FOXP1 and pituitary tumor: Additional molecules and intracellular systems, including Forkhead box P1 (FOXP1)-induced long noncoding RNA CLRN1-AS1 [49], endoplasmic reticulum (ER) stress [51], hypoxia-inducible factor 1α (HIF-1α) [52], and the AMPK- ULK1 pathway [54], are also involved in the regulation of autophagy that controls pituitary tumor growth and/or hormone production via autophagy.