Patients with rare skin cancer face 40% recurrence rate

Date:
February 23, 2022
Source:
University of Washington School of Medicine/UW Medicine
Summary:
Patients treated for Merkel cell carcinoma (MCC) face a five-year
recurrence rate of 40% -- markedly higher than the recurrence
rates for melanoma and other skin cancers. Additionally, in the
study cohort of more than 600 patients, 95% of MCC recurrences
happened in the first three years, suggesting that surveillance
efforts should be focused on that span.



FULL STORY ========================================================================== Patients treated for Merkel cell carcinoma (MCC) face a five-year
recurrence rate of 40% -- markedly higher than the recurrence rates for melanoma and other skin cancers, according to research published today
in JAMA Dermatology.


========================================================================== Additionally, in the study cohort of more than 600 patients, 95% of
MCC recurrences happened in the first three years, suggesting that
surveillance efforts should be focused on that span the authors wrote.

"Merkel cell cancer is a life-changing diagnosis. It can be
time-consuming, costly and exhausting to undergo clinic visits, imaging
studies and blood draws. Now we have data on the time intervals and
cancer stages that merit higher or lower surveillance intensity," said
Dr. Aubriana McEvoy, who led the research while she was at the University
of Washington School of Medicine. She is currently a dermatology resident
at Washington University in St. Louis.

Merkel cell cancer is a rare, aggressive skin cancer, more often fatal
than invasive melanoma and basal-cell and squamous-cell carcinomas. Merkel
cell carcinoma is composed of cells that look very similar to 'Merkel'
cells that are a key part of the epidermis, the skin's outer layer. Normal Merkel cells communicate touch-related information such as pressure and
texture to the brain.

This study comprised 618 patients (37% female) whose ages ranged from
11 to 98 and whose median age was 69. In this cohort, initial treatment (surgery, radiation and systemic therapy) had a median duration of
90 days.

The authors sought to characterize post-treatment recurrence risk of
MCC diagnosed at pathologic (listed below) and clinical stages.



==========================================================================
Risk of recurrence at one year was found to be:
* 11% among patients diagnosed with stage I disease * 33% among
patients diagnosed with stages IIA/IIB disease * 30% among patients
diagnosed with stages IIIA disease * 45% among patients diagnosed
with stage IIIB disease * 58% among patients diagnosed with stage
IV disease
The investigators found four factors associated with higher recurrence
risk: advanced age, male sex, immunosuppression, and a known primary
lesion amid clinically detectable nodal disease.

As expected, survival among cohort patients was strongly dependent on
cancer stage at time of diagnosis: The MCC-specific survival rate at five
years post- treatment was 95% for patients diagnosed at stage I vs. 41%
for patients diagnosed at stage IV.

MCC survival "is a more accurate measure of disease risk than overall survival," the authors wrote, because patients, with a median age of 70 at diagnosis, are at "considerable" risk of death from conditions unrelated
to cancer. Again, stage at diagnosis was associated with a meaningful difference: 90% of deaths among patients with stage IV disease were
attributed to MCC, whereas just 57% of deaths among patients diagnosed
at stage I were attributed to the disease.

"This is a tricky cancer to beat because it comes back -- after optimal
therapy in almost half of patients. We want to help patients figure out
how much remaining risk of recurrence they have at various times after diagnosis," said Dr. Paul Nghiem, chair of dermatology at the UW School
of Medicine. He is the study's senior author and an expert on Merkel
cell cancer.



==========================================================================
He added that the UW's database is likely the most comprehensive anywhere
for MCC case therapies and outcomes.

"These are all patients who were followed meticulously to know why
they're doing well or not doing well. The size of the data set has
allowed us to see patterns more clearly, and we need data to drive
optimal decision-making," Nghiem said.

U.S. incidence of MCC is low relative to other skin cancers, but also is
on a steep upward trajectory because the disease is closely associated
with age.

About 3,200 cases will be diagnosed this year, according to a 2018 study
by Nghiem and colleagues.

By contrast, about 100,000 new melanomas will be diagnosed this
year. Basal cell carcinoma is far more common, with 3.6 million cases
diagnosed annually, and squamous cell carcinoma numbers 1.8 million new
cases a year, according to the Skin Cancer Foundation.

Each of these cancers has a significantly lower post-treatment recurrence
rate than MCC, the authors noted: melanoma 19%, squamous cell 5-9%,
basal cell 1-2%.

This research was supported by funding from the National Institutes
of Health/ National Cancer Institute (P01 CA225517 and Cancer Center
Support Grant P30 CA015704), the MCC Patient Gift Fund, and the Kelsey
Dickson Team Science Courage Research Team Award from the Prostate
Cancer Foundation.

========================================================================== Story Source: Materials provided by University_of_Washington_School_of_Medicine/UW_Medicine.

Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Aubriana M. McEvoy, Kristina Lachance, Daniel S. Hippe, Kelsey
Cahill,
Yasman Moshiri, Christopher W. Lewis, Neha Singh, Song Y. Park,
Zoe Thuesmunn, Maclean M. Cook, Nora A. Alexander, Lauren Zawacki,
Hannah Thomas, Kelly G. Paulson, Paul Nghiem. Recurrence
and Mortality Risk of Merkel Cell Carcinoma by Cancer
Stage and Time From Diagnosis. JAMA Dermatology, 2022; DOI:
10.1001/jamadermatol.2021.6096 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/02/220223111226.htm

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