Table 1.

Biological function of Rab27A and Rab27B

	Rab27A	Rab27B
Promote cell growth (in vitro)	• Melanoma cells (WM1385, WM1960) [34]	• Breast cancer cells (MCF-7, T47D, ZR75.1) [35]
Promote tumor growth (in vivo)	• Melanoma cells (SK-Mel-28, B16-F10) [26] • Breast cancer cells (4T1) [25]	• Breast cancer cells (MCF-7) [35]
Promote cell invasion (in vitro)	• Bladder cancer cells (T24, FL3) [27]	• Bladder cancer cells (T24, FL3) [27] • Breast cancer cells (MCF-7, T47D) [35]
Promote tumor metastasis (in vivo)	• Melanoma cells (SK-Mel-28, B16-F10) [26] • Breast cancer cells (4T1) [35]	• Breast cancer cells (MCF-7) [35]
Increase chemoresistance (in vitro)	––	• Breast cancer cells (MCF-7) [37]
Increase exosome secretion (in vitro)	• Bladder cancer cells (T24, FL3) [27] • Cervical cancer cells (HeLa) [23] • Breast cancer cells (MDA-MB-231, 4T1) [24, 25] • Melanoma cells (SK-Mel-28, B16-F10) [26] • Lung adenocarcinoma cells (A529) [28]	• Bladder cancer cells (T24, FL3) [27] • Cervical cancer cells (HeLa) [23] • Increase V-ATPase in exosome secretion of breast cancer cells (MCF-7) [49] • Increase HSP90α in exosome secretion of breast cancer cells (MCF-7) [35]