignant lesions and induce fluorescence after illumination with light of adequate wavelength
Better detection of non-visible malignant or premalignant lesions
.
Dig Liver Dis 2002; 34(10): 754-761
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DIAGNOSISEndoscopic Ultrasonography
useful tool in differentiating early from late carcinoma of the stomach (accuracy of 91%)
low accuracy rate in differentiating between mucosal & submucosal cancer (accuracy rate 63.7%).
accuracy rates for detecting intramucosal cancer using endoscopy and endosonography were 84% and 78% respectively
Endoscopy 2002; 34(12): 973-978.
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CLINICAL PRESENTATION
Asymptomatic: The patient can be absolutely asymptomatic and malignancy picked up by mass screening or selective screening
Upper GI dyspepsia: Every patient who presents with dyspepsia after 50 years of age should undergo Upper GI endoscopy
Surgical Oncology 2000; 9: 17-22.
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Biochemical
Tumor MarkersCEA ▲ in 1/3 patients ≈ stageCEA + Ca 19-9 or CA 50
↑ sensitivity
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CA Stomach : significance of tumor marker
β HCG CA 125 CEA alpha fetoprotein CA 19-9, tissue staining for C - erb B 2
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CA 125, β HCG
Pre-op indicator of aggression tumor burden Prognostic
“Botet”
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Diagnosis
Auto-fluorescenceEndoscopic UltrasoundOptical Coherence
TomographyVirtual Biopsy
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Endoscopy
Size, location, morphology of lesion
Mucosal abnormality, bleedingProximal and distal spread of
tumorDistensibility
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Endoscopy
Abnormal motility ► SM infiltration, extramural extension – vagal infiltration
Bx–6 – 10 – 90% accuracy
Early Ca → 0.1% indigocarmine dye test
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EUS
Good for T & NNot good for M
Radial probes –7.5 or 12MHz better for Biopsy
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T 1
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T 2
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T 3
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OCT / Virtual Biopsy
Optical coherence tomography
Beyond routine endoscopy
Differentiates - benign and malignant, mucosal dysplasias
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LIFE
Light Induced Fluorescence Endoscopy
Early detection of dysplasias and superficial malignant lesions, in situ Ca
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Contrast Radiography Motility – Ba meal, hypotonic
duodenography
Structural changes
Diagnostic accuracy: – Single – 80%– Double – 90%
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Computed TomographyAbdomen and chestLateral extension, Systemic mets-
75%Triphasic spiral CT – T stage,
stomach filled with water Tako et al 1998 – Adv gastric Ca – 82% Early Ca – 15%
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CT – T Staging
Gastric distensionDoes not differentiate T1 and T2T3 stranding in perigastric fatDoes not differentiate transmural
and perigastric lymphadenopathyAccuracy 80 – 88% in Advanced
disease
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CT – N Staging
Size – no predictor of involvement> 8mm sensitivity – 48%,
specificity 93% Identifies distal nodes (not seen on
EUS)No of involved nodes N1 1 -6
RLN according to current TNM classification
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CT – M Staging
Liver mets – thin collimation, overlapping slides, dual phase imaging
75 – 80 % mets detected
Small volume ascites – EUS and CT
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Conventional US
Good clinical evidence of liver mets
When treatment options are limited – before palliation
Used in conjunction with or, alternative to MRI – indeterminate lesions on CT
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MRI
T assessment – No evidence that MRI better than CT
For identification of indeterminate lesions
IV contrast allergyEndoluminal MR – experimental
only and no advantage over EUS
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PET
FDG (fluorodeoxyglucose) 18 FPreferrential accumulation of PEG
in tumourSensitivity 60%, specificity 100%,
Accuracy 94%Detects 20% missed mets on CTDifferentiates: malignancy from
inflammation
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PET+CT Combo
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Laparoscopy
Peritoneal Disease M1 – CT, EUS, Small volume ascites
Routine use after CT / EUS before radical surgery
Additional information than CTComplementary to CT / EUSAccuracy 84%
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Laparoscopy US Probes
III dimension in US – detects unsuspected liver and lymphnode metastases
Eliminates need for laparotomy
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Mechanism of Photo-toxicity
Release of singlet oxygenS phase cells more vulnerable than
G phase cells
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Inside Story – Wonder Pill
Pill with a camera – M2 APictures taken at 2 frames per
secondMicrochip in camera with 8 hour
batteryReceiver in the beltAmbulatory endoscopic monitoring
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Camera Pill
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Rx EGC
1. Endoscopic
2. Laparoscopic
3. Conventional
• Surgical Oncology 2000; 9: 17-22.
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Endoscopic Rx
1. Strip Biopsy – using the grasp & pull technique with a double channel endoscope.
2. Aspiration Mucosectomy – using the cup & suction technique.
3. Resection using a double polypectomy snare
4. Resection with the combined use of highly concentrated saline & epinephrine.
• Gut 2001; 33: 709 – 718.
