What is de sanctis-cacchione syndrome? 

De Sanctis-Cacchione Syndrome (DSCS) is a very rare and severe form of xeroderma pigmentosum (XP). Xeroderma pigmentosum can be broken down into its Latin meaning for better understanding: 

• Xero → dry
• Derma → skin
• Pigmentosum → pigmented/coloured

Together, it translates to dry pigmented skin. It was named this way because early doctors observed patients developing dry, freckled and darkly pigmented patches on sun-exposed skin. 

But this is just one aspect of DSCS. XP is a group of rare inherited disorders in which the body is unable to properly repair damaged DNA. Because DNA provides the instructions for making proteins (which are the molecules that keep our cells and organs working), this repair failure has serious consequences on everyday bodily function. 

Symptoms

DSCS affects many parts of the body, and people with the condition often suffer from:¹ 

• Extreme photosensitivity – sensitivity to sunlight where even minor exposure to ultraviolet (UV) light can cause severe skin problems, rashes and even early skin cancers. This photosensitivity can also affect the eyes 
• Microcephaly – this is where an individual develops a smaller-than-average head size, which is linked with brain development issues 
• Neurological impairments – mental retardation, difficulty coordinating voluntary movement, muscle stiffness (spasticity), reduced reflexes 
• Late development – some individuals remain of an unusually short stature, and puberty can also be delayed or underdeveloped because of hormone-related problems 

DSCS can be a very challenging condition to navigate, and so it can provide comfort and reassurance to families to understand what each specialist contributes to the management of the condition and how they can be supported. 

Why multidisciplinary care matters 

Because DSCS affects the skin and nervous system, care and management require a multidisciplinary approach involving dermatologists to manage skin damage and cancers, neurologists to monitor and support individuals experiencing neurological decline and clinical geneticists and genetic counsellors. A team-based approach not only allows for a more accurate diagnosis but also leads to better treatment planning and, ultimately, an improved quality of life for individuals living with the condition. Additionally, early intervention and protecting against sunlight can play an important role in slowing down the development of neurological symptoms.¹ 

Dermatology: protecting the skin 

Individuals with DSCS develop serious skin problems because their bodies cannot repair damage caused by UV rays. Even a small amount of UV exposure can lead to extreme sun sensitivity, resulting in skin lesions and lots of pain. This can leave behind pigmentation changes and freckles in sun-exposed areas. Additionally, they can also present with early skin cancers. 

Dermatologists are crucial to the management of DSCS. In particular, they play an essential role in early diagnosis. They also advise strict sun protection, including special protective clothing, sunglasses, and broad-spectrum sunscreens with added skin emollients to prevent dryness and irritation.² 

Regular checkups with dermatologists every three to six months are also important for the removal of precancers and early management of skin cancers.³ 

Skin protection advised by dermatologists is also a way to help children live longer and safer lives, and minimise the discomfort caused. 

Neurology: looking after the brain and nervous system

Neurologists are also crucial in the management of DSCS. The role of neurologists includes: 

• Monitoring brain function and cognitive impairments
• Prescribing treatments to control seizures or muscle stiffness
• Referrals to physical, occupational and speech therapy

Although neurologists cannot stop the DNA damage itself, they can provide therapies and support to help manage neurological impairments. The monitoring of neurological decline is particularly important. A long-term NIH study following 106 patients with XP over 39 years found that about one in four (24%) developed progressive neurological decline.⁴ Additionally, the age at which symptoms first appear and the extent of neurological decline are closely linked to how severely the body’s DNA repair system is impaired.² This means that children with the greatest repair problems often develop symptoms earlier and experience faster progression. Monitoring cognitive decline over the years helps doctors track how the disease is progressing, adjust therapies to support learning and daily functioning, and provide families with guidance for long-term care planning. Additionally, referrals to occupational therapy can help children and families manage everyday challenges from improving fine motor skills needed for writing or self-care to adapting the home and school environment with practical strategies and tools that make daily life easier.

Genetics: understanding the root cause 

DSCS is linked to mutations in the XPA and XPD genes, which, in normal functioning, play a vital role in repairing DNA damage. These genes produce proteins that are essential for a process called nucleotide excision repair (NER), which is the body’s main system for fixing damage to DNA. Both XPA and XPD have different involvement in this process and have different implications for one's health. Genetic sequencing can confirm the diagnosis and also identify the exact genetic cause and XP mutated group.¹ Not only does it confirm the diagnosis, but it also helps families understand how the condition was inherited and what the chances are of it occurring in future children. This information provides clarity and support for parents. They can also provide genetic counselling for future pregnancies. 

A multidisciplinary approach

Due to DSCS affecting different parts of the body, no single doctor can manage it alone. The best outcomes come from a multidisciplinary approach, where dermatologists, neurologists and geneticists work closely together to support the affected individual and their family. 

Regular check-ups are essential. Dermatologists monitor skin lesions and conditions every few months to remove any pre-cancerous spots and update sun protection strategies. Neurologists monitor brain and nerve function, adjusting therapies for seizures, stiffness or learning difficulties and implementing physical or occupational therapy as needed.¹ Geneticists can confirm the diagnosis, explain inheritance and provide counselling to guide family planning. By sharing medical information and coordinating care, these specialists can create a personalised care plan tailored to the specific needs of each individual. 

At the centre of this team are the families themselves. Parents are not only involved in the caregiving but also play key roles in the decision-making process, helping ensure that the care plans fit appropriately with everyday routines. Affected families also benefit from support and practical guidance. 

The multidisciplinary approach provides a safety net for the affected individual, with each specialist playing a key role. Medical information and updates need to be communicated consistently throughout the team. With coordinated care, children with DSCS can live safer, more comfortable lives, and families can feel supported in navigating the challenges associated with this rare condition. 

Challenges and moving forward

There is currently no cure for DSCS. Alongside this, access to specialists is limited, which can take an emotional toll on families.⁵ With such a rare disease, families may understandably feel overwhelmed or hopeless at times. However, there are ongoing investigations into new skin-targeted treatments such as photoprotection.⁶ The aim is to repair DNA damage after it happens. Normally, UV rays create little “breaks” or errors in the DNA of skin cells. The idea is to deliver a special repair enzyme directly into the skin, packaged inside tiny fat bubbles called liposomes, which can slip into cells. Once inside, the enzyme can find and fix the DNA errors caused by UV light.⁷

Collaboration across specialities is already making care more effective for patients and families, while also paving the way for future breakthroughs in treatment. 

Summary

• DSCS is the most severe form of xeroderma pigmentosum, caused by mutations in DNA repair genes like XPA and XPD
• DSCS leads to extreme sun sensitivity, early skin cancers, and progressive neurological decline, along with growth and developmental problems
• Multidisciplinary care is essential, with dermatologists, neurologists, and geneticists working together to provide diagnosis, monitoring, and supportive therapies
• Families are central to care, supported by regular check-ups, coordinated communication between specialists, and access to advocacy and social services
• While no cure currently exists, early intervention, strict sun protection, and ongoing research into DNA repair give hope for improved outcomes and future treatment