1.	Oral Zinc Therapy for the Prevention of Mucositis Phase: Phase IV Type: Supportive care, Treatment Status: Completed Age: 18 to 70 Sponsor: Other Protocol IDs: SHEBA-06-4196-MKM-CTIL, NCT00449592
2.	Prevention Chemotherapy Induced Mucositis by Zinc Sulfate Phase: Phase III, Phase II Type: Supportive care, Treatment Status: Completed Age: Any age Sponsor: Other Protocol IDs: HORCSCT-0904, NCT01015183
3.	Phase III Randomized Study of Zinc Sulfate for the Prevention of Altered Taste in Patients With Head and Neck Cancer Undergoing Radiotherapy Phase: Phase III Type: Supportive care Status: Completed Age: 18 and over Sponsor: NCI Protocol IDs: NCCTG-N01C4, NCI-P02-0224, N01C4, NCT00036881
4.	Study of the Effect of Nutritional Intervention on Esophageal Cancer in Linxian, People's Republic of China (Summary Last Modified 10/88) Phase: Phase III Type: Prevention Status: Completed Age: 40 to 69 Sponsor: Protocol IDs: DCPC-CPSB-11204
5.	A Phase 2 Clinical Trial of the Safety and Effects of IRX-2 in Treating Patients With Operable Head and Neck Cancer Phase: Phase II Type: Treatment Status: Completed Age: 18 to 80 Sponsor: Pharmaceutical / Industry Protocol IDs: IRX-2 2005-A, NCT00210470