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MALIGNANT NEOPLASMS OF
     THE STOMACH
      PROF.MINOCHA
Primary
 Common Primary
• Adenocarcinoma (95%),
• Lymphoma (4%),
• Malignant GIST (1%)
 Rare Primary
• Carcinoid, Angiosarcoma, Carcinosarcoma,
  and Squamous cell carcinoma
Secondary
 From :
 Melanoma , Breast(Blood born)

 Colon or Pancreas (Direct ext.)

 Ovary (By peritoneal seeding )
EPIDEMIOLOGY
• Generally-- Disease of the elderly
• Lower socioeconomic status
• Blacks 2 times > whites
  Younger patients-- more of the diffuse variety
• Large
• Aggressive,
• Poorly differentiated,
• Sometimes infiltrating the entire stomach
   (linitis plastic)
ETIOLOGY

  Common in
- Pernicious anemia
- Blood group A
 -A family history of gastric cancer
- Environmental factors appear more related
  to the intestinal form
Factors Increasing or Decreasing the
         Risk of Gastric Cancer
Increase risk                          Decrease risk
• Family history                       • Aspirin
• Diet (high in nitrates, salt, fat)   • Diet (high fresh fruit and
• Familial polyposis                      vegetable intake)
• Gastric adenomas                     • Vitamin C
• Hereditary nonpolyposis
   colorectal cancer
• Helicobacter pylori infection
•    Atrophic gastritis, intestinal
   metaplasia, dysplasia
• Previous gastrectomy or
   gastrojejunostomy (>10 y ago)
• Tobacco use
• Ménétrier's disease
Premalignant Conditions
PATHOLOGY
Dysplasia
- Universal precursor
- Gastric resection - widespread /multifocal
- EMR - localized

 Mild dysplasia - endoscopic
biopsy/surveillance, and Helicobacter
eradication
Early Gastric Cancer
Mucosa and submucosa, regardless of lymph
node status

• 10% have lymph node metastases
 70% well differentiated
 30% poorly differentiated

 Cure rate with adequate gastric resection and
 lymphadenectomy - 95%
Types/SubTypes(Early Gastric Cancer)

• Type I Exophytic lesion extending into the gastric lumen
• Type II Superficial variant
   IIA Elevated lesions with a height no more than the
  thickness of the adjacent mucosa
   IIB Flat lesions
   IIC Depressed lesions with an eroded but not deeply
  ulcerated appearance
• Type III Excavated lesions that may extend into the
  muscularis propria without invasion of this layer by actual
  cancer cells
Pathologic types of early gastric cancer
Japanese classification of early gastric
               cancer
Advanced gastric cancer
Involves the muscularis

Macroscopically classified by Bormann into
 four types

Types III and IV are commonly incurable
Gross Morphology and Histologic
             Subtypes
 Four Gross forms :
• Polypoid

• Fungating

• Ulcerative

• Scirrhous
Borrmann classification of advanced
          gastric cancer
First two, tumor mass is intraluminal---
• Polypoid tumors are not ulcerated
• Fungating tumors are elevated intraluminally,
   but also ulcerated
 Latter two , tumor mass is in the wall of the
   stomach---
• Ulcerative tumors are self-descriptive;
• Scirrhous infiltrate the entire thickness of the
   stomach (linitis plastica) poor prognosis, involve
   entire stomach
Important Prognostic Indicators
• Lymph node involvement

• Depth of tumor invasion

• Tumor grade (degree of differentiation: well,
  moderately, poorly)
Histologic Classifications
Lauren classification

•        Intestinal type (53%),
•        Diffuse type (33%),
•        Unclassified (14%).
    The Intestinal type associated with
    chronic atrophic gastritis, severe intestinal
     metaplasia, and dysplasia, less aggressive than the
     diffuse type
    The Diffuse type of gastric cancer associated with
    younger patients and proximal tumors, poorly
     differentiated
Ming classification

• Expanding (67%)



• Infiltrative (33%)
World Health Organization Histologic
                  Typing
•   Adenocarcinoma
•   Papillary adenocarcinoma
•    Tubular adenocarcinoma
•    Mucinous adenocarcinoma
•   ---------------------------------------
•    Signet-ring cell carcinoma
•   Adenosquamous carcinoma
•   Squamous cell carcinoma
•   Small cell carcinoma
•   ---------------------------------------
•   Undifferentiated carcinoma
•   Others
                            The Japanese classification(more detailed)
Spread
  Various modes

 Distant spread unusual before the disease
 spreads locally

 Distant metastases uncommon in the
 absence of lymph node metastases
Direct spread

Muscularis



  Serosa

             Adjacent organs
           Pancreas, Colon and Liver
Lymphatic spread


1- Permeation

2- Emboli

Supraclavicular nodes (Troisier’s sign).

