CyberKnife for prostate cancer
CyberKnife treats prostate cancer with focused radiation and no cutting, typically in five sessions or fewer across about a week, rather than the daily hospital visits over seven or eight weeks that conventional radiotherapy needs. For men travelling from abroad, that difference in time is often the deciding factor.
- Sessions
- Usually five or fewer, over roughly a week
- Anaesthetic
- None for treatment. Light sedation for the marker placement beforehand
- What is treated
- The whole prostate gland in most cases, not just the visible tumour
- Also called
- Prostate SBRT, stereotactic body radiotherapy, robotic radiosurgery
- Best suited to
- Cancer still confined to the prostate, in low and intermediate risk groups
- Cost
- Depends on your case. Written estimate before you travel
Why the prostate is a particularly good target
The prostate sits close to the bladder and the rectum, and it moves. It shifts as the bladder fills and as the bowel moves, by several millimetres, which is a large distance when you are aiming radiation at it. Conventional radiotherapy handles this by treating a wider margin around the gland, which means more healthy tissue receives dose.
CyberKnife takes a different approach. Tiny gold markers, called fiducials, are placed in the prostate beforehand in a short procedure under light sedation. The robotic arm then watches those markers throughout treatment and corrects its aim in real time as the gland moves. That tracking is what allows a much tighter margin, and a tighter margin is what allows a high dose in very few sessions.
Five sessions instead of forty
This is the practical heart of it. Conventional external-beam radiotherapy for prostate cancer typically means attending hospital every weekday for seven to eight weeks. CyberKnife delivers a comparable biological dose in five sessions or fewer, spread over about a week, because each session carries a much higher dose.
If you live near the hospital, that is a convenience. If you are flying in from Nigeria, Kenya or Kazakhstan, it changes whether the treatment is feasible at all. A week of treatment fits inside a realistic trip. Two months of daily attendance usually does not, and it also makes the total cost of the trip considerably higher once accommodation is counted.
Who it suits, and who it does not
Often a good option
- Cancer confined to the prostate, low or intermediate risk
- Men who want to avoid surgery and general anaesthesia
- Men who cannot stay for weeks of daily radiotherapy
- Men not fit for an operation because of heart or lung conditions
- Some cases of cancer returning after earlier radiotherapy, treated cautiously
Usually not the answer
- Cancer that has spread to bones or distant organs
- A very large prostate, where dose to the bladder and rectum becomes too high
- Significant urinary obstruction or a very poor urinary flow already
- Inflammatory bowel disease affecting the rectum
- Cases where lymph nodes need treating over a wider area
Your PSA level, Gleason score and stage place you in a risk group, and that group decides whether CyberKnife alone is appropriate or whether hormone therapy should be added. This is not a judgement anyone can make from a website, and it is exactly what the consultation is for.
What happens, step by step
- Assessment. Your PSA history, biopsy report, Gleason score and scans are reviewed to confirm the cancer is confined to the gland.
- Fiducial markers placed. Three or four tiny gold markers are put into the prostate in a short day procedure under light sedation. This is the only part that involves any instrument.
- Planning scan. A CT, usually with MRI, maps the prostate and the nearby rectum and bladder precisely. A physicist and radiation oncologist build the dose plan over a few days.
- Treatment sessions. Five or fewer, each around 30 to 60 minutes, on consecutive or alternate days. You lie still; the robotic arm moves around you. You feel nothing.
- Straight home afterwards. No hospital stay, no recovery period. Most men carry on normally between sessions.
- PSA follow-up. Your PSA is tracked over the following months and years. This, not a scan, is the main measure of success.
Effects on urination and erections, discussed honestly
These are the two questions men actually want answered, and they deserve a straight response rather than reassurance.
Urinary effects are the most common. In the weeks after treatment many men experience a more urgent or frequent need to pass urine, sometimes with a burning sensation. This usually settles over one to three months. Because the high dose is delivered in few sessions, urinary symptoms can feel more pronounced in the short term than with conventional radiotherapy, while being no worse in the long run.
Erectile function can be affected, and this is worth understanding properly. Unlike surgery, where any change happens immediately, radiation effects appear gradually over months or years, because they arise from slow changes to small blood vessels and nerves. Many men keep useful function, particularly if it was good beforehand and they are younger. Some do not. Medication helps in many cases.
