Coenzyme Q10 for Neuroprotection in Paclitaxel-Induced Neuropathy

Fifty female patients with newly diagnosed breast cancer scheduled for weekly paclitaxel chemotherapy (80 mg/m2) will be randomized in a 1:1 ratio into two study arms. The CoQ10 Group will receive Coenzyme Q10 supplementation (200 mg twice daily) for twelve weeks in addition to the standard chemotherapy protocol, while the Control Group will receive the standard chemotherapy protocol alone. Clinical assessments for peripheral neuropathy, including grading via NCI-CTCAE v5.0, will be conducted prior to the initiation of each weekly paclitaxel session to monitor for symptom onset and severity. Patient-reported outcome measures for neuropathy-specific quality of life (FACT/GOG-Ntx12), fatigue (FACIT-F), and pain intensity (VAS) will be administered at baseline and at the end of weeks 3, 6, 9, and 12. To specifically assess pain interference and severity over time, the Brief Pain Inventory (BPI) will be administered at week 6 and week 12. For the exploratory biomarker analysis, 5 mL of venous blood will be collected via antecubital venipuncture at baseline (one hour before the first cycle) and one hour after the final paclitaxel dose. Samples will be allowed to clot at room temperature for 30 minutes, then centrifuged at 3,000 rpm for 15 minutes. The resulting serum will be aliquoted and stored at -80 degrees Celsius. Biochemical quantification of NGF, NfL, and OPN will be performed using double-antibody sandwich ELISA, and MDA levels will be determined via colorimetric assay to evaluate oxidative stress and axonal integrity. All participants will be followed for a total of 90 days from the start of treatment to evaluate the time to development of Grade 2 or 3 neuropathy.