Table 2 Combination therapy.

From: PD-L1 degradation pathway and immunotherapy for cancer

Degradation by

Regulatory signal

Therapy

Cancer types

Reference

Proteasome

EGFR/GSK3β/β-TrCP

Gefitinib + anti-PD-1

Colon cancer, TNBC

13

Proteasome

NFκB/CSN5

Curcumin + anti-CTLA4

TNBC, colon cancer, melanoma

22

Proteasome

AMPK

Metformin + CTLA4

Breast cancer, lung cancer

21

Proteasome

EMT/β-catenin/STT3

Etoposide + anti-Tim-3

Colon cancer, TNBC

23

Lysosome

EGFR/B3GNT3

STM108-MMAE conjugate

TNBC

31

Lysosome

CMTM6

H1A + cisplatin

Breast cancer, colon cancer

30

Proteasome

CDK4/6/ cullin3SPOP

Palbociclib + anti-PD-1

Colon cancer

11