TY - GEN
T1 - Keratinocyte carcinoma in Denmark
T2 - Trends, inequality and risk factors for unfavorable outcomes
AU - Krogh Holdam, Anne Sofie
PY - 2025/12/1
Y1 - 2025/12/1
N2 - Keratinocyte cancer (KC) is the collective term for basal cell carcinoma and squamous cell
carcinoma, which together are the most common forms of cancer in Denmark and represent
a significant burden on the healthcare system. This thesis uses epidemiological methods to
examine the increasing incidence, surgical treatment patterns, and inequality in disease
stage in relation to socioeconomic status during the period 2007–2021. It also examines
patients with early-onset KC and their risk of developing other early-onset cancers, as they
represent a distinct and potentially marginalized patient group.
Study I analyzed national trends in KC incidence from 2007 to 2021. Findings revealed a
steady increase in age-adjusted incidence rates for both basal cell carcinoma and squamous
cell carcinoma, with squamous cell carcinoma showing a particularly sharp rise in recent
years. While most tumors remained in early stages (T1), the number of locally advanced
tumors (≥T2) increased, highlighting growing demands on surgical services.
Study II assessed surgical treatment trends, showing that although surgical volume rose,
reconstructive procedures declined. Older patients and men were more likely to receive reconstructive surgery, while those with comorbidities or in assisted living were less likely to
undergo such procedures, suggesting treatment decisions are influenced by patient frailty.
In Study III, we found that locally advanced tumors (tumor stage ≥T2) were more common
among men, older individuals, people with lower levels of education and income, as well as
those living alone or in nursing homes. We also found regional differences in tumor stage,
suggesting inequality in access to specialized treatment.
Study IV focused on patients diagnosed with KC before the age of 40. These individuals
had a significantly higher risk of early-onset of other cancers, particularly melanoma. The
results support the need for improved patient information, and genetic counseling should be
considered more consistently for patients suspected of having a hereditary predisposition to
KC and other types of cancer.
In conclusion, this thesis examines several key challenges: the rising incidence of KC, the
complexity of surgical treatment, and persistent disparities in care. It underscores the importance of early detection, equitable access to specialized treatment, and personalized
care strategies, especially for vulnerable populations.
AB - Keratinocyte cancer (KC) is the collective term for basal cell carcinoma and squamous cell
carcinoma, which together are the most common forms of cancer in Denmark and represent
a significant burden on the healthcare system. This thesis uses epidemiological methods to
examine the increasing incidence, surgical treatment patterns, and inequality in disease
stage in relation to socioeconomic status during the period 2007–2021. It also examines
patients with early-onset KC and their risk of developing other early-onset cancers, as they
represent a distinct and potentially marginalized patient group.
Study I analyzed national trends in KC incidence from 2007 to 2021. Findings revealed a
steady increase in age-adjusted incidence rates for both basal cell carcinoma and squamous
cell carcinoma, with squamous cell carcinoma showing a particularly sharp rise in recent
years. While most tumors remained in early stages (T1), the number of locally advanced
tumors (≥T2) increased, highlighting growing demands on surgical services.
Study II assessed surgical treatment trends, showing that although surgical volume rose,
reconstructive procedures declined. Older patients and men were more likely to receive reconstructive surgery, while those with comorbidities or in assisted living were less likely to
undergo such procedures, suggesting treatment decisions are influenced by patient frailty.
In Study III, we found that locally advanced tumors (tumor stage ≥T2) were more common
among men, older individuals, people with lower levels of education and income, as well as
those living alone or in nursing homes. We also found regional differences in tumor stage,
suggesting inequality in access to specialized treatment.
Study IV focused on patients diagnosed with KC before the age of 40. These individuals
had a significantly higher risk of early-onset of other cancers, particularly melanoma. The
results support the need for improved patient information, and genetic counseling should be
considered more consistently for patients suspected of having a hereditary predisposition to
KC and other types of cancer.
In conclusion, this thesis examines several key challenges: the rising incidence of KC, the
complexity of surgical treatment, and persistent disparities in care. It underscores the importance of early detection, equitable access to specialized treatment, and personalized
care strategies, especially for vulnerable populations.
U2 - 10.21996/6ea065bd-1307-4280-98bf-863ac28e657c
DO - 10.21996/6ea065bd-1307-4280-98bf-863ac28e657c
M3 - Ph.D. thesis
PB - Syddansk Universitet. Det Sundhedsvidenskabelige Fakultet
ER -