CION Ameerpet
Radiation Therapy · Theranostics & Radioisotope Therapy
Samarium and Strontium Injections — For Widespread Bone Pain
Medically reviewed by Dr. Venkata Sushma P, Radiation Oncologist (MBBS · MD, Radiation Oncology) · Last reviewed August 2026
When cancer has settled in bone in several places at once, aiming a radiation machine at each painful spot one after another stops being practical. A bone-seeking injection takes the opposite route — it travels in the bloodstream and gathers in painful deposits everywhere at the same time. This page answers the three questions families ask first, without hype and without promises.
- Every painful site, one dose — a single injection reaches bone deposits throughout the skeleton instead of treating one area at a time.
- Who it suits, stated plainly — the bone scan finding and the blood counts that decide whether this is even possible for you.
- A realistic relief timeline — when pain usually starts easing, and the short flare some people feel first.
- Coordinated, not outsourced — given at an NABH-accredited partner nuclear medicine centre, with your CION team managing the plan.
17+
Cancer Specialists
on Panel
on Panel
35+
Centres across
Telangana & AP
Telangana & AP
15,000+
Patients
Treated
Treated
4.8★
Google Rating
(800+ reviews)
(800+ reviews)
The short answer
What are samarium and strontium injections?
Samarium-153 and strontium-89 are bone-seeking radioisotopes, given as a single injection into a vein. They collect in areas of high bone turnover, which is exactly where cancer deposits in bone sit. From there each one releases short-range radiation into those deposits, aiming to reduce bone pain across the whole skeleton at once.
Aiming a radiation machine at a painful bone works very well when one or two places hurt. The problem this injection solves is different. When six, eight or ten places hurt, treating them one after another means weeks of daily hospital trips, and there is a limit to how much bone marrow can safely be irradiated along the way. A bone-seeking injection sidesteps that by travelling in the bloodstream and settling wherever the bone is trying to repair itself.
These injections are used for pain control. They are not a treatment for cancer elsewhere in the body, and they are not offered as an alternative to the treatment your medical oncologist has planned. They sit alongside it, as one more thing that can be done when pain is coming from too many sites to handle one at a time.
Bone-seeking radioisotope injections are given at an NABH-accredited partner nuclear medicine centre; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout. CION does not own or operate a nuclear medicine facility, a linear accelerator or any other radiotherapy equipment.
Did you know?
Bone-seeking radioisotopes are not experimental. Strontium-89 and samarium-153 have been used for painful bone metastases since the 1990s, and guidance from bodies such as ASTRO and NCCN still lists bone-seeking radiopharmaceuticals as an option for pain that is coming from many sites at once rather than from one. Ask your team about it by name if nobody has raised it.
Question one
How do samarium and strontium injections work?
Bone under attack from cancer tries to repair itself, and that repair activity pulls in calcium-like minerals. Samarium and strontium behave chemically like calcium, so they follow the same signal and gather in the deposits. Once there, they release radiation over a very short distance, treating the deposit and sparing tissue further away.
That short range is the whole point. The radiation does not travel far enough to reach the rest of your body, but it does not need to — it is already sitting inside the bone that hurts. Here is what the process actually looks like from your side.
1
A bone scan decides whether this can work at all
The bone scan you have probably already had is the eligibility test. It detects the same repair activity the injection follows. If your painful areas light up on that scan, they can usually be reached. If they do not, the injection has nothing to attach to.
2
Blood tests before the dose
Haemoglobin, white cells, platelets and kidney function are checked. Platelets matter most, because a fall in counts is the main expected side effect. If counts are still recovering from recent chemotherapy or wide-field radiation, the injection is postponed rather than pushed through.
3
The injection itself
It is one slow injection into a vein at the nuclear medicine unit, and it takes minutes rather than hours. There is no machine, no mask and no immobilisation. For these two isotopes an isolation room stay is not usually needed, and most people go home the same day.
4
A few days of simple precautions at home
Whatever the bone does not take up leaves in your urine over the first days. You are given written hygiene rules — toilet use, flushing, handwashing, laundry, and extra steps if you use a catheter or have leakage. They are short-lived and dated on your own instruction sheet.
