Ketotifen for Oxaliplatin-Induced Nerve Pain

Inclusion Criteria: * Patients with histologically confirmed diagnosis of Stage III colorectal cancer. * Patients who will be scheduled to receive modified FOLFOX-6. * Patients with no contraindication to chemotherapy. * Males and females aged ≥ 18 years old. * Adequate baseline hematologic values (absolute neutrophilic count ≥ 1.5 × 109/L, platelet count ≥ 100 × 109/L and hemoglobin level ≥ 10 g/dl). * Patients with adequate renal function (serum creatinine \< 1.5 mg/dl or creatinine clearance (ClCr) ˃ 45 mL/min). * Patients with adequate liver function (serum bilirubin \< 1.5 mg/dl). * Patients with performance status 0-1 according to Eastern Cooperative Oncology Group (ECOG) score. Exclusion Criteria: * Children \< 18 years old. * Prior exposure to neurotoxic chemotherapy (Oxaliplatin, cisplatin, vincristine, paclitaxel, or docetaxel, INH) for at least 6 months prior the study treatment. * Evidence of pre-existing peripheral neuropathy resulting from another reason (diabetes, brain tumor, brain trauma). * Patients with diabetes and other conditions that predispose to neuropathy as hypothyroidism, autoimmune diseases, hepatitis C. * History of known allergy to oxaliplatin or other platinum agents. * Patients with other inflammatory or stressful conditions. * Patients with glaucoma, cataract, other chronic eye disease, seizure, diabetes, heart diseases, low blood pressure, dizziness, vertigo, ménière's disease and CNS disorders. * Concomitant use of multivitamins (vitamins E, C, A), tricyclic antidepressants, other neuro-protective medications (gabapentin, lamotrigine, carbamazepine and phenytoin, etc…). * Patients on amifampridine, bupropion and donepezil. * Concurrent active cancer originating from a primary site other than colon or rectum. * Pregnant and breastfeeding women.