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524 Chapter 10: Graft Manipulation<br />

phosphatase reagent. Next, the slides were placed in three washes of BioTek red<br />

chromagen reagent, rinsed thoroughly in PBS, <strong>and</strong> counterstained in hematoxylin.<br />

All ICC reagents are manufactured by Ventana/BioTek Systems. Alternatively,<br />

some ICC experiments were performed with the CellPro ImmunoCytoChemistry<br />

Staining Kit (CellPro, Bothell, WA) according to manufacturer's instructions. ICC<br />

methods were comparable for tumor detection sensitivity <strong>and</strong> specificity<br />

(unpublished observations). All ICC results were read by three independent<br />

reviewers. Equivocal ICC results were resolved by consultation, restained <strong>and</strong><br />

reexamined, or recorded as unevaluable.<br />

Results from the tumor cell seeding experiments showed that use of the TEC<br />

column resulted in tumor cell enrichment at all seeding levels tested (Table 1).<br />

Even at the lowest tumor cell concentration (1:10 s<br />

), the TEC system was able to<br />

enrich tumor cells in each experiment. Further, enriched tumor cells were capable<br />

of sustained growth in vitro (data not shown). ICC staining revealed intact tumor<br />

cells, with no interference with anti-cytokeratin immunoreactivity.<br />

A total of 139 <strong>marrow</strong> <strong>and</strong> PBSC patient specimens were analyzed. Twenty-one<br />

specimens were unevaluable due to invalid TEC runs or equivocal ICC staining<br />

results. Data are summarized in Tables 2-5.<br />

In five cases, tumor cells were detected by ICC pre-TEC, but no tumor cells<br />

were detected post-TEC (Table 3). These data suggest that in one of the samples<br />

(#193) the TEC capture antibody did not bind to the patient's tumor cells. In the<br />

Table 1. Mean log enrichment of breast cancer cell-seeded samples<br />

Seed level 1:10 s<br />

Sample type<br />

1:10 s<br />

1:10 s<br />

1:10 7<br />

Bone <strong>marrow</strong> 2.80 ±0.12 2.65 ±0.15 2.27 ±0.12 ND ND<br />

PBSC<br />

(«=3)<br />

2.45 ± 0.0<br />

(«=2)<br />

RESULTS<br />

Tumor cell seeding experiments<br />

Patient specimens<br />

(n=3)<br />

2.48 ± 0.48<br />

(n=22)<br />

(«=3)<br />

2.49 ± 0.37<br />

(n=20)<br />

2.32 ± 0.35<br />

(n=27)<br />

1:10 s<br />

2.50 ± 0.25<br />

Results of tumor cell-seeding experiments with breast cancer cell line CAMA in normal<br />

donor <strong>marrow</strong> <strong>and</strong> PBSC specimens. Reported values are mean log enrichment for cell-<br />

seeding concentrations ranging from 1:10 s<br />

to 1:10 s<br />

. ND, not done.<br />

(n=6)

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