Adenocarcinoma of the Skin (Tumor Arising from Glandular Tissue of the Skin) in Dogs
- Occurrence: rarer
- Location of disease: Skin/Fur
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
CutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinoma is a malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. that arises from the glandular structures of the skin. These malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. neoplasms can originate from various gland types, including sebaceous, sweat, or apocrine glands. Unlike benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. adenomas, adenocarcinomas exhibit an invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. growth pattern and the potential to metastasize. Histologically, these tumors are characterized by atypical glandular cells that disrupt the normal tissue architecture and can infiltrate the surrounding tissue.
The most important facts at a glance
Cutaneous adenocarcinoma in dogs is a malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. that arises from the glandular structures of the skin and accounts for approximately 2–6% of all cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. neoplasms. These tumors occur predominantly in older dogs and show a certain breed predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases.. The etiology is multifactorialMultifactorial refers to conditions or diseases that arise from the interplay of several causes or risk factors. In dogs and cats, these can be genetic predispositions, environmental influences, and nutritional factors that together lead to health problems., with genetic factors, environmental influences, and chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammatory processes playing a role.
Clinically, adenocarcinomas present as progressively growing, firm nodules that can ulcerate in advanced stages. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made through a combination of clinical examination, cytological and histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination, and imaging procedures for stagingStaging is the process of determining the extent of a disease's spread, especially in cancer. It helps classify the severity of the condition and plan an appropriate treatment strategy..
The therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. of choice is wide surgical excision with tumor-free resection margins. In cases of incomplete resection or high-grade malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumors, adjuvant therapies such as radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. or, in selected cases, chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. may be indicated. Newer therapeutic approaches such as electrochemotherapy, targeted therapies, and immunotherapeutic procedures expand the therapeutic spectrum.
The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. depends significantly on the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. stage, histological grade, and completeness of surgical resection. Structured follow-up care with regular clinical examinations and imaging studies is essential to detect recurrence or metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. early.
The early detection of Skin changes by the owner and prompt veterinary clarification are crucial for an optimal treatment outcome. Owners should therefore be instructed to perform regular skin examinations on their dog and have changes clarified by a veterinarian immediately.
Causes
Cutaneous adenocarcinomas account for approximately 2–6% of all cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. neoplasms in dogs and are among the rarer skin tumors. They occur predominantly in older dogs, with the average age of onset around 10–12 years. Certain breeds such as Cocker Spaniels, Poodles, and Labrador Retrievers appear to have a certain predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases., suggesting genetic factors. The biological significance of these tumors lies in their locally aggressive behavior and ability to metastasize to lymph nodes and distant organs, making them a serious oncological condition.
The etiologyEtiology is the study of the causes and origins of diseases. It deals with the factors that contribute to the emergence and development of pathological conditions. of cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinomas is multifactorialMultifactorial refers to conditions or diseases that arise from the interplay of several causes or risk factors. In dogs and cats, these can be genetic predispositions, environmental influences, and nutritional factors that together lead to health problems. and not fully understood. Scientific evidence suggests an interplay of various factors:
Genetic predispositions play an important role, as evidenced by the increased occurrence in certain dog breeds. Molecular genetic studies have identified specific genetic alterations, including mutations in tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. suppressor genes and oncogenes, which can contribute to the malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. transformation of glandular cells.
Environmental factors such as chronic UV exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. can contribute to carcinogenesis, particularly in thinly haired or unpigmented skin areas. Long-term exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to chemical carcinogens in the environment is also discussed as a possible risk factor.
A particularly important pathogenetic mechanism is the connection between chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammatory processes and tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. development. PersistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. skin inflammation can impair DNADNA (deoxyribonucleic acid) is the molecule that carries the genetic instructions for the development, function, and reproduction of all known living organisms and many viruses. It is located in the cells of an organism and contains the information for heredity. repair mechanisms and promote malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. transformation through continuous tissue damage, oxidative stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., and the release of inflammatory mediators. This explains why non-healing skin inflammation can pose an increased risk for the development of adenocarcinomas.
Hormonal factors are also discussed as possible influencing factors, especially for tumors arising from hormone-dependent glandular structures. However, the evidence for this is less clear in cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinoma than in other tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. types.
