Keratinocyte cancer diagnosis
The importance of early keratinocyte cancer diagnosis
Early diagnosis of keratinocyte cancer (NMSC) gives patients the strongest chance of successful treatment. The two most common forms, basal cell carcinoma (BCC) and squamous cell carcinoma (SCC), usually develop on areas of skin with long-term exposure to ultraviolet light.
When identified at an early stage, these types of keratinocyte cancer tend to remain local and respond well to straightforward treatment.
Quick recognition and referral can make a significant difference. When clinicians spot KC early, treatment often requires fewer procedures, causes less disruption to daily life and delivers excellent results.
Most localized tumours do not spread, which means patients can usually return to routine follow-up after treatment.
Delays in diagnosing keratinocyte cancer can complicate matters. A tumour that grows unchecked may invade deeper layers of the skin, increase the chance of spread to nearby structures and require more complex surgery.
How is keratinocyte cancer diagnosed?
If you suspect you may have non-melanoma skin cancer, this is what you can expect at your appointment with your healthcare professional.
The process
Diagnosing NMSC involves several steps that build from initial suspicion to confirmed diagnosis and treatment planning:
Initial presentation and clinical evaluation
Diagnosis usually begins when a person or their GP notices signs and symptoms of KC. This might be a sore that does not heal, a persistent scaly patch or a new lump. During the consultation, the GP considers the person’s medical history, risk factors such as previous sunburn or fair skin, and any recent changes in the lesion. The GP then examines the area and may use a dermatoscope, a magnifying tool that helps reveal surface structures. Clinical photos can also support assessment and monitoring.
Specialist referral and detailed skin assessment
If the GP suspects KC, they refer the patient to a dermatologist or skin cancer specialist. The specialist completes a full skin examination to check for additional lesions and to understand the overall state of the skin. They record the size, colour, texture and exact location of the lesion and may note features such as crusting, bleeding or irregular borders. Detailed photography often forms part of this assessment.
Biopsy and laboratory testing
A biopsy remains the only way to confirm keratinocyte cancer. The specialist removes either the whole lesion or a sample of it, depending on the size and location. Pathologists then study the tissue under a microscope to determine whether cancer is present. They also identify the cancer type and examine characteristics such as depth and margins, which help guide the choices of treatment for keratinocyte cancer.
Staging (if required)
Most BCCs do not require imaging because they rarely spread. Some SCCs, especially large or aggressive ones, may require extra tests. Clinicians might examine nearby lymph nodes or request imaging such as CT or MRI scans to check for deeper involvement or possible spread.
Multidisciplinary review and treatment planning
A multidisciplinary team usually reviews confirmed cases. This team may include dermatologists, surgeons, radiologists, pathologists and clinical nurse specialists. Together they consider factors such as tumour type, location, patient preferences and general health before agreeing on the most suitable treatment plan.
Main tests
Dermatoscopic examination
A dermatoscope helps specialists examine the lesion more closely. The tool reveals surface structures and blood-vessel patterns that support diagnostic decision-making and help identify which lesions need a biopsy.
A dermatoscope helps specialists examine the lesion more closely. The tool reveals surface structures and blood-vessel patterns that support diagnostic decision-making and help identify which lesions need a biopsy.
Skin biopsy
A biopsy provides the final diagnosis. It can be an excisional biopsy, an incisional or punch biopsy, or a shave biopsy. After removal, the tissue goes to a pathology laboratory for analysis.
A biopsy provides the final diagnosis. It can be an excisional biopsy, an incisional or punch biopsy, or a shave biopsy. After removal, the tissue goes to a pathology laboratory for analysis.
Additional imaging and tests
Clinicians may request further tests for high-risk cases. These might include ultrasound of lymph nodes or imaging scans such as CT or MRI to check for spread or deeper involvement. Blood tests are sometimes used to assess general health before treatment.
Clinicians may request further tests for high-risk cases. These might include ultrasound of lymph nodes or imaging scans such as CT or MRI to check for spread or deeper involvement. Blood tests are sometimes used to assess general health before treatment.
Full skin check and risk assessment
As part of the diagnostic process, specialists often examine the entire skin surface. This helps them identify any other lesions that may require attention, assess signs of chronic sun exposure and plan an appropriate follow-up schedule.
As part of the diagnostic process, specialists often examine the entire skin surface. This helps them identify any other lesions that may require attention, assess signs of chronic sun exposure and plan an appropriate follow-up schedule.
References
- Instituto Valenciano de Oncología (IVO). Skin cancer (non-melanoma) [Internet]. Valencia: IVO; [cited 2026 Jan 16]. Available from: https://www.ivo.es/en/el-cancer/tipos-de-cancer/skin-cancer-non-melanoma/
- NHS. Non-melanoma skin cancer: Tests and next steps [Internet]. London: National Health Service (NHS); [cited 2026 Jan 16]. Available from: https://www.nhs.uk/conditions/non-melanoma-skin-cancer/tests-and-next-steps/
- Clínica Universidad de Navarra. Skin cancer [Internet]. Pamplona: Cancer Center Clínica Universidad de Navarra; [cited 2026 Jan 16]. Available from: https://cancercenter.cun.es/en/all-about-cancer/cancer-types/skin-cancer
- Canadian Cancer Society. Diagnosis of non-melanoma skin cancer [Internet]. Canada: Canadian Cancer Society; [cited 2026 Jan 16]. Available from: https://cancer.ca/en/cancer-information/cancer-types/skin-non-melanoma/diagnosis