Linker ID	LIN0XIBCO
Linker Name	Ortho-hydroxy-protected aryl sulfate
Linker Type	Thiol-sensitive linker
Antibody-Linker Relation	Cleavable

Experiment 1 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Tumor Growth Inhibition value (TGI)	≈ 0.00% (Day 78)	High HER2 expression (HER2 +++)
Method Description	We also tested the OHPAS ADCs in in vivo xenograft mouse models using N87 cell lines. The experiment was followed up to 110 days after administration of ADCs at two different doses (0.5 mg/kg) on day one (initial tumor volume 100 mm3).
In Vivo Model	NCI-N87 CDX model
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603
Experiment 2 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Tumor Growth Inhibition value (TGI)	≈ 71.10% (Day 78)	High HER2 expression (HER2 +++)
Method Description	We also tested the OHPAS ADCs in in vivo xenograft mouse models using N87 cell lines. The experiment was followed up to 110 days after administration of ADCs at two different doses (2 mg/kg) on day one (initial tumor volume 100 mm3).
In Vivo Model	NCI-N87 CDX model
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603

Experiment 1 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.03 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Breast adenocarcinoma	SK-BR-3 cells		CVCL_0033
Experiment 2 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.03 nM	Moderate HER2 expression (HER2 ++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Breast ductal carcinoma	JIMT-1 cells		CVCL_2077
Experiment 3 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.04 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Ovarian serous cystadenocarcinoma	SK-OV-3 cells		CVCL_0532
Experiment 4 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.08 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603
Experiment 5 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.58 nM	Negative HER2 expression (HER2 -)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Invasive breast carcinoma	MCF-7 cells		CVCL_0031

Experiment 1 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Tumor Growth Inhibition value (TGI)	≈ 37.00% (Day 78)	High HER2 expression (HER2 +++)
Method Description	We also tested the OHPAS ADCs in in vivo xenograft mouse models using N87 cell lines. The experiment was followed up to 110 days after administration of ADCs at two different doses (0.5 mg/kg) on day one (initial tumor volume 100 mm3).
In Vivo Model	NCI-N87 CDX model
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603
Experiment 2 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Tumor Growth Inhibition value (TGI)	≈ 92.60% (Day 78)	High HER2 expression (HER2 +++)
Method Description	We also tested the OHPAS ADCs in in vivo xenograft mouse models using N87 cell lines. The experiment was followed up to 110 days after administration of ADCs at two different doses (2 mg/kg) on day one (initial tumor volume 100 mm3).
In Vivo Model	NCI-N87 CDX model
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603

Experiment 1 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.02 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Breast adenocarcinoma	SK-BR-3 cells		CVCL_0033
Experiment 2 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.03 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603
Experiment 3 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.05 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Ovarian serous cystadenocarcinoma	SK-OV-3 cells		CVCL_0532
Experiment 4 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.08 nM	Moderate HER2 expression (HER2 ++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Breast ductal carcinoma	JIMT-1 cells		CVCL_2077
Experiment 5 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	> 50.00 nM	Negative HER2 expression (HER2 -)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Invasive breast carcinoma	MCF-7 cells		CVCL_0031

Experiment 1 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Tumor Growth Inhibition value (TGI)	≈ 74.10% (Day 78)	High HER2 expression (HER2 +++)
Method Description	We also tested the OHPAS ADCs in in vivo xenograft mouse models using N87 cell lines. The experiment was followed up to 110 days after administration of ADCs at two different doses (0.5 mg/kg) on day one (initial tumor volume 100 mm3).
In Vivo Model	NCI-N87 CDX model
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603
Experiment 2 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Tumor Growth Inhibition value (TGI)	≈ 98.50% (Day 78)	High HER2 expression (HER2 +++)
Method Description	We also tested the OHPAS ADCs in in vivo xenograft mouse models using N87 cell lines. The experiment was followed up to 110 days after administration of ADCs at two different doses (2 mg/kg) on day one (initial tumor volume 100 mm3).
In Vivo Model	NCI-N87 CDX model
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603

Experiment 1 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.03 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Breast adenocarcinoma	SK-BR-3 cells		CVCL_0033
Experiment 2 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.12 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Ovarian serous cystadenocarcinoma	SK-OV-3 cells		CVCL_0532
Experiment 3 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.60 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603
Experiment 4 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	> 50.00 nM	Moderate HER2 expression (HER2 ++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Breast ductal carcinoma	JIMT-1 cells		CVCL_2077
Experiment 5 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	> 50.00 nM	Negative HER2 expression (HER2 -)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Invasive breast carcinoma	MCF-7 cells		CVCL_0031

Experiment 1 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.01 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Breast adenocarcinoma	SK-BR-3 cells		CVCL_0033
Experiment 2 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.02 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Ovarian serous cystadenocarcinoma	SK-OV-3 cells		CVCL_0532
Experiment 3 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.02 nM	Moderate HER2 expression (HER2 ++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Breast ductal carcinoma	JIMT-1 cells		CVCL_2077
Experiment 4 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	0.03 nM	High HER2 expression (HER2 +++)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Gastric tubular adenocarcinoma	NCI-N87 cells		CVCL_1603
Experiment 5 Reporting the Activity Date of This ADC					[1]
Efficacy Data	Half Maximal Inhibitory Concentration (IC50)	> 50.00 nM	Negative HER2 expression (HER2 -)
Method Description	With OHPAS ADCs 1-4 , we first performed cell-based MTT assays against a series of HER2 positive/negative cell lines using the commercially available HER2 ADC, T-DM1 (average DAR 3.5), which we purchased as a positive control.
In Vitro Model	Invasive breast carcinoma	MCF-7 cells		CVCL_0031

Ref 1	Aryl Sulfate is a Useful Motif for Conjugating and Releasing Phenolic Molecules: Sulfur Fluorine Exchange Click Chemistry Enables Discovery of Ortho-Hydroxy-Protected Aryl Sulfate Linker. Bioconjug Chem. 2019 Jul 17;30(7):1957-1968. doi: 10.1021/acs.bioconjchem.9b00340. Epub 2019 Jun 28.