| Id |
Subject |
Object |
Predicate |
Lexical cue |
| T1 |
0-115 |
DRI_Background |
denotes |
Non-enzymatic, serum-free tissue culture of pre-invasive breast lesions for spontaneous generation of mammospheres. |
| T2 |
116-311 |
DRI_Background |
denotes |
Breast ductal carcinoma in situ (DCIS), by definition, is proliferation of neoplastic epithelial cells within the confines of the breast duct, without breaching the collagenous basement membrane. |
| T3 |
312-488 |
DRI_Background |
denotes |
While DCIS is a non-obligate precursor to invasive breast cancers, the molecular mechanisms and cell populations that permit progression to invasive cancer are not fully known. |
| T4 |
489-730 |
DRI_Challenge |
denotes |
To determine if progenitor cells capable of invasion existed within the DCIS cell population, we developed a methodology for collecting and culturing sterile human breast tissue at the time of surgery, without enzymatic disruption of tissue. |
| T5 |
731-874 |
DRI_Background |
denotes |
Sterile breast tissue containing ductal segments is harvested from surgically excised breast tissue following routine pathological examination. |
| T6 |
875-1017 |
DRI_Background |
denotes |
Tissue containing DCIS is placed in nutrient rich, antibiotic-containing, serum free medium, and transported to the tissue culture laboratory. |
| T7 |
1018-1088 |
DRI_Approach |
denotes |
The breast tissue is further dissected to isolate the calcified areas. |
| T8 |
1089-1258 |
DRI_Background |
denotes |
Multiple breast tissue pieces (organoids) are placed in a minimal volume of serum free medium in a flask with a removable lid and cultured in a humidified CO₂ incubator. |
| T9 |
1259-1346 |
DRI_Background |
denotes |
Epithelial and fibroblast cell populations emerge from the organoid after 10 - 14 days. |
| T10 |
1347-1423 |
DRI_Background |
denotes |
Mammospheres spontaneously form on and around the epithelial cell monolayer. |
| T11 |
1424-1528 |
DRI_Approach |
denotes |
Specific cell populations can be harvested directly from the flask without disrupting neighboring cells. |
| T12 |
1529-1668 |
DRI_Outcome |
denotes |
Our non-enzymatic tissue culture system reliably reveals cytogenetically abnormal, invasive progenitor cells from fresh human DCIS lesions. |