Chemoradiation: Radiation and Chemotherapy Together
Radiation oncology is the specialty that plans and delivers radiation, and chemoradiation is what it's called when chemotherapy is given alongside it. Why combine two strong treatments? Because together they can control some tumours that either one might not manage alone. This page explains how the combination works, which cancers Dr. Karan uses it for, who gives each part, and what the weeks of treatment at Apollo Hospital, Financial District are like.
Reviewed by Dr. P. Vijay Karan Reddy · Radiation Oncologist ·
Last updated October 2026
Radiation oncology is the specialty that plans and delivers radiation, including chemoradiation, where chemotherapy is given during the radiation course. Some chemotherapy drugs make cancer cells more sensitive to radiation, which can improve tumour control. Chemoradiation suits some advanced cancers and usually causes stronger side effects than either treatment alone.
What Is Chemoradiation in Radiation Oncology?
Picture hearing your plan is "chemoradiation" and wondering if that's one treatment or two. It's two, given together. Radiation is aimed at the tumour on weekdays, while chemotherapy, given as a drip or, for gliomas and rectal cancers, as daily tablets, travels through the whole body. The team plans them as one course.
Older plans often used radiation alone, or ran the two treatments in separate stages. Combining them closely changed what's possible for several cancers. As the National Cancer Institute explains, chemotherapy can make cancer cells easier for radiation to destroy. Radiation oncology teams now plan this combination around each patient.
How Chemoradiation Works: Why the Two Treatments Help Each Other
Each treatment does a different job. Here's what each one contributes, and why the pair can beat either alone.
Chemoradiation by Cancer Type
He also uses it for stage 2 to 3 rectal cancer. These four show how the approach differs.
Your Radiation Oncology Care Team
Every specialist works from one tumour-board plan: evidence-based, unbiased toward any specialty, and mindful of your physical, mental and social wellbeing.
Chemoradiation vs. Radiation Alone and vs. Surgery
Adding chemotherapy helps in some cancers and not others. Here's how chemoradiation compares in plain terms, and what each choice trades off.
Chemoradiation vs. radiation alone
Adding chemotherapy can improve local control for some advanced cancers, meaning the cancer is less likely to come back where it was treated. The price is stronger side effects and more visits. Our view: add it only when the expected gain clearly outweighs the extra strain.
Chemoradiation vs. surgery
For some cancers, chemoradiation can control the tumour without removing the organ, such as the voice box in larynx cancer, so speech and swallowing may be preserved. Surgery removes the tumour directly and gives a full pathology report. The tumour board weighs both.
Preparing for Chemoradiation
Chemoradiation means two teams preparing at once, so expect a few extra checks and appointments before day one.
Radiation Oncology Treatment Timing: Concurrent, Sequential and Induction
Two treatments, three ways to time them. The type and stage of your cancer decide which fits, along with your fitness. When Dr. Karan talks about chemoradiation, he mainly means concurrent. Head and neck cancer is most often treated that way, and lung cancer can use any of the three.
What a Treatment Day Looks Like
- 01
Check-in
At Apollo Hospital, Financial District, the team checks you in and confirms today's plan. On chemotherapy days, your blood results are reviewed before the dose.
- 02
Chemotherapy, on chemo days
The medical oncologist's team gives the drugs, often through a drip or, for gliomas and rectal cancers, as tablets. The drip goes in before that day's radiation, usually once a week on the same day, like every Monday, and it takes 6 to 7 hours. Some plans run every three weeks instead, depending on your general condition and the oncologist's preference. Both are valid. Tablets are taken daily, 2 to 3 hours before you come for radiation.
- 03
Positioning
Therapists settle you into your mask or cushion and use the room's lasers to match your planning position.
- 04
Radiation delivery
The radiation takes only a few minutes, and you won't feel it. The team watches on camera throughout. Treatment runs on a TrueBeam STx linear accelerator with HyperArc, with kV and cone-beam imaging.
- 05
Finishing up
You head home. Radiation runs on weekdays and chemotherapy follows its own calendar. Gliomas take 30 radiation sessions with daily chemotherapy. Head and neck cancer takes 30 to 33 sessions over about 6 weeks, with chemotherapy once a week for 6 weeks. Cervical and rectal cancer radiation runs 25 sessions.
Radiation Oncology Side Effects When Chemo Is Added
Will it be harder than radiation alone? Usually, yes. Combined treatment tends to hit harder than either one alone, and the team plans for that.
Short-Term Effects
Tiredness, nausea, low blood counts, mouth or throat soreness and skin redness are more common than with radiation alone. Anti-sickness medicines, mouth and skin care, diet advice and blood checks keep most of these manageable.
Long-Term Effects
Late effects depend on the area treated, the total dose and the drugs used. They can include dryness, stiffness or changes in swallowing or bowel habit. Follow-up visits catch these early, when they're easiest to treat.
Recovery Between Sessions
Expect to be more tired than usual through the course and for some weeks after. Rest, fluids, small frequent meals and light activity help. Call the team early about fever, vomiting or being unable to drink.
Considering Chemoradiation? Get a Second Opinion First
Not sure you need both treatments, or whether your current plan times them well? Send your scans and reports. Dr. Karan will check the timing and dose of the radiation, say when radiation alone or surgery may be enough, and bring in the medical oncologist on the chemotherapy. He has eleven years in radiation oncology.
What Happens After Treatment
The combined effect keeps building for weeks after your last session. Here's the general roadmap, not a personal schedule.
Your timing depends on the cancer treated, your plan and your recovery. Your follow-up schedule is agreed with both specialists, Dr. Karan and the medical oncologist, before treatment ends.
Questions Patients Ask Us
Chemoradiation is radiation and chemotherapy given as one planned course. Some of the drugs make cancer cells more sensitive to the radiation.
To make each radiation dose work harder. Some drugs weaken cancer cells' ability to survive radiation, and they also reach cells outside the beam.
Dr. Karan uses it for grade III and IV gliomas, advanced head and neck cancers, advanced cervical cancer, limited stage small cell lung cancer, non-small cell lung cancer at stage 3 and 4 that's confined to the lung, and rectal cancer at stage 2 to 3.
Radiation usually runs on weekdays over several weeks, with chemotherapy on set days within that period. At Dr. Karan's centre, gliomas take 30 radiation sessions, head and neck cancer 30 to 33 over about 6 weeks, and cervical and rectal cancer 25.
Radiation thins hair only where it's aimed, so treatment to the brain or head area can cause patchy loss there. Some chemotherapy drugs also thin hair, and your medical oncologist will say whether yours does.
Many people manage light work early in the course, but tiredness builds over the weeks. Plan flexible hours and talk to the team about your job.
It depends on the cancer, the radiation technique, the chemotherapy drugs and the hospital, so there's no single price. Radiation at Dr. Karan's centre costs ₹2.5 lakh with IMRT and ₹4.5 lakh with IGRT; the medical oncologist quotes the chemotherapy.
Yes. Dr. Karan practises radiation oncology in India at Apollo Hospital, Financial District, Hyderabad, where a medical oncologist gives the chemotherapy.
For some cancers, yes, and the aim is cure. For others the aim is to control the disease and ease symptoms, depending on cancer type and stage.
No. Dr. Karan delivers the radiation and a medical oncologist gives the chemotherapy, and the two coordinate your schedule.
Get a Clear Plan for Combined Treatment
Send your scans and reports, and Dr. Karan will explain whether chemoradiation fits your case and how the radiation and chemotherapy teams will work together. No hard sell, just a clear plan.
Written & reviewed by Dr. P. Vijay Karan Reddy ·
Radiation Oncologist · Last reviewed October 2026