Symptoms
The clinical presentation of cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinomas can vary but shows characteristic features that may be recognizable to pet owners. Typically, these tumors manifest as solitary, firm nodules in the skin or subcutaneousSubcutaneous means “under the skin.” In medicine, it refers to the administration of drugs or the placement of implants directly under the skin. tissue. The size can range from a few millimeters to several centimeters, with larger tumors often having an irregular surface.
A significant clinical feature is the growth behavior: adenocarcinomas often show progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. growth over weeks to months. In advanced stages, the tumors can ulcerate, leading to bleeding, secretion, and secondary bacterial infections. These complications manifest through oozing, unpleasant odor, and pain at the affected site.
Affected dogs often show increased licking or scratching at the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. site, indicating local itching or discomfort. In tumors in mechanically stressed areas such as the paws or joint regions, lameness or movement restrictions may occur.
In advanced disease with metastasisA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body., systemic symptoms may occur, including lethargy, inappetence, weight loss, and, depending on the location of metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body., organ-specific symptoms. Enlarged regional lymph nodes may indicate lymphogenic metastasisA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. and should always be carefully palpated.
Particularly problematic are adenocarcinomas that develop from chronic, non-healing inflammatory foci. Here, the transition from chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. dermatitis to a malignantMalignant means “cancerous” and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. process can be difficult for the owner to recognize, which underscores the importance of regular veterinary examinations for persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. skin changes.
Diagnosis
- BiopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. of the lesion for histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination.
- Imaging procedures such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., X-ray, or CT to assess spread.
The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinoma requires a systematic approach that combines clinical, cytological, histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats., and imaging procedures. The diagnostic algorithm begins with a thorough clinical examination, in which the size, consistency, mobility, and demarcation of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. as well as the condition of the regional lymph nodes are assessed.
Cytological examination by fine-needle aspirationFine-needle aspiration is a minimally invasive diagnostic technique that uses a thin needle to extract cells or fluid from a tumor, lesion, or organ. This sample is then examined microscopically to make a diagnosis. represents an important first diagnostic step. Cells are taken from the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. and examined microscopically. Characteristic cytological findings in adenocarcinomas are cell clusters with clear signs of cellularCellular refers to cells or consisting of cells. In biology and medicine, it refers to processes, structures, or functions that occur at the level of individual cells. atypia, anisocytosis, anisokaryosis, and prominent nucleoli. Cytologycytology is the study of cells, their structure, function, and chemistry. In medicine, it often refers to examining cells under a microscope for diagnosis of diseases. can provide valuable clues but is not always sufficient for definitive diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients..
The gold standard for diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination of a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions.. This can be performed as an incisional biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. (removal of a piece of tissue) or as an excisional biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. (complete removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.). HistopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination not only enables the definitive diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of an adenocarcinoma but also the determination of the histological subtype, degree of differentiation, and invasiveness, which is crucial for prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. and treatment planning.
Modern diagnostic procedures also include immunohistochemical examinations, which can confirm the epithelial origin of the tumor through specific markers such as cytokeratins. For certain subtypes, specific markers such as estrogenEstrogen is a group of steroid hormones that are primarily responsible in female animals for regulating the reproductive system and developing female characteristics. In dogs and cats, estrogens play an important role in the estrous cycle. or progesterone receptors can provide additional prognostic information.
Imaging procedures are essential for assessing tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. stage and ruling out metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body.. These include:
- Chest X-rays in three views to rule out pulmonaryPulmonary refers to the lungs or the respiratory system. Pulmonary diseases in dogs and cats include conditions such as Pneumonia, asthma, and pulmonary hypertension. metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body.
- AbdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. to assess abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. organs and lymph nodes
- In complex cases, advanced imaging procedures such as computed tomography (CT)Computed tomography (CT) is an imaging technique that uses X-rays and computer technology to create cross-sectional images of the body. It enables a detailed view of bones, organs, and other structures and is used for the diagnosis of injuries, diseases, and for planning medical interventions. or magnetic resonance imaging (MRI)Magnetic resonance imaging is an imaging technique that uses strong magnetic fields and radio waves to create detailed images of the inside of the body. It is used in veterinary medicine to diagnose diseases of the brain, spine, and other organs. can be used to more precisely assess local tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. extent and detect smaller metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body.