5
Pain review and blood counts over the following weeks
Your team tracks two things: whether your pain is easing and whether your counts are behaving. Both take weeks, not days. A repeat dose is only discussed once counts have recovered and only if the first injection actually helped.
Question two
Who is suitable for a samarium or strontium injection?
It suits people whose pain comes from several bone deposits at once, where those deposits take up the tracer on a bone scan and blood counts are strong enough. It does not suit a single painful site, deposits that do not show on the scan, pressure on the spinal cord, or a bone close to fracturing.
What a team is usually looking for
- Pain coming from more than one or two places in the skeleton, rather than one dominant site.
- A recent bone scan showing that the painful areas take up the tracer — this uptake is the eligibility test, not a formality.
- Blood counts, especially platelets and white cells, above the threshold your treating centre uses.
- Kidney function adequate enough to clear the isotope that bone does not take up.
- Enough general fitness to attend a day-case appointment and to follow simple hygiene instructions at home, or a carer who can help with them.
- A treating-team decision made together by your medical oncologist, radiation oncologist and nuclear medicine physician — not a decision made on request.
When something else is the better answer first
- Only one or two painful sites. A short course of external beam radiation, sometimes a single session, usually does the job faster. Our page on single versus multiple radiation sessions for bone metastases explains that choice.
- New weakness in the legs, numbness, or loss of bladder or bowel control. This can mean pressure on the spinal cord. It is an emergency and is treated urgently — not with an injection that takes weeks to act.
- A bone that has cracked or looks close to cracking. An orthopaedic opinion and fixation come first; radiation or an injection afterwards.
- Blood counts that have not recovered from recent chemotherapy or from radiation to a large area of marrow. This is a wait, not a refusal.
- Painful areas that do not show uptake on the bone scan. The injection cannot reach what the scan cannot see, and no amount of willingness to pay changes that.
If new leg weakness, numbness or loss of bladder or bowel control has started, do not wait for an appointment. Call 1800 202 8726 now or go to the nearest emergency department. Spinal cord compression is treated in hours, not weeks.
12+ Centres in Hyderabad · Pick yours
CION cancer care is closer than you think.
We're never more than 30 minutes away. Same panel of specialists at every centre. Same tumour board reviews. Same NCCN protocols. Pick the closest one and call directly — or let us pick for you.
CION Ameerpet
CION Kukatpally
CION L.B. Nagar
CION Tolichowki
CION Masab Tank
CION Banjara Hills
CION Kompally
CION Balanagar
CION Siddipet
CION Sangareddy
Not sure which centre fits best? Tell us where you are — we'll suggest the closest one with the right specialists.
Help me pick the right centre
Beyond Hyderabad
35+ centres across Telangana & Andhra Pradesh
Travelling for treatment? We may have a centre right where you are.
Telangana
Andhra Pradesh
Don't see your city? Call 18002028726 — we'll find your nearest CION partner centre.
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Interventional Radiologist
Dr. Mohammed Imran
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Get a second opinion before the pain plan is settled
Bone pain from many sites has more than one answer, and the order they are tried in matters. One review of your scans and reports is free, confidential and carries no obligation to start treatment.
Question three
How fast does the pain relief come?
Not the same day. Among people who respond, the change is usually noticed between one and four weeks after the injection, and it builds rather than switches on. Some feel a short increase in bone pain in the first few days before it settles. Where relief comes, it commonly lasts some months.
