Table 1. Effect of PADI4 knockdown on tumor-initiating ability of breast cancer cell lines in vivo.
Cells were orthotopically implanted in nude mice at the specified cell inocula, and tumor formation was assessed at day 60. Cancer stem cell frequency was calculated from tumor incidence rates using ELDA software.
| Tumor incidence at different cell inocula | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Model | Cell inoculum | 2.5×10^5 | 5×10^4 | 1×10^4 | 1×10^3 | 1/stem cell frequency | Confidence interval | Relative stem cell frequency | Chi2 p-value |
| MCF10Ca1h | Parent | 10/10 | 5/10 | 0/10 | 0/10 | 75410 | 139349-40809 | 1 | |
| shCON | 10/10 | 8/10 | 0/10 | 0/10 | 45474 | 85992-24047 | 1.65 | 0.29 | |
| shPADI4 79 | 10/10 | 10/10 | 3/10 | 0/10 | 18760 | 18760-10053 | 4.02 | 0.00368 | |
| shPADI4 80 | 10/10 | 10/10 | 3/10 | 0/10 | 17575 | 17575-9217 | 4.29 | 0.00263 | |
| Cell inoculum | 2.5×10^5 | 1×10^5 | 1×10^4 | 1×10^3 | 1/stem cell frequency | Confidence interval | Relative stem cell frequency | Chi2 p-value | |
| MCF10Ca1a | Parent | ND | 8/10 | 3/10 | 0/10 | 52177 | 103175-26387 | 1 | |
| shCON | ND | 8/10 | 5/10 | 0/10 | 41253 | 82167-20712 | 1.26 | 0.61 | |
| shPADI4 79 | ND | 8/10 | 5/10 | 0/10 | 8469 | 17493-4101 | 6.16 | 0.000511 | |
| shPADI4 80 | ND | 10/10 | 7/10 | 1/10 | 7366 | 14958-3627 | 7.08 | 0.000128 | |
| Cell inoculum | 2.5×10^5 | 1×10^5 | 1×10^4 | 1×10^3 | 1/stem cell frequency | Confidence interval | Relative stem cell frequency | Chi2 p-value | |
| MCF7E | Parent | ND | 8/10 | 2/10 | 0/10 | 59215 | 117500-29842 | 1 | |
| shCON | ND | 8/10 | 1/10 | 0/10 | 67767 | 135682-33846 | 0.87 | 0.787 | |
| shPADI4 79 | ND | 10/10 | 3/10 | 0/10 | 25058 | 53620-11710 | 2.36 | 0.101 | |
| shPADI4 80 | ND | 10/10 | 4/10 | 2/10 | 20275 | 44941-9148 | 2.92 | 0.0435 | |
| Cell inoculum | 2.5×10^5 | 2×10^5 | 2×10^4 | 2×10^3 | 1/stem cell frequency | Confidence interval | Relative stem cell frequency | Chi2 p-value | |
| MDA-MB-231 LM2 | shCON | ND | 10/10 | 7/10 | 1/10 | 16938 | 34985-8201 | 1 | |
| shPADI4 80 | ND | 10/10 | 10/10 | 6/10 | 2180 | 4957-959 | 7.77 | 0.000265 | |