Newer diagnostic approaches such as liquid biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions., in which circulating tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. DNADNA (deoxyribonucleic acid) is the molecule that carries the genetic instructions for the development, function, and reproduction of all known living organisms and many viruses. It is located in the cells of an organism and contains the information for heredity. is detected in the blood, are still in the research stage in veterinary oncologyOncology is the branch of medicine that deals with the diagnosis, treatment, and research of cancer. In veterinary medicine, this includes the treatment of cancers in animals. but could contribute to early detection of recurrence or therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. monitoring in the future.
Therapy
Surgical removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. with a margin of healthy tissue.
Radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. or chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. in cases where surgical removal is not possible, or in metastatic disease.
Follow-up care for early detection of recurrence or metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body..
The therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. of cutaneous adenocarcinoma in dogs is based on a multimodal approach, with surgical intervention remaining the most important treatment option. The choice of optimal therapeutic strategy depends on the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. stage, location, histological grade, and the patient’s general condition.
Surgical excision with wide safety margins (at least 2–3 cm laterally and one fascial layer in depth) is the first-line therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions.. The goal is complete removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. with tumor-free resection margins (R0 resection), as this offers the best prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop.. In cases of unfavorable location or large tumors, reconstructive surgical procedures such as local flap plasties or free skin grafts may be necessary to close the defect.
In cases of incomplete resection (R1 or R2 resection) or high-grade malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumors, adjuvant radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. is often recommended. Modern radiation techniques such as intensity-modulated radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. (IMRT) or stereotactic radiosurgery enable precise application of the radiation dose while sparing the surrounding healthy tissue. Radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. can also be considered as a primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. treatment option for inoperable tumors.
ChemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. plays a subordinate role in the treatment of cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinoma but can be used in metastatic disease or as adjuvant therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. after incomplete resection. Commonly used chemotherapeutic agents include doxorubicin, carboplatin, and cyclophosphamide. However, response rates are variable and often not long-lasting.
Newer therapeutic approaches include:
Electrochemotherapy, in which electrical impulses increase cell membrane permeability, leads to improved intracellular uptake of chemotherapeutic agents. This method has proven particularly effective for superficial tumors.
Targeted therapies that focus on specific molecular changes in tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells are gaining increasing importance. Tyrosine kinase inhibitors such as toceranib have shown promising results in some cases.
Immunotherapeutic approaches, including checkpoint inhibitors that activate the body’s own immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. to fight tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells, are currently being investigated in clinical trials and could expand the therapeutic arsenal in the future.
When making therapeutic decisions, the animal’s age, comorbidities, expected quality of life, and the owner’s financial resources must always be considered. An open discussion between veterinarian and owner about treatment options, prospects for success, and possible side effects is appropriate for informed decision-making.
Prognosis and follow-up care
The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. for dogs with cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinoma is variable and depends on several factors. The most important prognostic factors include the histological grade of the tumor, the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. stage at the time of diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., the completeness of surgical resection, and the presence of metastases.
With complete surgical removal (R0 resection) of a low- to moderately malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. adenocarcinoma without metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body., the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is comparatively favorable, with medianMedian refers to the midline or center of the body or an organ. In veterinary medicine, the term can be used to describe the location of a structure in relation to the center of the body. survival times of 12 to 24 months. High-grade malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumors, incomplete resections, or the presence of metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. are associated with a significantly poorer prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop., with medianMedian refers to the midline or center of the body or an organ. In veterinary medicine, the term can be used to describe the location of a structure in relation to the center of the body. survival time dropping to 6–12 months or less.
Molecular markers such as the expression of certain growth factor receptors or the proliferation rate (Ki-67 index) can provide additional prognostic information and are increasingly being incorporated into prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. assessment.
Follow-up care after treatment of adenocarcinoma is an essential component of the overall management and includes several components:
Regular clinical examinations are particularly important in the first two years after therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., as the risk of local recurrence and metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. is highest during this period. Monthly examinations are recommended in the first six months, after which the intervals can be extended to three to four months.
