Adjuvant and Neoadjuvant Treatment: Standard Treatment and Clinical Trials in the East

 

NAC

Postop adjuvant

Primary lesion

Expecting shrinkage

Resected
 
Delayed resection

Early resection
 
Minimal spillage

Spillage of tumor cells

Micrometastasis

Early treatment

Delayed treatment
 
Less influence by surgery

Growth stimulation by surgery?

Macroscopic metastasis

M1 possible

Only micrometastasis

Tumor burden

Large tumor burden

Minimum tumor burden

Drug delivery

Better

Reduced

Judgment of efficacy

Always evaluable

Impossible

Selection of pts

Less information

Maximum information

Compliance of CTX

High

Low

Influence to surgery

Growth during CTX

No influence
 
Toxicity may cancel surgery
  
Toxicity may delay surgery
  
Potential increase of morbidity
  
Potential increase of mortality
 




3.

Is there any role of radiation therapy added to chemotherapy after D2 surgery?

The update analysis of INT0116 study showed that chemoradiotherapy in this trial reduced mainly local regional recurrence but not systemic recurrence. These data support the finding that this treatment is effective after D0/1 surgery but not after D2 surgery [16]. After the results of INT0116 study were published, a Korean group performed a phase III study to compare adjuvant chemoradiation with surgery with chemotherapy (XELOX) alone (ARTIST trial) [17]. Although there was a subgroup in which borderline benefit of this treatment was suggested, primary endpoints did not meet [17]. Chemoradiation after D2 surgery was not accepted as efficient adjuvant treatment for gastric cancer but there remains a question about role of radiation therapy after D2 surgery in advanced stage.

 



Ongoing Phase III Clinical Trials in Asia to Solve these Questions (Table 22.2)




1.

Comparing two adjuvant chemotherapy after D2 surgery



a.

S-1 + oxaliplatin (SOX) versus S-1 (POTENT study)

 

b.

Capecitabine + oxaliplatin (XELOX) versus XELOX + docetaxel

 

c.

S-1 versus S-1 + docetaxel

 

 

2.

Evaluation of additional effect of NAC



a.

NAC by docetaxel + SOX followed by adjuvant S-1 after D2 surgery versus S-1 adjuvant after D2 surgery

 

b.

NAC by SOX followed by SOX after D2 versus SOX after D2

 

c.

NAC by SOX followed by SOX after D2 followed by S-1 versus SOX after D2 versus XELOX after D2

 

d.

NAC by XELOX followed by XELOX after D2 versus XELOX after D2

 

 

3.

Role of radiation therapy added to adjuvant chemotherapy



a.

Surgery + S-1 versus surgery + SOX versus surgery + SOX + radiation (ARTIST II trial)

 

b.

NAC by XELOX + surgery followed by XELOX with or without concurrent preoperative radiotherapy

 

c.

Surgery + XELOX with radiation versus XELOX

 

 

Jun 28, 2016 | Posted by in GASTOINESTINAL SURGERY | Comments Off on Adjuvant and Neoadjuvant Treatment: Standard Treatment and Clinical Trials in the East

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