Sinonasal undifferentiated carcinoma (SNUC) and SWI/SNF-deficient sinonasal carcinoma: the decisions you may face
5 treatment settings, 5 with more than one named option. Each section lays out the options the standard of care names, what each is for, the trials behind them with their recorded results, the side effects and cautions on record, and questions to ask. Built from the cancer page's standard-of-care rows; nothing here is advice for your case.
Diagnosis
Biopsy with immunohistochemistry (cytokeratins, NUT, INI1, SMARCA4, neuroendocrine markers, EBER) and IDH2 testing; MRI and CT of the sinuses, skull base and neck; PET-CT.
Histopathology means looking at cancer cells under a microscope, and immunohistochemistry stains them for specific proteins. Together they are still the foundation of every diagnosis.
- Cheap, fast, universal
- Companion diagnostic for most targeted drugs
MRI uses a strong magnet and radio waves, with no ionising radiation, to picture soft tissue in finer contrast than CT, so it is the standard scan for brain tumours, prostate, rectal cancer staging, liver lesions and breast screening in high-risk women. It is slow, expensive and blurred by movement.
- No ionising radiation
- Best soft-tissue and brain imaging
- Functional sequences (diffusion, perfusion)
A CT scan is a fast 3D X-ray that shows the size and shape of tumours and whether they have spread.
- Fast, ubiquitous
- Sub-millimetre resolution
- Standard for RECIST response
PET and CT in one machine, so hot spots on the PET are pinned to exact locations on the CT.
- Anatomy plus biology
- Standard for lymphoma, lung, melanoma, head and neck staging
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
- Subjective scoring
- Single-site sampling misses heterogeneity
- Slow and expensive
- Motion artefacts
- Gadolinium concerns in renal impairment
- Anatomic only; cannot distinguish scar from live tumour
- Radiation dose
- Poor for brain, marrow, and small peritoneal disease
- CT radiation added to PET dose
- Between Histopathology & immunohistochemistry, MRI, CT (computed tomography) and the other options, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Head and Neck Cancers (ethmoid and maxillary sinus tumours)), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (diagnosis), which of the standard options do you recommend and why?Why: Guideline options include: Biopsy with immunohistochemistry (cytokeratins, NUT, INI1, SMARCA4, neuroendocrine markers, EBER) and IDH2 testing; MRI and CT of the sinuses, skull base and neck; PET-CT.
Add these to your appointment list, or take the full question set for this cancer.
Locally advanced disease, first step
Induction chemotherapy with cisplatin and etoposide (or docetaxel-platinum) for two to three cycles.
Cisplatin is the original platinum chemotherapy, discovered by accident in 1965; it cures testicular cancer and makes radiation work better in cervical and head and neck cancer.
Etoposide is a chemotherapy from the mayapple plant, essential to curing testicular cancer (BEP), treating small-cell lung cancer, lymphomas, childhood sarcomas and leukaemias, and used in transplant conditioning.
Platinum plus etoposide has been the chemotherapy backbone of small-cell lung cancer for over 40 years, and is now given with immunotherapy.
Cytotoxic chemotherapy drugs (platinums, antimetabolites, microtubule agents and topoisomerase inhibitors) kill rapidly dividing cells by damaging DNA or the mitotic spindle. They still cure testicular cancer, lymphoma and leukaemia, and they are the warhead inside antibody-drug conjugates, but a narrow margin between effective and toxic doses is their limitation.
- Curative in several cancers
- Cheap, generic
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
- Dose reduce or avoid for CrCl below 60 (carboplatin is the alternative).
- Reduce to 75% for CrCl 15-50.
- Narrow therapeutic index
- Resistance via efflux pumps and DNA repair
- Between Cisplatin, Etoposide, Platinum + etoposide (EP / CE) and the other options, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Head and Neck Cancers (ethmoid and maxillary sinus tumours)), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (locally advanced disease, first step), which of the standard options do you recommend and why?Why: Guideline options include: Induction chemotherapy with cisplatin and etoposide (or docetaxel-platinum) for two to three cycles.
- Am I a candidate for Cisplatin, Etoposide, Platinum + etoposide (EP / CE), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Add these to your appointment list, or take the full question set for this cancer.
Responders to induction
Definitive chemoradiotherapy with concurrent cisplatin (intensity-modulated or proton), including elective neck irradiation.
Cisplatin is the original platinum chemotherapy, discovered by accident in 1965; it cures testicular cancer and makes radiation work better in cervical and head and neck cancer.
IMRT and IGRT shape the radiation beam to the tumour's outline from multiple angles and check the patient's position with a scan before every session, so surrounding organs receive less dose. Fewer, larger doses are now standard in breast and prostate cancer, but a low-dose bath still spreads across normal tissue.
- Conformal dose, fewer side effects
- Hypofractionation saves visits
Radiation using protons, which stop inside the tumour instead of passing through, so tissue behind it gets no dose.
- No exit dose; lower integral dose
- Reduced second cancers in children
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
- Dose reduce or avoid for CrCl below 60 (carboplatin is the alternative).