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Lap Rx
1. Laparoscopic wedge resection using lesion lifting method for tumours along the greater curvature or on the anterior wall
of the stomach.
2. Laparoscopic intragastric mucosal resection: For lesions of the posterior wall of the stomach and for lesions near the cardia or the pylorus. World J Surg 1999; 23: 187-
192.
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Conventional Rx
Since 1881 Billroth I gastrectomy has been the gold standard for the treatment of gastric cancer.
EGC has been safely and successfully managed by this conventional gastrectomy because perigastric lymph nodes are completely harvested by this technique.
• Gastric Cancer 1999; 2:230-234.
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TREATMENTNewer surgical management
1. Segmental gastrectomy
2. Proximal gastrectomy
3. Wedge resection
4. Pylorus-preserving distal gastrectomy
Br J Surg 1999; 86: 526-528.
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< 4 cm Tumor =Segmental gastrectomy
intra-operative endoscopy and frozen section analysis of the dissected perigastric lymph nodes is carried out.
If nodes are +, then the procedure is converted to a conventional gastrectomy with an extended lymphadenectomy.
If nodes are -, segmental gastrectomy with a tumour free resection margin of 2 cm is adequate
Br J Surg 1999; 86: 526-528.
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Newer surgical management Proximal gastrectomy
Proximal Gastrectomy (with jejunal interposition) was described by Takeshita et al for proximal 1/3 of the stomach
• Surgery 1997; 121: 278-286
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Newer surgical management Pylorus-preserving gastrectomy
for EGC in the middle stomach In this technique a pyloric cuff of 2 cm. is
preserved while the distal 2/3 of the stomach is removed
Advantages are decreased incidence of post-gastrectomy dumping syndrome and gall bladder stone formation. Weight recovery is better.
Sometimes emptying disturbances can be present which can be relieved by Cisapride.
• Surgery 1998; 123: 165-170.
• World J Surg 1998; 22: 35-41.
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Newer surgical managementLymph node management
No lymph node dissection is recommended for mucosal tumours
(the lymph node metastasis in mucosal gastric cancer only 2.4 % and preservation of regional lymph nodes may enhance post-operative immunocompetence.
Cancer 2000; 89: 1425-1430.
Am J Surg 2000; 180: 127-132.
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Newer surgical managementLymph node management
In patients with submucosal tumours, extended lymphadenectomy has been shown to prolong survival, especially when these tumours are located in the distal 1/3 of the stomach.
Cancer 2000; 89: 1425-1430.
Am J Surg 2000; 180: 127-132.
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PLANNING OF TREATMENT Endoscopic Mucosal Resection
(EMR) should be used initially for all patients with EGC
If histology reveals complete resection, the treatment is complete & only regular F/U reqd.
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Incomplete resection
–For mucosal tumours, Laparoscopic Local Resection
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Incomplete resection
– for mucosal tumours with ulceration or Sm 1a, Laparoscopy-Assisted Gastrectomy with D1 lymph
node dissection .
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Incomplete resection
– for Sm 1b, Gastrectomy with D2
lymph node dissection is indicated.
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Extent of lymph node dissection 1. Mucosal tumour < 30 mm: No
lymph node dissection required.
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Extent of lymph node dissection Mucosal tumour > 30 mm:
Dissection of local perigastric lymph nodes (D1) only.
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Extent of lymph node dissection
Submucosal tumour: D1 dissection along with dissection of lymph nodes along the left gastric artery, antero-superior common hepatic artery, celiac artery and proximal portion of the splenic artery.
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Survival rate for endoscopic mucosal resection(EMR)
98 patients who had successful EMR there was no tumor related deaths during a median follow up of period of 38 months.(Gut2001:48;225-9)
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Survival rate for Laparoscopic wedge resection
57 patients who had successful LAPAROSCOPIC WEDGE RESECTION , no patient died of disease during median follow up period of 65 months (World Journal of Surgery1999:23;187-92)
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SUMMARY
The incidence of EGC is on the rise because of aggressive screening by upper GI endoscopy.
Lymph node metastasis is the most important prognostic factor (has a higher recurrence rate and a significantly lower survival rate).
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SUMMARY
Incidence of lymph node metastasis is much higher in submucosal lesions.
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SUMMARY
Endoscopic ultrasonography has an important role in preoperative evaluation of lymph node metastasis and for differentiation between mucosal and submucosal lesions.
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SUMMARY
Endoscopic mucosal resection and Laparoscopic gastrectomy are two minimally invasive procedures which are becoming the standard of care for management of EGC.
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THANK YOU
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R1
R & L cardiac LNLN along lessor and greater
curvaturesupra and infra pyloric LN
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R2=R1+ LNs
along / at / aroundL gastric Acommon hepatic Acoeliac Asplenic hilumsplenic A.
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R3 = R1 + R2 +LN
hepato-duodenal ligamentretropancreatico-duodenalroot of mesentriumMiddle colic A.Around abdominal aorta