Follow-up examinations should include a thorough clinical examination with particular attention to the surgical site and regional lymph nodes. Imaging procedures such as chest X-rays and abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. are performed at regular intervals (every 3-6 months) to detect metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. early.
For dogs receiving chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. or targeted therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., regular blood tests are required to monitor possible side effects and adjust dosage.
Wound care after surgical procedures is an important aspect of follow-up care. Owners should be instructed on how to recognize signs of wound healingWound healing is the natural process of repairing tissue damage, occurring in phases including inflammation, tissue regeneration, and wound contraction, to restore tissue integrity. disorders or infections and when to seek veterinary help.
SupportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures to improve quality of life, such as adequate pain therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., adapted nutrition, and, if necessary, physiotherapeutic measures, should be integrated into the follow-up care concept.
Prevention
For preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinoma, early detection is crucial. Regular palpationPalpation is an examination method in which the condition of body tissues is assessed by feeling them with the hands. It is used to identify swelling, pain, or other abnormalities. of the dog, especially in older animals, enables early detection of suspicious lumps. Wounds or skin changes that do not heal within two weeks should be examined by a veterinarian. Excessive sun exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats., especially in dogs with light skin or thin coats, should be avoided. A balanced diet and an intact immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. contribute to skin health. Since genetic factors can play a role, careful breeding selectionSelection refers to the process of natural or artificial selection of specific individuals for reproduction, based on desired genetic traits. In breeding, this is applied to promote specific characteristics in dogs and cats. is important. The earlier a skin tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is detected, the greater the chances of successful treatment.
Outlook on current research
Research in the field of canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. cutaneous adenocarcinomas is continuously evolving and opening new perspectives for diagnostics and therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions.. Current research priorities include molecular characterization, innovative therapeutic approaches, and improved prognostic markers.
In the field of molecular oncologyOncology is the branch of medicine that deals with the diagnosis, treatment, and research of cancer. In veterinary medicine, this includes the treatment of cancers in animals., genetic and epigenetic changes in cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinomas are increasingly being identified. Through techniques such as next-generation sequencing and proteomics, specific mutations and altered signaling pathways can be characterized, representing potential targets for targeted therapies. The identification of driver mutations, similar to human adenocarcinoma, could enable the development of personalized therapeutic strategies.
A promising research area is immuno-oncology. The study of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. microenvironment and the interaction between tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells and the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. has led to the development of new immunotherapeutic approaches. Checkpoint inhibitors, already established in human medicine, are increasingly being evaluated in veterinary studies. Initial results show promising response rates for certain tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. entities, although efficacy in cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. adenocarcinomas still needs further investigation.
The development of minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. therapeutic procedures is another research focus. Techniques such as photodynamic therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., in which light-activated substances selectively destroy tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells, or high-frequency thermal ablation are being investigated for their applicability to superficial skin tumors.
In the field of diagnostics, advances in imaging diagnostics, such as high-resolution ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. procedures, functional MRI techniques, or PET-CT, enable more precise tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. characterization and stagingStaging is the process of determining the extent of a disease's spread, especially in cancer. It helps classify the severity of the condition and plan an appropriate treatment strategy.. Liquid biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions., in which circulating tumor DNADNA (deoxyribonucleic acid) is the molecule that carries the genetic instructions for the development, function, and reproduction of all known living organisms and many viruses. It is located in the cells of an organism and contains the information for heredity. or circulating tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells are detected in the blood, could in the future represent a minimally invasive method for tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. diagnostics, therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. monitoring, and recurrence detection.
Translational research approaches that transfer findings from human medicine to veterinary medicine are gaining increasing importance. Comparative oncologyOncology is the branch of medicine that deals with the diagnosis, treatment, and research of cancer. In veterinary medicine, this includes the treatment of cancers in animals. studies that examine similarities and differences between human and canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. tumors can contribute to a better understanding of tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. biology and the development of new therapeutic approaches.
The integration of artificial intelligence and machine learning into oncological diagnostics and treatment planning represents an innovative research approach. Algorithms for automated analysis of histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. images or for predicting response to therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. could support clinical decision-making in the future.