- Low-dose bath to normal tissue
- Motion management
- Cost
- Range uncertainty
- Limited randomised evidence in adults
- Between Cisplatin, IMRT / IGRT (modern external beam) and Proton therapy, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Head and Neck Cancers (ethmoid and maxillary sinus tumours)), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (responders to induction), which of the standard options do you recommend and why?Why: Guideline options include: Definitive chemoradiotherapy with concurrent cisplatin (intensity-modulated or proton), including elective neck irradiation.
- Am I a candidate for Cisplatin, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Add these to your appointment list, or take the full question set for this cancer.
Non-responders to induction
Surgical resection where feasible followed by radiotherapy or chemoradiotherapy.
Surgeons operate through small incisions using robotic arms with tremor-free precision and 3D vision.
- Precision, shorter stay
- Enables complex minimally invasive resections
IMRT and IGRT shape the radiation beam to the tumour's outline from multiple angles and check the patient's position with a scan before every session, so surrounding organs receive less dose. Fewer, larger doses are now standard in breast and prostate cancer, but a low-dose bath still spreads across normal tissue.
- Conformal dose, fewer side effects
- Hypofractionation saves visits
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
- Cost
- Loss of haptic feedback
- Not superior for every indication
- Low-dose bath to normal tissue
- Motion management
- Between Robotic & minimally invasive surgery and IMRT / IGRT (modern external beam), which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Head and Neck Cancers (ethmoid and maxillary sinus tumours)), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (non-responders to induction), which of the standard options do you recommend and why?Why: Guideline options include: Surgical resection where feasible followed by radiotherapy or chemoradiotherapy.
Add these to your appointment list, or take the full question set for this cancer.
Metastatic or recurrent disease
Platinum-etoposide; PD-1 antibodies (pembrolizumab, nivolumab) on case series evidence; enasidenib for IDH2-mutant tumours in trials; EZH2 inhibitors for SWI/SNF-deficient carcinoma in trials.
Platinum plus etoposide has been the chemotherapy backbone of small-cell lung cancer for over 40 years, and is now given with immunotherapy.
Pembrolizumab is a PD-1 blocking antibody approved in more than 40 settings, from melanoma and lung cancer to the first tumour-agnostic approval for mismatch-repair-deficient tumours in 2017, and before and after surgery in triple-negative breast cancer. A subcutaneous form arrived in 2025, and it is the backbone partner for ADCs and personalised neoantigen vaccines.
Nivolumab was the second PD-1 blocker and is often combined with ipilimumab. Long-term data show about half of advanced melanoma patients alive at 10 years on the combination.
Enasidenib is the IDH2 counterpart of ivosidenib, approved in the US for relapsed disease but never approved in Europe after it failed to extend survival in a confirmatory trial.
Immune checkpoint inhibitors are antibodies against CTLA-4, PD-1 or PD-L1 that release the brakes on T cells so they attack the cancer. They are approved in more than 20 tumour types and produce lasting, sometimes curative responses that chemotherapy rarely does, but most patients do not respond and autoimmune side effects are the cost.
- Durable, sometimes curative responses
- Broad applicability
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
| Side effect | Any grade | Grade 3+ |
|---|---|---|
| Hypothyroidism (immune-mediated) · Pooled monotherapy data, >2,800 patients | 8% | - |
| Pneumonitis (immune-mediated) · Pooled monotherapy data, >2,800 patients | 3.4% | - |
| Colitis (immune-mediated) · Pooled monotherapy data, >2,800 patients | 1.7% | - |
| Hepatitis (immune-mediated) · Pooled monotherapy data, >2,800 patients | 0.7% | - |
- No pharmacokinetic interactions expected (antibody). See the irAE guide for toxicity management.
Rates from the label or pivotal trial as recorded on the product page; each grade 3+ figure links to its source.
| Side effect | Any grade | Grade 3+ |
|---|---|---|
| Colitis with ipilimumab (1+3 mg/kg) · Monotherapy pooled unless stated | 25% | 14.4% |
| Hepatitis with ipilimumab · Monotherapy pooled unless stated | 15% | 13.4% |
| Colitis · Monotherapy pooled unless stated | 2.9% | 1.7% |
| Hepatitis · Monotherapy pooled unless stated | 1.8% | 1.5% |
Rates from the label or pivotal trial as recorded on the product page; each grade 3+ figure links to its source.
| Side effect | Any grade | Grade 3+ |
|---|---|---|
| Differentiation syndrome | 14% | - |
Rates from the label or pivotal trial as recorded on the product page; each grade 3+ figure links to its source.
- Most patients do not respond
- Autoimmune toxicity
- Biomarkers are imperfect
- Between Platinum + etoposide (EP / CE), Pembrolizumab, Nivolumab and the other options, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- Which side effects of Pembrolizumab or Nivolumab are most likely for me, which are reversible, and which would make us stop?Why: The recorded rates below come from labels and trials; your own risk depends on dose, other medicines and your health.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Head and Neck Cancers (ethmoid and maxillary sinus tumours)), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (metastatic or recurrent disease), which of the standard options do you recommend and why?Why: Guideline options include: Platinum-etoposide; PD-1 antibodies (pembrolizumab, nivolumab) on case series evidence; enasidenib for IDH2-mutant tumours in trials; EZH2 inhibitors for SWI/SNF-deficient carcinoma in trials.
- Am I a candidate for Platinum + etoposide (EP / CE), Pembrolizumab, Nivolumab or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Add these to your appointment list, or take the full question set for this cancer.