The single most useful thing you can do is keep a simple daily pain score from the day of the injection — a number out of ten, written down. Memory flattens a slow improvement into “about the same”, and that is how a working treatment gets abandoned. Here is the rhythm most people follow.
| When | What commonly happens | What to do |
|---|---|---|
| Injection day | One slow injection, a short period of observation, then home in most protocols | Drink fluids and pass urine often. Collect your written hygiene instructions before you leave, and have them explained to whoever is at home with you |
| First few days | A short-lived flare of bone pain in a minority of people, before any improvement appears | Do not stop your pain medicines. Tell your team — a flare is usually managed by adjusting what you already take, and it is not a sign the treatment has failed |
| Weeks one to four | If pain relief is going to come, this is usually the window in which it starts | Keep the daily pain score. Note how far you can walk and whether you sleep through the night — those change before the number does |
| Weeks three to six | Blood counts typically reach their lowest point in this period | Attend the blood test even if you feel well. Report fever, unusual bruising, bleeding gums or nosebleeds the same day |
| Weeks six to ten | Counts usually recover; your team reviews how much the pain has actually changed | Bring the pain diary. Pain medicines are stepped down gradually rather than stopped, and only on your team’s advice |
| Later, if pain returns | A repeat injection may be considered, or a single session of external beam radiation to a new dominant site | Ask for the reasoning either way. A repeat is offered only if counts have recovered and the first injection helped |
Not everyone responds. That is an honest part of this conversation, and it is why the pain diary matters — it tells your team when to stop waiting and try a different route instead.
How it compares
Injection, external beam or radium-223 — what is the difference?
These are not rivals. They answer different versions of the same problem, and many people are offered more than one over time.
| External beam radiation to a painful site | Samarium-153 or strontium-89 injection | Radium-223 | |
|---|---|---|---|
| What it is mainly for | Pain from one or a few specific sites | Pain from many bone sites at once | Prostate cancer that has spread to bone — aimed at the disease, not only the pain |
| How it is given | Sessions on a machine, sometimes a single session | One injection into a vein | A series of injections, usually spaced about a month apart |
| Where it acts | Only the area the machine is aimed at | Bone deposits throughout the skeleton | Bone deposits throughout the skeleton |
| Usual eligibility test | Imaging that shows the painful site | A bone scan showing uptake at the painful areas | A confirmed diagnosis and a treating-team decision |
| How soon relief is judged | Often within days to a couple of weeks | Usually one to four weeks | Assessed across the course, not after one dose |
| Main limitation | One area at a time; marrow dose adds up if many areas are treated | Needs adequate blood counts; not for cord compression or a bone at risk of fracture | Limited to a specific prostate cancer setting |
If prostate cancer is the diagnosis, read radium-223 for prostate cancer bone metastases before deciding — it is a different kind of isotope with a different purpose, and the two are often confused.
What it costs you physically
What are the side effects, and am I radioactive afterwards?
The main effect is a temporary fall in blood counts, usually lowest around three to six weeks after the injection and recovering over the following weeks. A short pain flare in the first days is common. Radioactivity is low and short-lived, so simple toilet and hygiene rules for a few days are usually enough.
There is no hair loss, no daily hospital trip and no mask. What there is instead is a quiet dip in your marrow that you cannot feel, which is why the blood test a few weeks later is not optional even if you feel fine.
Call your team the same day if you notice
- Fever, chills or any sign of infection.
- Bruising without a knock, bleeding gums, nosebleeds, or blood in urine or stool.
- Sudden severe pain in one bone, especially after a minor knock — this needs imaging, not more pain relief.
- New leg weakness, numbness, or loss of bladder or bowel control — call 1800 202 8726 or go to the nearest emergency department.
Radiation safety at home
These isotopes release short-range radiation and clear largely through urine, so the people around you are not at risk when the written instructions are followed. Those instructions cover flushing, handwashing, cleaning spills, washing soiled clothing separately, and what to do if you use a catheter or have leakage. Our guide to side effects of radioisotope therapy goes further into what to expect week by week, and how many cycles of radioisotope therapy you may need covers repeat dosing.
What about cost?
A bone-seeking injection is quoted as a single treatment, but the bone scan, the blood tests before and after, the day-case charge at the nuclear medicine unit and any repeat dose are billed separately — so the first number you hear is rarely the total. Any figure you are given is indicative, as of August 2026, and it shifts with the centre, the isotope used and stock availability. Our page on the cost of theranostics and radioisotope therapy in India sets out what a proper itemised estimate should contain and what schemes and insurers typically do and do not cover.
