rejuvenation

Hormone treatments, chemotherapy that stops the ovaries and long courses of steroids all thin the bones, fast enough to measure within a year. Some of it comes back when the treatment stops, and the drugs that prevent fracture while it is going on are well proven.

New bowel symptoms after radiotherapy to the prostate, cervix, womb, bladder or rectum are common and are often treated as something to live with. They usually have several separate and treatable causes, and a trial showed that working through them with a written algorithm, delivered by a nurse or a gastroenterologist, improved symptoms more than a self-help booklet.

Chemotherapy and radiotherapy do not select blood stem cells at random. They favour the ones carrying mutations in DNA-damage genes, which then expand. Most people with such a clone never develop a blood cancer, but the clone is a measurable mark of what treatment did, and in a minority it is the seed of a later leukaemia.

Pellets of compounded oestrogen and testosterone are implanted under the skin and sold as a way to feel young again. The National Academies reviewed the evidence and told prescribers to restrict their use: the claim that compounded preparations are safer or more effective than approved hormone products is not supported, and nobody checks what is in them.

Radiotherapy to the head and neck damages the salivary glands and, through the dry mouth that follows, the teeth. Planning that steers dose away from the parotid glands roughly halves lasting dryness and lets saliva recover over a year or two. Teeth need a dental assessment before treatment starts, because extractions afterwards risk the jawbone failing to heal.

An epigenetic clock reads chemical marks on DNA and estimates how old the body looks, which is not always the age on a birth certificate. In survivors of childhood cancer the clock runs ahead of chronological age, and the gap is larger after radiotherapy and after certain chemotherapy drugs. What the gap means for any one person is not yet known, and the clocks do not agree with each other.

Exosomes are real biology and a serious research field. Exosome injections sold in clinics are neither. There are no approved exosome products anywhere, and the FDA issued a public safety notification after patients in Nebraska were seriously harmed by them.

Taking fat from one part of the body and injecting it to fill a defect left by surgery is routine reconstructive practice. The question survivors ask is whether it wakes anything up. Matched studies have not found higher recurrence, but they are not randomised trials, and the grafted area can produce changes on a mammogram that need to be told apart from a recurrence.

Fatigue is the commonest thing left behind by cancer treatment and the least treated: about a third of women in two large breast cancer cohorts still had severe fatigue years after diagnosis. What works is exercise, cognitive behavioural therapy and mindfulness programmes. What does not is the stimulant tablet people most often ask for, and the 2024 guideline says so.

The clearest evidence that treatment ages people is not a laboratory marker, it is what happens to survivors decades later. In the St Jude Lifetime Cohort, one in eight women who had cancer as a child met the clinical definition of frailty at a mean age of 33, a rate usually seen after 65. Frailty predicted new chronic conditions and death.

Cisplatin kills the hair cells of the inner ear, starting at the high frequencies, and the loss does not come back. In children, sodium thiosulfate given six hours after each dose cut hearing loss from 63 to 33 per cent in one randomised trial and from 56.4 to 28.6 per cent in another. Nothing equivalent is licensed for adults.

Most heart damage from anthracycline chemotherapy appears within the first year after it finishes, and most of it improves at least partly when it is caught and treated. Heart muscle weakened by trastuzumab usually recovers when the drug is stopped. Radiotherapy to the chest raises the risk of coronary disease years later, in proportion to the dose the heart received.

Hyperbaric oxygen has real randomised evidence for a short list of late radiation injuries, and none at all for the general claims made for it in wellness clinics. The distinction is worth holding, because the clinics use the real indications to sell the invented ones.

An NAD+ drip takes several hours, is sold in courses, and has never been tested against placebo for anything a cancer survivor would recognise. The published human literature on intravenous NAD+ amounts to retrospective series and narrative reviews.

Two things have changed. Measuring the limb regularly after surgery, so that a month of compression can start before swelling is obvious, cut progression to full decongestive treatment from 19.2 to 7.9 per cent in a randomised trial. And joining lymphatics to small veins during the node operation cut new lymphoedema from 32 to 9.5 per cent, in a trial not yet finally reported.

Treatment can bring on menopause in a week rather than a decade, and the usual answer, hormone replacement, is often unavailable. The non-hormonal options now have real trial evidence: elinzanetant cut moderate to severe hot flushes by three and a half episodes a day more than placebo in women on endocrine therapy, and venlafaxine and oxybutynin also beat placebo.

There is one licensed mesenchymal cell product in oncology and it is for one narrow use: children whose graft-versus-host disease has not responded to steroids. Everything else sold as a mesenchymal or stromal cell infusion for repair or rejuvenation is unlicensed and untested, and it is worth knowing the difference because the clinics rely on it being blurred.

Metformin is cheap, old and safe enough that it is the obvious candidate for a drug that slows ageing. The largest cancer trial ever run on it, in 3,649 women with breast cancer, found nothing. The trial designed to test whether it slows ageing itself has not been run.

Muscle lost during treatment is usually regained with resistance training and enough protein, over months rather than weeks. Muscle lost to cancer cachexia is different: while the cancer is active, training and food slow the loss but rarely reverse it, and the consensus definition says so plainly.

NAD+ falls with age, and swallowing a precursor raises it in the blood. That much is established. Whether raising it does anything for a person who has had cancer is not. The one B3 compound with a real cancer result is plain nicotinamide, for preventing skin cancers in people who keep getting them, which is a different claim entirely.

Taxanes lift the nail from its bed, leave transverse ridges that mark each cycle, and discolour it. Reported rates across studies range from none to forty-four per cent. Cooling the hands during the infusion reduced nail damage in a pooled analysis, but the one properly randomised trial was negative and six in ten participants stopped because the cold was too uncomfortable.