Nodal involvement does not imply systemic
dissemination
Blood-Borne
     Liver



 Other organs including lung and bone



Uncommon in the absence of nodal disease
Transperitoneal
 Indicates Incurability
 - Ascites
- Advanced palpated either abdominally or
 rectally as a tumour ‘shelf ’
 - Ovaries (Krukenberg’s tumours)
- Umbilicus (Sister Joseph’s nodule)

Laparoscopy and cytology
TNM Staging (AJCC &IUCC)

• T: Primary tumor
• Tis Carcinoma in situ; intraepithelial tumor without
  invasion of lamina propria
• T1 Tumor invades lamina propria or submucosa
• T2 Tumor invades muscularis propria or subserosa
• T3 Tumor penetrates serosa (visceral peritoneum)
  without invasion of adjacent structures
• T4 Tumor invades adjacent structures
N: Regional lymph node

N0 No regional lymph node metastasis
N1 Metastasis in 1 to 6 regional lymph nodes
N2 Metastasis in 7 to 15 lymph nodes
N3 Metastasis in more than 15 regional lymph
nodes
M: Distant metastasis

• M0 No distant metastasis

• M1 Distant metastasis
Staging

------IA   T1 N0 M0
------IB   T1 N1 M0
           T2 N0 M0
                            ------II      T1 N2 M0
                                          T2 N1 M0
                                          T3 N0 M0
------IIIA T2 N2 M0
           T3 N1 M0
           T4 N0 M0
------- IIIB T3 N2 M0
                            --------IV    T4 N1–3 M0
                                           T1–3 N3 M0
                                         Any T Any N M1
CLINICAL MANIFESTATIONS

 - Weight loss
 - Anorexia / early satiety
  - Abdominal pain
  - Nausea, vomiting, bloating
 - Acute GI bleeding (5%)
 - Chronic occult blood loss is common ( iron
  deficiency anemia and heme-positive stool)
- Dysphagia (cardia)
Paraneoplastic syndromes
 Rare

Trousseau's syndrome (thrombophlebitis)

Acanthosis nigricans (hyperpigmentation of
the axilla and groin)

Peripheral neuropathy
Physical examination
Focused examination :

Neck

Chest

Abdomen

Rectum and pelvis
• Cervical
• supraclavicular (on the left referred to as
  Virchow's node)
• axillary lymph nodes may be enlarged



                    FNAC
- Metastatic pleural effusion
- Aspiration pneumonitis
- An abdominal mass indicate a large primary
   tumor
 - Liver metastases
 - Carcinomatosis - Krukenberg's tumor
 - Palpable umbilical nodule (Sister Joseph's
   nodule) malignant ascites
Rectal exam

• Heme-positive stool
• Hard nodularity extraluminally and
  anteriorly




 Drop metastases, or rectal shelf of Blumer in
  the pouch of Douglas
DIAGNOSTIC EVALUATION

 Peptic ulcer / Gastric cancer clinical grounds
  impossible
• age 45 years             Endoscopy and biopsy
• new onset dyspepsia
• alarm symptoms           Double-contrast barium
• family history
Preoperative staging
• Abdominal/Pelvic CT scanning ( contrast)
• MRI
• Locally EUS - enlarged (>5 mm) perigastric and
  celiac lymph nodes
• EUS- early gastric cancer (T1) from more
  advanced tumors
• Positron Emission Tomography Scanning(+CT)
• Staging Laparoscopy and Peritoneal Cytology
TREATMENT
• Surgical resection    Curative treatment




  Exceptions:

