Презентация на тему Gastric cancer

and histologic subtypes associated with a variety of known

and unknown environmental and genetic factors.
It is a global public health concern, accounting for 700,000 annual deaths worldwide, and currently ranks as the fourth leading cause of cancer mortality, with a 5-year survival of only 20%.
The incidence and prevalence of gastric cancer vary widely, with Asian/Pacific regions bearing the highest rates of disease.

associated with a hereditary predisposition, including a variety of

Mendelian genetic conditions and complex genetic traits.

to Lauren’s1 classification published in 1965 and revised by

Carneiro et al.2 in 1995.
The four histologic categories include:
(1) glandular/intestinal,
(2) border foveal hyperplasia,
(3) mixed intestinal/diffuse, and
(4) solid/undifferentiated.

can be subdivided into intestinal type or diffuse type.

Diffuse gastric tumors frequently feature signet ring cells
The intestinal subtype is seen more commonly in older patients, whereas the diffuse type affects younger patients and has a more aggressive clinical course.

diet and lifestyle variables.

Infectious Risk Factors

H. pylori infection
Epstein-Barr virus
Genetics

countries, and men have roughly twice the risk of

women.
In 2008, estimates of gastric cancer burden in the United States were 21,500 cases (13,190 men and 8,310 women) and 10,880 deaths. The median age at diagnosis for gastric cancer is 71 years, and 5-year survival is approximately 25%.
Only 24% of stomach cancers are localized at the time of diagnosis, 30% have lymph node involvement, and another 30% have metastatic disease. Survival rates are predictably higher for those with localized disease, with corresponding 5-year survival rates of 60%.

gastric cancers are adenocarcinomas.

spread by local extension to involve adjacent structures and

can develop lymphatic metastases, peritoneal metastases, and distant metastases.
These extensions can occur by the local invasive properties of the tumor, lymphatic spread, or hematogenous dissemination.

vague, nonspecific symptoms that characterize gastric cancer, many patients

are diagnosed with advanced-stage disease.
Patients may have a combination of signs and symptoms such as weight loss (22% to 61%)37; anorexia (5% to 40%); fatigue, epigastric discomfort, or pain (62% to 91%); and postprandial fullness, heart burn, indigestion, nausea, and vomiting (6% to 40%). None of these unequivocally indicates gastric cancer. In addition, patients may be asymptomatic (4% to 17%). Weight loss and abdominal pain are the most common presenting symptoms at initial encounter. Weight loss is a common symptom, and its clinical significance should not be underestimated.
Dewys et al. found that in 179 patients with advanced gastric cancer, >80% of patients had a >10% decrease in body weight before diagnosis. Furthermore, patients with weight loss had a significantly shorter survival than did those without weight loss

of peptic ulcer disease. A history of dysphagia or

pseudoachalasia may indicate the presence of a tumor in the cardia with extension through the gastroesophageal junction. Early satiety is an infrequent symptom of gastric cancer but is indicative of a diffusely infiltrative tumor that has resulted in loss of distensibility of the gastric wall.
Delayed satiety and vomiting may indicate pyloric involvement. Significant gastrointestinal bleeding is uncommon with gastric cancer; however, hematemesis does occur in approximately 10% to 15% of patients, and anemia in 1% to 12% of patients. Signs and symptoms at presentation are often related to spread of disease.

Ascites, jaundice, or a palpable mass indicate incurable disease. The transverse colon is a potential site of malignant fistulization and obstruction from a gastric primary tumor. Diffuse peritoneal spread of disease frequently produces other sites of intestinal obstruction.

A large ovarian mass (Krukenberg’s tumor) or a large peritoneal implant in the pelvis (Blumer’s shelf), which can produce symptoms of rectal obstruction, may be palpable on pelvic or rectal examination.

Nodular metastases in the subcutaneous tissue around the umbilicus (Sister Mary Joseph’s node) or in peripheral lymph nodes such as in the supraclavicular area (Virchow’s node) or axillary region (Irish’s node) represent areas in which a tissue diagnosis can be established with minimal morbidity. There is no symptom complex that occurs early in the evolution of gastric cancer that can identify individuals for further diagnostic measures. However, alarming symptoms (dysphagia, weight loss, and palpable abdominal mass) are independently associated with survival;

increased number and the specific symptom is associated with mortality.

and Peritoneal Cytology

Gastric Cancer)
Endoscopic Mucosal Resection
Limited Surgical Resection
Gastrectomy

treatment following a potential curative resection of the primary

tumor and regional lymph nodes.
Therapy after resections that leave microscopic or gross disease are not adjuvant treatment, but rather therapy for known disease, which is palliative in nature.
Neoadjuvant chemotherapy involves the use of systemic treatment before potentially curative surgery.

therapy soon after operation (perioperative chemotherapy). Studies have shown

a rapid increase in cell growth of metastases after a primary tumor has been removed related to a decline in certain circulating factors, which serve to inhibit angiogenesis or other cell-cycle promotors, once the primary tumor is removed.
Perioperative or neoadjuvant chemotherapy has been studied because the ability to perform a R0 resection in gastric cancer is difficult. In addition, a substantial number of patients undergoing gastrectomy have prolonged recovery.

higher rate of R0 resections and treatment of micrometastatic

disease early in the course of treatment.

Studies demonstrating benefit of preoperative chemotherapy over surgery alone1

Evidence of role of induction chemoradiation therapy in distal esophageal CA2

1MAGIC Trial. Cunningham et al. Radiother Oncol 104 (2012)
2CROSS Trial. van Hagen et al. NEJM (2012)

of predicting nodal involvement is 60-80%
Surgery alone may be

sufficient for Stage II disease
Neoadjuvant therapy may be overtreating some patients

Gastric Cancer
Pathologic staging may result in more appropriate

choice of adjuvant therapy (accurate stage II vs III, D1 vs D2, margins).
Symptomatic patients may require initial surgery.
In reality, gastrectomy is often performed before MDT consultation.

Jan 2012
Samsung University
458 patient RCT
D2 gastrectomy
~5% proximal CA

Postoperative adjuvant

Cap-Cis ± RT

No difference in DFS
No difference in locoregional rec

D2 gastrectomy
~10% GE junction

Postoperative adjuvant 5FU-LV ± IMRT

Improved RFS

with IMRT (50 vs 32 mo)
No difference in OS

Zhu et al. Radiother Oncol 104 (2012)

Gastric Cancer Group Trial
Dikken et al. JCO May 2010

Surgery Alone for Gastric and GEJ Adenocarcinoma
20% GE Junction
Criticized

for inadequate surgical radicality

wks
D1+ Surgery
D1+ Surgery
3x ECC q 3 wks
Chemoradiotherapy

45 Gy/25 fx
+

capecitabine
+ cisplatin

R

Within 4-12 weeks

3-6 weeks

2 weeks

CRITICS Study

may be preferred in most cases, initial gastrectomy is

being commonly performed.
While R0 gastrectomy with D2 lymphadenectomy is recommended, less radical surgery is common.
Chemoradiation appears to have a role in reducing local recurrence.
Postoperative chemoradiation should be considered when managing a post-op patient, particularly when