Carboplatin and Paclitaxel Chemotherapy Regimen - Ovarian Cancer Treatment

Why is adjuvant treatment given? (Targeting “invisible” cells)

Even if all visible tumor tissue has been surgically removed, cancer cells that may remain at a microscopic level can increase the risk of recurrence . Adjuvant chemotherapy targets these “invisible” cells, aiming to reduce recurrence risk and improve long-term survival . Therefore, after surgery for early/intermediate-stage ovarian cancer, carboplatin + paclitaxel is a standard option in international guidelines .

How do Carboplatin and Paclitaxel work? (Mechanism)

• Carboplatin: By forming cross-links in DNA, it inhibits DNA copying (replication) . Rapidly dividing cancer cells die because they cannot repair this damage.
• Paclitaxel: It acts on components of the cell skeleton by stabilizing microtubules and disrupting their flexibility; this prevents cells from entering mitotic division .

The two-drug combination (carbotaxol) targets different stages of the cell cycle to produce a stronger combined effect .

What is the treatment goal? (Expectations)

• Main goal: To reduce recurrence risk and improve long-term survival.
• Symptom and complaint control: It may contribute to reducing cancer-related complaints after surgery.
• Realistic expectation: Adjuvant chemotherapy increases the chance of recovery; reducing recurrence to %0 in every patient is not possible. The treatment decision is individualized according to stage, tumor biology, surgical outcome and the patient’s general condition.

Administration, Dose and Schedule (How is it given?)

Standard 21-day cycle (course)

• Carboplatin: AUC 5–6, day 1 IV infusion (at least 30 minutes; generally 60–120 minutes).
• Paclitaxel (per cycle): 175 mg/m², day 1 IV (at least 1 hour; often administered over 3 hours).
• Frequency: Every 21 days the cycle is repeated.

Weekly variant (in selected patients)

• Carboplatin: AUC 5–6, day 1 IV.
• Paclitaxel (weekly): 80 mg/m², days 1, 8 and 15 IV (approximately 60 minutes).
• Frequency: Over 28 days, 3 administrations (may vary according to the center’s protocol).

What can you expect on treatment day? (Process)

1. Admission and measurements: Vital signs, intravenous line/port check.
2. Laboratory clearance: Complete blood count, biochemistry and, when needed, CA-125 results are used for physician clearance.
3. Premedication: Drugs to reduce the risk of allergy and nausea (below).
4. Infusions: Paclitaxel and/or carboplatin are administered according to the protocol.
5. Observation and discharge: Returning home after a short period of monitoring.

Premedication to reduce allergy risk (Safety)

• Paclitaxel is prone to infusion reactions. Therefore, premedication containing an antihistamine and a corticosteroid is given.
• Before and after administration, dexamethasone 8 mg tablet schedules are planned specifically by your center; your nurse gives you a written timetable.
• Carboplatin allergy can occur especially after multiple cycles ; if it develops, options for continuing treatment in suitable patients at specialist centers with desensitization protocols are discussed.
• When necessary, to prevent low white blood cell counts, G-CSF (filgrastim, pegfilgrastim, etc.) may be planned as prophylaxis.

Practical Notes (Hair loss & nausea)

• Hair loss: Temporary. In suitable patients, it can be reduced with a scalp cooling cap .
• Nausea-vomiting: With current antiemetics, in most patients it can be controlled. Individual adjustments are made after the first cycle.