• cannot tolerate operation
• overwhelming metastatic disease
Goal
• R0 resection / adequate lymphadenectomy

• Negative margin of at least 5 cm required

• In diffuse variety, beyond 5 cm desirable

• Frozen section confirmation
Gastrectomy

Curative - Primary tumor resected en bloc
with adjacent involved organs (distal
pancreas, transverse colon, or spleen)



 Palliative - indicated in incurable disease
Subtotal gastric resection

 - ligation of the left and right gastric and
  gastroepiploic arteries at origin
 - en bloc removal of the distal 75% of the stomach, 2
  cm of duodenum
  - the greater and lesser omentum, associated
  lymphatic tissue
• Reconstruction - Billroth II gastrojejunostomy
• the spleen and pancreatic tail not removed In
  absence of involvement
• operative mortality - 2 to 5%
Total gastrectomy

• with Roux-en-Y esophagojejunostomy in
  proximal gastric adenocarcinoma



• Total gastrectomy - superior functional, not
  oncologic, results for proximal gastric cancer
Extent of Lymphadenectomy

• The Japanese Research Society for Gastric Cancer
   numbered the lymph node stations that potentially
   drain the stomach
  Generally these are grouped into
• level D1 ( stations 3 to 6),
• level D2 ( stations 1, 2, 7, 8, and 11) &
• level D3 ( stations 9, 10, and 12) nodes
 D1 nodes are perigastric
 D2 nodes are along the hepatic and splenic arteries
 D3 nodes are the most distant
The standard operation for gastric cancer is




the D2 gastrectomy, which involves a more
extensive lymphadenectomy (removal of the
D1 and D2 nodes)
Other treatment modalities
           Radiotherapy

Role is controversial

Number of radiosensitive tissues in the
region of the gastric bed - limits the dose

Role in the palliative treatment of painful
bony metastases
Chemotherapy

   Improves the outcome
   Should have chemotherapy before surgery
Number of regimes / currently used
  Epirubicin,
  Cis-platinum &
  infusional 5-Fluorouracil (5-FU) or an oral
 analogue such as Capecitabine
• First line in inoperable disease

• Oxaliplatin substituted for Cis-platinum (
  fewer side-effects)

