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Understanding your treatment plan

Why Your Oncologist Chose This Particular Drug

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

The drug on your prescription was chosen for a reason. Your oncologist matched it to your cancer, your test results and your body's capacity to handle treatment. The choice is not arbitrary, and you have the right to understand it.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

Prescription-only medicine.

This is a prescription-only chemotherapy medicine, given only under the supervision of a specialist oncologist in a hospital or licensed treatment facility. No information on this page constitutes medical advice, and no chemotherapy treatment should be started on the basis of anything read online. It is not suitable for everyone — see who this is not for below.

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In short

Your oncologist chose this drug by matching it to your cancer type, stage, tumour biology, organ function and overall fitness. There is no universal best chemotherapy drug — the right drug is the one matched to your cancer at this stage in your body. Ask your oncologist to explain the specific reasons for your case.

In detail

What does your oncologist look at when deciding which drug to use?

The starting point is your cancer type and its subtype. Not all breast cancers respond to the same drugs, and not all lung cancers are treated the same way — the specific category of cancer, confirmed by the pathology report on your biopsy, is the first filter.

Your stage matters because drugs suited to early disease are not always appropriate in advanced disease, and the spread of the cancer — whether it is confined to one site or has reached lymph nodes or other organs — changes what treatment is intended to achieve.

Your organ function is tested with blood tests before any drug is selected. If your kidneys, liver or heart are under significant strain, certain drugs are avoided because they would add to that strain. Your overall fitness — called performance status in oncology — also determines whether your body can handle a single drug or a combination.

In detail

Does the molecular profile of your tumour change the drug choice?

For some cancers, yes — and this area of testing is growing. Certain gene mutations or protein markers on the tumour surface are used to guide drug selection because they indicate whether a particular drug is likely to be active in your tumour.

Examples include hormone receptor testing in breast cancer, KRAS and BRAF testing in colorectal cancer, and HER2 testing across several cancer types. This testing is typically done on the biopsy or surgical specimen you have already provided.

Not every cancer type has well-established molecular markers yet. If your oncologist has not mentioned specific marker tests, it may be because the evidence for those tests does not yet exist for your cancer. Asking 'was molecular testing done on my tumour, and what did it show?' is a reasonable question to put at your next appointment.

Eligibility

Who may not be suitable for the chemotherapy named for you

Chemotherapy is not the right treatment for every person diagnosed with cancer, and the specific drug your oncologist has named may not be appropriate in certain situations. The following groups are generally not treated with cytotoxic chemotherapy, or require a significantly modified approach:

People with severely reduced kidney or liver function, as most chemotherapy drugs are processed through these organs and toxicity can accumulate dangerously.
People whose performance statusTheir overall functional capacity — means the expected burden of treatment is likely to outweigh the expected benefit.
People with a prior severe or life-threatening reaction to the drug or its drug class.
Pregnant women, particularly in the first trimester, where the risk to the developing foetus is highest.

Eligibility for a specific chemotherapy drug is decided by an oncologist after reviewing your individual medical history, blood results, imaging and biopsy findings. No general list applies to individual cases.

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In detail

Can you ask for a different chemotherapy drug?

Yes. Asking your oncologist to explain why this drug and not another is a legitimate part of your consultation. A clear explanation of the reasoning — which evidence the choice draws on, which guidelines it follows, and which factors in your case shaped the decision — is reasonable to expect.

If you have read about or heard of a different drug, raise it directly. Your oncologist's response will tell you whether that drug applies to a different cancer type or stage, whether it was considered and set aside, or whether it is worth revisiting for your case.

Seeking a second opinion from another oncologist is also a reasonable step. A responsible clinician will not be offended. A second opinion sometimes confirms the original plan and sometimes opens a conversation about alternatives — both outcomes are useful.

Worth knowing

Did you know?

Two people diagnosed with the same cancer on the same day may be prescribed completely different chemotherapy drugs. This is not inconsistency — it reflects differences in tumour biology, organ function, stage and prior treatment history.

