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autologous blood and marrow transplantation - Blog Science ...

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526 Chapter 10: Graft Manipulation<br />

Table 4. Tumor enrichment results on -/+ specimens<br />

Mean no. tumor cells<br />

Clinical Before TEC After TEC Flow-through Fold Log<br />

stage (n) (/2.25X10 6<br />

) (/lXlCf^^XlO 6<br />

) (/2.25X10 6<br />

) enrichment enrichment<br />

II (12) 0 9.2(1-35) 2.6 (0-15) >81.6 >1.8<br />

(9.8-262) (0.99-2.42)<br />

HI (1) 0 21 (NA) 4(NA) >159 (NA) >2.2 (NA)<br />

IV (4) 0 79 (1-308) 1.5 (0-6) >60.1 >0.9<br />

(0.5-122) (0.3-2.09)<br />

Tumor enrichment results on patients who had no tumor cells detected before TEC but had<br />

tumor cells detected after TEC.<br />

DISCUSSION<br />

The experiments with both tumor cell seeded <strong>and</strong> patient <strong>marrow</strong> <strong>and</strong> PBSC<br />

specimens showed that the TEC system is effective in enriching tumor cells for<br />

subsequent ICC analysis. Even at tumor cell concentrations as low as 1:10 s<br />

, tumor<br />

cells were captured <strong>and</strong> released for subsequent ICC analysis. Thus, tumor<br />

detection with TEC is capable of superior detection sensitivity that surpasses the<br />

most sensitive PCR assays. 319<br />

Further, as the cells are intact <strong>and</strong> viable, subsequent<br />

morphologic or functional analyses are not impaired.<br />

Seventeen specimens converted from tumor-negative to tumor-positive after<br />

TEC enrichment, <strong>and</strong> 19 tumor-positive specimens showed considerable<br />

enrichment of tumor cells for subsequent ICC analysis. This will likely result in<br />

more sensitive ICC assays for occult tumor detection. However, in certain cases<br />

(e.g.,

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