• Second-line treatment combinations
  including Taxotere ↑

• Chemotherapy in advanced disease is
  palliative

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Carcinoma of Stomach

  • 1. MALIGNANT NEOPLASMS OF THE STOMACH PROF.MINOCHA
  • 2. Primary Common Primary • Adenocarcinoma (95%), • Lymphoma (4%), • Malignant GIST (1%) Rare Primary • Carcinoid, Angiosarcoma, Carcinosarcoma, and Squamous cell carcinoma
  • 3. Secondary From :  Melanoma , Breast(Blood born)  Colon or Pancreas (Direct ext.)  Ovary (By peritoneal seeding )
  • 4.
  • 5.
  • 6. EPIDEMIOLOGY • Generally-- Disease of the elderly • Lower socioeconomic status • Blacks 2 times > whites Younger patients-- more of the diffuse variety • Large • Aggressive, • Poorly differentiated, • Sometimes infiltrating the entire stomach (linitis plastic)
  • 7. ETIOLOGY Common in - Pernicious anemia - Blood group A -A family history of gastric cancer - Environmental factors appear more related to the intestinal form
  • 8. Factors Increasing or Decreasing the Risk of Gastric Cancer Increase risk Decrease risk • Family history • Aspirin • Diet (high in nitrates, salt, fat) • Diet (high fresh fruit and • Familial polyposis vegetable intake) • Gastric adenomas • Vitamin C • Hereditary nonpolyposis colorectal cancer • Helicobacter pylori infection • Atrophic gastritis, intestinal metaplasia, dysplasia • Previous gastrectomy or gastrojejunostomy (>10 y ago) • Tobacco use • Ménétrier's disease
  • 10. PATHOLOGY Dysplasia - Universal precursor - Gastric resection - widespread /multifocal - EMR - localized Mild dysplasia - endoscopic biopsy/surveillance, and Helicobacter eradication
  • 11. Early Gastric Cancer Mucosa and submucosa, regardless of lymph node status • 10% have lymph node metastases  70% well differentiated  30% poorly differentiated Cure rate with adequate gastric resection and lymphadenectomy - 95%
  • 12. Types/SubTypes(Early Gastric Cancer) • Type I Exophytic lesion extending into the gastric lumen • Type II Superficial variant IIA Elevated lesions with a height no more than the thickness of the adjacent mucosa IIB Flat lesions IIC Depressed lesions with an eroded but not deeply ulcerated appearance • Type III Excavated lesions that may extend into the muscularis propria without invasion of this layer by actual cancer cells
  • 13. Pathologic types of early gastric cancer
  • 14. Japanese classification of early gastric cancer
  • 15. Advanced gastric cancer Involves the muscularis Macroscopically classified by Bormann into four types Types III and IV are commonly incurable
  • 16. Gross Morphology and Histologic Subtypes Four Gross forms : • Polypoid • Fungating • Ulcerative • Scirrhous
  • 17. Borrmann classification of advanced gastric cancer
  • 18. First two, tumor mass is intraluminal--- • Polypoid tumors are not ulcerated • Fungating tumors are elevated intraluminally, but also ulcerated Latter two , tumor mass is in the wall of the stomach--- • Ulcerative tumors are self-descriptive; • Scirrhous infiltrate the entire thickness of the stomach (linitis plastica) poor prognosis, involve entire stomach
  • 19. Important Prognostic Indicators • Lymph node involvement • Depth of tumor invasion • Tumor grade (degree of differentiation: well, moderately, poorly)
  • 21. Lauren classification • Intestinal type (53%), • Diffuse type (33%), • Unclassified (14%). The Intestinal type associated with chronic atrophic gastritis, severe intestinal metaplasia, and dysplasia, less aggressive than the diffuse type The Diffuse type of gastric cancer associated with younger patients and proximal tumors, poorly differentiated
  • 22. Ming classification • Expanding (67%) • Infiltrative (33%)
  • 23. World Health Organization Histologic Typing • Adenocarcinoma • Papillary adenocarcinoma • Tubular adenocarcinoma • Mucinous adenocarcinoma • --------------------------------------- • Signet-ring cell carcinoma • Adenosquamous carcinoma • Squamous cell carcinoma • Small cell carcinoma • --------------------------------------- • Undifferentiated carcinoma • Others The Japanese classification(more detailed)
  • 24. Spread Various modes  Distant spread unusual before the disease spreads locally  Distant metastases uncommon in the absence of lymph node metastases
  • 25. Direct spread Muscularis Serosa Adjacent organs Pancreas, Colon and Liver
  • 26. Lymphatic spread 1- Permeation 2- Emboli Supraclavicular nodes (Troisier’s sign). Nodal involvement does not imply systemic dissemination
  • 27. Blood-Borne Liver Other organs including lung and bone Uncommon in the absence of nodal disease
  • 28. Transperitoneal Indicates Incurability - Ascites - Advanced palpated either abdominally or rectally as a tumour ‘shelf ’ - Ovaries (Krukenberg’s tumours) - Umbilicus (Sister Joseph’s nodule) Laparoscopy and cytology
