Table 2 XI-006 IC50 values of the sarcoma cell line cohort.

From: XI-006 induces potent p53-independent apoptosis in Ewing sarcoma

Cell line

Histology

TP53 status

MDM4 mRNA expression

XI-006 IC50 (nM, 24 hr)

XI-006 IC50 (nM, 48 hr)

STA-ET-1

ES

Wild-type

1.68 ± 0.03

376.3 ± 26.9

98.9 ± 19.5

TC252

ES

Wild-type

2.74 ± 0.04

390.2 ± 106.6

115.6 ± 6.6

SK-N-MC

ES

Truncation

0.61 ± 0.00

472.3 ± 176.4

121.8 ± 31.7

SK-ES-1

ES

Cys176Phe

0.70 ± 0.01

442.4 ± 57.5

236.0 ± 15.0

RD-ES

ES

Arg273Cys

0.32 ± 0.00

638.9 ± 142.4

299.7 ± 68.5

TC71

ES

Truncation

0.40 ± 0.02

567.9 ± 150.8

396.1 ± 78.8

WE-68

ES

Wild-type

1.09 ± 0.04

2089.3 ± 20.4

1475.7 ± 222.6

VH-64

ES

Wild-type

1.07 ± 0.01

2456.4 ± 315.1

1613.1 ± 274.4

Saos-2

OS

Null

0.17 ± 0.00

3600.2 ± 525.7

2143.0 ± 34.9

SJSA

OS

Wild-type

0.15 ± 0.01

6257.1 ± 366.5

3690.5 ± 270.2

U20S

OS

Wild-type

1.94 ± 0.04

>10 000

5416.8 ± 255.7

IMR90

LFB

Wild-type

8348.0 ± 231.0

6802.1 ± 696.5

  1. ES: Ewing sarcoma, OS: Osteosarcoma, LFB: Lung fibroblast
  2. IC50: Concentration of XI-006 required to induce 50% apoptosis (mean ± STDEV from two independent experiments).
  3. MDM4 mRNA expression determined through real-time qPCR analysis (mean ± SE from triplicate reactions).