A tumor-promoting function for TSLP was demonstrated in pancreatic cancer, where predominant Th2 (GATA-3+) over Th1 (T-bet+) cells within the lymphoid infiltrate in the tumor stroma was associated with reduced survival in pancreatic cancer patients, thus implying an active role for Th2 immunity in tumor progression (23). The gene discussed is GATA3; the disease is neoplasm.