  • 29. TNM Staging (AJCC &IUCC) • T: Primary tumor • Tis Carcinoma in situ; intraepithelial tumor without invasion of lamina propria • T1 Tumor invades lamina propria or submucosa • T2 Tumor invades muscularis propria or subserosa • T3 Tumor penetrates serosa (visceral peritoneum) without invasion of adjacent structures • T4 Tumor invades adjacent structures
  • 30. N: Regional lymph node N0 No regional lymph node metastasis N1 Metastasis in 1 to 6 regional lymph nodes N2 Metastasis in 7 to 15 lymph nodes N3 Metastasis in more than 15 regional lymph nodes
  • 31. M: Distant metastasis • M0 No distant metastasis • M1 Distant metastasis
  • 32. Staging ------IA T1 N0 M0 ------IB T1 N1 M0 T2 N0 M0 ------II T1 N2 M0 T2 N1 M0 T3 N0 M0 ------IIIA T2 N2 M0 T3 N1 M0 T4 N0 M0 ------- IIIB T3 N2 M0 --------IV T4 N1–3 M0 T1–3 N3 M0 Any T Any N M1
  • 33. CLINICAL MANIFESTATIONS - Weight loss - Anorexia / early satiety - Abdominal pain - Nausea, vomiting, bloating - Acute GI bleeding (5%) - Chronic occult blood loss is common ( iron deficiency anemia and heme-positive stool) - Dysphagia (cardia)
  • 34. Paraneoplastic syndromes Rare Trousseau's syndrome (thrombophlebitis) Acanthosis nigricans (hyperpigmentation of the axilla and groin) Peripheral neuropathy
  • 35. Physical examination Focused examination : Neck Chest Abdomen Rectum and pelvis
  • 36. • Cervical • supraclavicular (on the left referred to as Virchow's node) • axillary lymph nodes may be enlarged FNAC
  • 37. - Metastatic pleural effusion - Aspiration pneumonitis - An abdominal mass indicate a large primary tumor - Liver metastases - Carcinomatosis - Krukenberg's tumor - Palpable umbilical nodule (Sister Joseph's nodule) malignant ascites
  • 38. Rectal exam • Heme-positive stool • Hard nodularity extraluminally and anteriorly Drop metastases, or rectal shelf of Blumer in the pouch of Douglas
  • 39. DIAGNOSTIC EVALUATION Peptic ulcer / Gastric cancer clinical grounds impossible • age 45 years Endoscopy and biopsy • new onset dyspepsia • alarm symptoms Double-contrast barium • family history
  • 40. Preoperative staging • Abdominal/Pelvic CT scanning ( contrast) • MRI • Locally EUS - enlarged (>5 mm) perigastric and celiac lymph nodes • EUS- early gastric cancer (T1) from more advanced tumors • Positron Emission Tomography Scanning(+CT) • Staging Laparoscopy and Peritoneal Cytology
  • 41. TREATMENT • Surgical resection Curative treatment Exceptions: • cannot tolerate operation • overwhelming metastatic disease
  • 42. Goal • R0 resection / adequate lymphadenectomy • Negative margin of at least 5 cm required • In diffuse variety, beyond 5 cm desirable • Frozen section confirmation
  • 43. Gastrectomy Curative - Primary tumor resected en bloc with adjacent involved organs (distal pancreas, transverse colon, or spleen) Palliative - indicated in incurable disease
  • 44. Subtotal gastric resection - ligation of the left and right gastric and gastroepiploic arteries at origin - en bloc removal of the distal 75% of the stomach, 2 cm of duodenum - the greater and lesser omentum, associated lymphatic tissue • Reconstruction - Billroth II gastrojejunostomy • the spleen and pancreatic tail not removed In absence of involvement • operative mortality - 2 to 5%
  • 45.
  • 46.
  • 47. Total gastrectomy • with Roux-en-Y esophagojejunostomy in proximal gastric adenocarcinoma • Total gastrectomy - superior functional, not oncologic, results for proximal gastric cancer
  • 48.
  • 49. Extent of Lymphadenectomy • The Japanese Research Society for Gastric Cancer numbered the lymph node stations that potentially drain the stomach Generally these are grouped into • level D1 ( stations 3 to 6), • level D2 ( stations 1, 2, 7, 8, and 11) & • level D3 ( stations 9, 10, and 12) nodes  D1 nodes are perigastric  D2 nodes are along the hepatic and splenic arteries  D3 nodes are the most distant
  • 50. The standard operation for gastric cancer is the D2 gastrectomy, which involves a more extensive lymphadenectomy (removal of the D1 and D2 nodes)
  • 51. Other treatment modalities Radiotherapy Role is controversial Number of radiosensitive tissues in the region of the gastric bed - limits the dose Role in the palliative treatment of painful bony metastases
  • 52. Chemotherapy Improves the outcome Should have chemotherapy before surgery Number of regimes / currently used Epirubicin, Cis-platinum & infusional 5-Fluorouracil (5-FU) or an oral analogue such as Capecitabine
  • 53. • First line in inoperable disease • Oxaliplatin substituted for Cis-platinum ( fewer side-effects) • Second-line treatment combinations including Taxotere ↑ • Chemotherapy in advanced disease is palliative