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
Table 22.2
Recent randomized trials for neoadjuvant and adjuvant chemotherapy
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