NCCN and ESMO guidelines treat each of those variables as a separate decision factor, which is why the same cancer name does not produce a single universal treatment.

Source: NCCN Clinical Practice Guidelines in Oncology; ESMO Clinical Practice Guidelines, 2025

Still have a question about your treatment? Tell us what is on your chart and an oncologist will explain what it means for you, what to expect and what your schedule is likely to look like.

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Common questions

Frequently asked questions

What if I have read about a different drug that seems to work better?

A drug that produces strong results in one cancer type is often ineffective or harmful in another — the same name does not translate across different cancers. Bring the drug name to your oncologist and ask directly: was this considered for my case, and if not, why? That is a useful conversation to have. The answer will usually explain whether the drug applies to your cancer type and stage, or whether there is a specific reason it was set aside for you.

Why are some people given a combination of drugs and others just one?

Whether you receive a single drug or a combination depends on your cancer type, your stage, and what your body is judged able to tolerate. Some cancers are treated with combinations where each drug acts on a different pathway; others are treated with one drug at a time to keep side effects manageable, particularly when fitness or organ function is a concern. NCCN and ESMO guidelines generally specify whether combination or single-agent treatment is the recommended approach for your cancer type and stage.

Does it matter that I have other health conditions besides cancer?

Yes, and this is one of the factors your oncologist weighs carefully. Certain drugs place particular strain on the kidneys, the liver, the heart or the nerves, and if any of those organs are already affected by another condition, those drugs may be avoided or approached differently. Conditions such as diabetes, high blood pressure, a previous heart attack, or reduced kidney function can all influence drug selection. Tell your oncologist about every medicine you are taking, including supplements and herbal preparations, because some of these interact with chemotherapy.

What should I ask my oncologist before chemotherapy starts?

Four questions cover what most people need to know: What is the name of the drug and why was it chosen over alternatives? What side effects are most likely, and which ones need a same-day call? How will we know whether it is working? And how long will this course last? Writing the answers down helps — these conversations are hard to recall afterwards. A clinical nurse or counsellor at your treating centre can usually answer follow-up questions between appointments.

Can the drug be changed if it causes too many side effects or stops working?

Yes. The drug choice at the start of treatment is not fixed permanently. If a review shows the treatment is not having the expected effect, or if side effects are significantly affecting your quality of life, switching to a different regimen is a standard part of cancer care. Prompt reporting helps — if side effects are affecting you between appointments, contact your treating team rather than waiting for the next scheduled visit, so your oncologist has the information needed to act.

Is the drug choice based on published guidelines or on personal judgement?

Both, and that combination is by design. Bodies such as NCCN, ESMO and ASCO publish detailed recommendations for each cancer type, stage and molecular profile, and most oncologists follow those recommendations as a framework. Within that framework, your oncologist's clinical experience and the specific features of your case shape the final decision. If you want to know which guideline your treatment plan is based on, that is a reasonable question to ask, and a responsible oncologist will answer it.

Who would be treating you

The medical oncologists on the CION panel

Chemotherapy is prescribed, dosed and supervised by a medical oncologist. These are the six on the CION panel.

Dr. Naresh Gundu

Medical Oncologist

MBBS · DNB Internal Medicine (Sir Gangaram, New Delhi) · DM Medical Oncology (AIIMS)

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Dr. C. Raghavendra Reddy

Medical Oncologist

MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Kukatpally

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Dr. Bharati Devi Gorantla

Medical Oncologist

MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK)

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Dr. Owais Mohammed

Medical Oncologist

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Dr. T. Raghavender Reddy

Medical Oncologist

MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · L.B. Nagar

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Dr. N. Kiranmayee

Medical Oncologist

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Which oncologist you see depends on the centre nearest you and on what your treatment involves. Tell us where you are and we will point you to the closest.

Talk it through

Reading about a medicine is not the same as being told what to expect

This page explains what the medicine does in general. What it cannot tell you is how your own regimen was chosen, what your schedule looks like, or which of these effects apply to you — that needs your reports and a conversation.

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