Ask for a written, itemised estimate naming what is included before you agree to anything.
There is usually still something that can be done
One conversation tells you where you actually stand
Whether a bone-seeking injection fits your case or a short course of radiation makes more sense, you deserve a clear answer from a team that has managed widespread bone pain before.
Real Stories. Real Voices.
15,000+ patients chose CION. Hear from them directly.
These aren't paid endorsements or written reviews. These are video testimonials from real patients and families — recorded on their own phones, in their own words. Pick any one. Watch it. Then decide.
4.8★800+ Google reviews
50+video testimonials
15,000+patients treated
Read all 800+ reviews on Google
Start Your Story. Book Free Consultation.
Common questions
Samarium and strontium injections — your questions answered
How do samarium and strontium injections work for bone pain?
Bone that is being attacked by cancer tries to repair itself, and that repair activity draws in calcium-like minerals. Samarium-153 and strontium-89 behave chemically like calcium, so they follow that signal and collect in the bone deposits themselves. Once there, each isotope releases radiation over a very short distance, so the dose is concentrated in the deposit rather than in the tissue around it. Because the injection travels in the bloodstream, it reaches painful deposits all over the skeleton from a single dose, instead of one area at a time. The aim is to reduce pain, not to shrink cancer elsewhere in the body.
Who is suitable for a samarium or strontium injection?
It is generally considered for people whose pain is coming from several bone deposits at once rather than one site, where a bone scan shows those painful areas taking up the tracer, and where blood counts are strong enough to tolerate the dose. Kidney function has to be adequate, because unused isotope clears in urine. It is not the right answer for a single painful site, which is usually better treated with a short course of external beam radiation. It is also not used for pressure on the spinal cord or for a bone that is close to fracturing, because both of those need urgent local treatment first. The decision is made by your treating team from your own scans and blood tests.
How fast does pain relief start after the injection?
Not the same day. Among people who respond, the change is usually noticed somewhere between one and four weeks after the injection, and it tends to build rather than switch on. A minority feel a short-lived increase in bone pain in the first few days, often called a flare, before any improvement appears; this is expected, and it is managed by adjusting your existing pain medicines rather than stopping them. Where relief does come, it commonly lasts some months. Keep a simple daily pain score from the day of the injection, because that record is what your team uses to judge whether the injection worked and whether a repeat is worth considering.
Am I radioactive after a samarium or strontium injection?
Only mildly, and only for a short time. These are bone-seeking isotopes that release short-range radiation, so the risk to people around you is low and an isolation room is not usually required. The isotope that is not taken up by bone leaves in your urine over the first days, so your nuclear medicine team gives you written hygiene rules covering toilet use, flushing, handwashing, spills and laundry, plus extra instructions if you use a catheter or have leakage. These usually apply for a small number of days. Follow the written dates on your own instruction sheet rather than a general figure you read online, and ask the team to explain the sheet to whoever will be at home with you.
Can the injection be repeated if the pain comes back?
Sometimes, but it is never automatic. A repeat is considered only if the first injection clearly helped and only once your blood counts have recovered, which usually takes some weeks to a few months and is confirmed by a blood test rather than by the calendar. Your team also reweighs the whole picture at that point: how much marrow reserve you have left, what other treatment you are on, and whether external beam radiation to one dominant painful site would now serve you better. If the first injection did not help your pain, a second one of the same kind is usually not offered.
What does a samarium or strontium injection cost in India?
It is quoted as a single treatment rather than as a course, but the bone scan, the blood tests before and after, the day-case charge at the nuclear medicine unit and any repeat dose are billed separately, so the number you are first quoted is rarely the whole picture. Any figure you are given is indicative, as of August 2026, and it changes with the centre, the isotope used and stock availability. Ask for a written, itemised estimate naming exactly what is and is not included before you agree to anything, and check in the same conversation what your insurance or government scheme will cover.
This page is a general explainer about bone-seeking radioisotope injections, not medical advice and not a recommendation for your case. Only your treating oncology and nuclear medicine team, working from your own scans and blood tests, can say whether this treatment is an option for you.