Effect of Vitamin D Supplementation on Chemotherapy Side Effects After Adjuvant Chemotherapy for Breast Cancer

Before the start of treatment and every 3 weeks thereafter, participants will receive a 10 mg dose of vitamin D2 injection until adjuvant chemotherapy is completed. They will receive a standard adjuvant chemotherapy regimen, which includes 10 mg of vitamin D2 injections per cycle during treatment. The dosage of adjuvant chemotherapy drugs can be customized according to the clinical judgment of the doctor.

Participants will receive a standard adjuvant chemotherapy treatment regimen for each adjuvant chemotherapy cycle. The dosage of adjuvant chemotherapy drugs can be customized according to the clinical judgment of the doctor.