Bowel effects are less common with CyberKnife than with older techniques, precisely because tracking allows the rectum to be spared more effectively. A spacer gel is sometimes placed between the prostate and rectum to increase that margin further, and it is reasonable to ask whether that applies to you.
How it compares with surgery and brachytherapy
| CyberKnife | Surgery (prostatectomy) | |
|---|---|---|
| What happens | Focused radiation, nothing removed | The prostate is removed |
| Anaesthetic | None for treatment | General anaesthetic |
| Time commitment | About a week | Operation plus weeks of recovery |
| Urinary leakage | Uncommon | More common early, usually improves |
| Erectile change | Gradual, over months to years | Immediate, may recover partly |
| Follow-up measure | PSA should fall slowly over years | PSA should become undetectable |
Brachytherapy, where radioactive seeds are placed inside the prostate, is a third option with its own profile. For cancer confined to the gland, all of these can be effective, and none is universally best. They differ in the pattern of side effects, the time required and the recovery, which is why the choice should reflect both your cancer and your own priorities.
What it costs in India
The cost covers the marker placement, the planning imaging, the treatment sessions and follow-up, and it depends on your case. India is considerably less expensive than Western countries for CyberKnife. For an international patient there is a second saving that is easy to overlook: five sessions rather than forty means a far shorter stay, so accommodation and time away from work fall too. You receive a written estimate covering the whole plan before you commit, with no fee to us built in; the hospital pays us, so your bill is never marked up.
| Procedure | Indicative cost | Hospital stay |
|---|---|---|
| Stereotactic radiation (CyberKnife) | $5,700 | Outpatient, about a week |
| Radical prostatectomy, open | $7,000 | 7 days |
| Radical prostatectomy, robotic | $9,000–10,000 | 4–7 days |
| IMRT radiotherapy, full course | $3,000 | Outpatient, several weeks |
Questions men ask us
How many CyberKnife treatments will I need for prostate cancer?
Usually five or fewer, delivered over about a week. Some centres use three. This is the main practical advantage over conventional radiotherapy, which typically needs daily sessions for seven to eight weeks. Your radiation oncologist sets the exact number from your risk group and prostate size.
Does CyberKnife treat the whole prostate?
In most cases yes, the whole gland is treated rather than only the visible tumour, because prostate cancer is often present in more of the gland than imaging shows. Treating a part of the gland only is done in selected cases within careful protocols, and it is a specific question to raise with your specialist.
Does CyberKnife destroy the prostate?
No. The gland is not removed or destroyed; the radiation damages the cancer cells inside it so they stop dividing and die off. The prostate remains in place and usually shrinks somewhat over the following year. This is why your PSA falls gradually rather than dropping to zero as it does after surgery.
Will it cause erectile dysfunction?
It can, and you should hear that plainly. The change tends to be gradual over months or years rather than immediate, because it comes from slow effects on small blood vessels and nerves. Many men retain useful function, especially if it was good before treatment and they are younger, and medication helps in many cases. Ask your specialist for the risk in your specific situation rather than a general figure.
When is CyberKnife recommended for prostate cancer?
Most often when the cancer is still confined to the prostate and falls in a low or intermediate risk group, particularly for men who want to avoid surgery, cannot have a general anaesthetic, or cannot stay for weeks of daily radiotherapy. It is generally not the answer once the cancer has spread beyond the gland to bones or distant organs.
How will I know it worked?
By tracking your PSA over time. After radiation the PSA falls slowly over months and years rather than disappearing, and a small temporary rise, called a PSA bounce, can occur and does not necessarily mean failure. This is why follow-up PSA testing matters and why your specialist will want a schedule for it after you return home.
Does insurance cover it?
That depends entirely on your insurer and country. Some international policies cover treatment abroad, many do not, and some cover the procedure but not travel or accommodation. Ask your insurer in writing and use the hospital's written estimate, which carries the procedure detail they will need.
Is CyberKnife the same as SBRT?
CyberKnife is one way of delivering SBRT, stereotactic body radiotherapy. Other machines can deliver prostate SBRT too. What distinguishes CyberKnife is the robotic arm and the real-time tracking of implanted markers as the prostate moves. The underlying principle, a high dose in very few sessions, is the same.
Related
- CyberKnife in India: the full picture, including other cancers
- Prostate cancer treatment in India: all the options compared
- CyberKnife compared with Gamma Knife
- Radiation therapy in India
- Medical visa for India