Numbness, tingling and pain in the hands and feet are common on platinum, taxane, vinca and proteasome-inhibitor treatment, and most of it fades. In a meta-analysis of 4,179 patients it was present in 68 per cent in the first month, 60 per cent at three months and 30 per cent at six months or later. Only duloxetine has evidence for the pain, and no drug prevents it.

Whether periods return after chemotherapy depends mostly on age and on which drugs were given. In the one study that recorded bleeding daily, about two thirds of women who stopped bleeding for six months after an anthracycline regimen started again, usually within a year. Of those who went two years without a period, one in ten bled again and none regained regular cycles.

Ozone is sold to survivors as an infusion of ozonated blood, a rectal insufflation or an injection, for immunity, energy and detoxification. The United States regulation on the subject opens with a sentence worth reading in full: "Ozone is a toxic gas with no known useful medical application in specific, adjunctive, or preventive therapy."

Platelet-rich plasma is the person's own blood, spun down and injected back. It is sold for hair, skin and vaginal dryness after treatment. The two trials that have actually been run in cancer survivors are small, and the better designed of the two found no difference between the treated and untreated side of the same scalp.

Dexrazoxane, given with the chemotherapy, cuts clinical heart failure in adults by about four fifths in pooled trials without reducing how well the chemotherapy works. Beta blockers and blood-pressure drugs given preventively protect the ejection fraction by a point or two during treatment, and in the one trial that followed patients for two years that difference had gone.

Rapamycin extends life in every species it has been properly tested in, which is why people take it off-label. In humans there are two randomised results worth knowing: a related drug improved the flu vaccine response in older people by about a fifth, and a year of low-dose rapamycin in healthy adults did not change its primary endpoint. That is the whole of it.

Chemotherapy, a transplant and CAR-T empty out the immune system, and rebuilding it takes months to years. Blood counts come back before protection does: the antibodies built up over a lifetime, from childhood jabs and from infections, are largely lost after a transplant. Re-vaccination puts them back, on a published schedule.

A surface electrical device that is said to replace pain signals with signals the brain reads as normal. People treated with it often feel better, but in the only trial that compared it with a dummy device there was no difference between the two, so what is being felt may be the attention and the expectation rather than the machine.

Chemotherapy pushes cells into senescence: they stop dividing but stay alive and keep releasing inflammatory signals. The usual marker, p16INK4a in blood T cells, rises sharply during treatment and is still raised a year later. In one study the rise matched about fifteen years of ordinary ageing, in another the gap in survivors was larger still.

Senolytics are drugs meant to kill the worn-out cells that chemotherapy leaves behind. The idea is good and the animal work is striking. The human evidence is four small trials in other diseases, none in cancer survivors, and the one properly randomised trial missed its main target. Nobody should be buying these.

Sexual difficulty is among the losses people report most after cancer treatment and among the least often asked about. The guideline says a member of the care team should raise it, and that counselling should be offered to everyone. The treatments are real but modest, and the clearest finding is that a tablet taken only when needed does not restore erections after prostate surgery.

Skin reactions in the treated area peak around the end of radiotherapy and heal. A thin silicone film applied from the first day cut moderate or severe reactions from 45.6 to 15.5 per cent in a randomised trial in breast cancer, and an international guideline recommends it. Permanent changes, such as fine broken veins and firmness, come later and do not reverse.

Clinics at home and abroad sell stem cell infusions and injections to people finishing cancer treatment. The FDA has recorded blindness, tumour formation and infections from these products, and says plainly that if you are being charged for one outside a clinical trial you are likely being deceived. Two of the harms are written up in the New England Journal of Medicine.

Telomeres are the caps on chromosomes that shorten each time a cell divides. They are the oldest and best known measure of cellular ageing, and the one with the least to show for itself in cancer survivors so far: the measurements exist, the associations are inconsistent, and nothing follows from a result.

Low testosterone is common after cancer treatment and is rarely looked for: it was present in 38.5 per cent of 491 men treated for testicular cancer, in about half of a separate cohort whether or not they had chemotherapy, and in a third of adults given cranial radiotherapy. Replacement is straightforward where it is indicated; men with a prostate cancer history are the uncertain group.

Exercise is the best-evidenced thing a person can do for their own recovery, and the guidelines put a number on it: moderate aerobic exercise at least three times a week for at least thirty minutes, for eight to twelve weeks, plus resistance training twice a week, two sets of eight to fifteen repetitions at sixty per cent or more of the heaviest weight you can lift once.

Trouble with memory, concentration and word-finding after chemotherapy is real and measurable, and what a person reports and what a test shows often do not match. Cognitive rehabilitation is the approach with the best trial evidence, exercise helps on some measures and not others, and every drug tried so far has failed, including a large trial of donepezil.

BPC-157, ipamorelin, thymosin, CJC-1295 and the rest are sold online and by clinics for healing, energy and recovery after treatment. The FDA has placed several of them on the list of substances that may present significant safety risks in compounding, and names immunogenicity, impurities and, for some, deaths in studies.

Vaginal dryness and painful sex after cancer treatment are common, lasting and under-treated. Low-dose vaginal oestrogen is the usual answer outside cancer, and for women on an aromatase inhibitor the guidance disagrees: American and British bodies read the same cohort studies differently. A reader deserves to be told that rather than given one confident answer.

Exercise, sleep, not smoking, treating what is treatable and keeping up surveillance outperform everything currently sold as rejuvenation, by a wide margin and with randomised trials behind them. The measurable ageing that treatment causes is real and is a reason for research, not a reason to buy something.