What are the other Names for this Condition? (Also known as/Synonyms)
- Gastric Lymphoma
- Primary Gastric Lymphoma
What is Lymphoma of Stomach? (Definition/Background Information)
- Lymphoma of Stomach is an uncommon lymphoma that is mostly observed in older adults. It is also known as Gastric Lymphoma
- The condition may be primary (common) or secondary (uncommon):
- Primary Lymphoma of Stomach: This type of lymphoma first involves the stomach and later can involve other parts of the body including the lymph nodes and bone marrow
- Secondary Lymphoma of Stomach: This type of lymphoma involves other parts of the body first, such as peripheral blood, lymph nodes, bone marrow, and other organs; involvement of the stomach occurs later
- Lymphoma of Stomach can either be a B-cell lymphoma or a T-cell lymphoma. B-cell lymphomas are far more common than T-cell lymphomas
- There are various (histological) subtypes of Lymphoma of Stomach, some of which are listed below:
- MALT lymphoma of stomach (this subtype is more common): It is a low-grade (less aggressive) and slow-growing tumor
- Diffuse large B-cell lymphoma (DLBCL) of stomach: It is a high-grade (more aggressive) and rapid-growing tumor
- Together, the MALT and DLBCL subtypes, account for about 90% of all Gastric Lymphomas. Unlike other subtypes, the gastric MALT lymphoma is associated with gastritis (bacterial infection causing stomach inflammation)
- Lymphoma of Stomach may be associated with autoimmune disorders. It can cause abdominal pain, diarrhea, gastrointestinal tract bleeding, and swollen stomach. Other general signs and symptoms, such as fatigue, weight loss, and appetite may also be seen
- Chemotherapy, surgery, radiation therapy, and other treatment measures may be used for treating Lymphoma of Stomach based on the assessment of the physician
- The prognosis depends on many factors including the subtype and stage of lymphoma, progression of the condition, response to treatment, and overall health of the individual. In general, the prognosis of Lymphoma of Stomach is guarded
General information on lymphoma and lymphocytes:
- Lymphoma is a type of cancer stemming from uncontrollably dividing lymphocytes (type of white blood cells). There are two types of lymphomas:
- Hodgkin lymphoma
- Non-Hodgkin lymphoma
- Lymphocytes are the main white blood cells found in the lymph, which is the fluid of the lymphatic system; just as blood is the fluid of the circulatory system. Lymphocytes are made in bone marrow, and can develop into either B-cells or T-cells
- Lymph results from filtration of blood as it travels to and from tissues. Lymph is colorless because it lacks red blood cells; instead, it contains lymphocytes. It is central to the immune system
- There are 3 different kinds of lymphocytes:
- T-lymphocytes or T cells: They help combat infections and abnormalities within the cells (cell-mediated immunity). They fight viruses and cancerous cells
- B-lymphocytes or B cells: They produce antibodies that are bodily defense proteins, which target foreign invaders outside the cells (humoral immunity). They fight bacterial cells, cell fragments, and other immunogenic elements
- Natural killer cells or NK cells: They perform diverse functions related to both cell-mediated and humoral immunity. They also scout for cancer cells, a process called immune surveillance
Who gets Lymphoma of Stomach? (Age and Sex Distribution)
- Lymphoma of Stomach is an infrequent condition that generally affects older adults
- Both males and females can be affected
- It can occur worldwide and all races and ethnic groups may be affected
What are the Risk Factors for Lymphoma of Stomach? (Predisposing Factors)
No specific risk factors have been identified for Lymphoma of Stomach. However, the condition is known to be associated with the following factors:
- Autoimmune disorders
- Advanced age; older individuals commonly have a higher risk
- Individuals with weak immune system (due to various health conditions)
Besides the above, the following general factors may contribute towards lymphoma formation and development:
- Family history of immune disease
- The presence of any systemic disease
- Exposure to radiation and industrial chemicals
- Viruses (in some rare cases); Epstein-Barr virus infection
- X-ray, CT scan exposure
- Profession involving radiation exposure, which may include nuclear plant workers, pilots, astronauts, etc.
- Certain medications and drugs
International Prognostic Index: According to some scientists, the International Prognostic Index may not be very helpful in evaluating Lymphoma of Stomach. However, some scientists believe that it is helpful in some cases, to determine the prognosis.
The International Prognostic Index, for aggressive non-Hodgkin lymphoma, lists a few factors that determine the overall risk:
- Age over 60 years
- Elevated level of serum lactate dehydrogenase - LDH (a type of enzyme)
- Performance status, i.e. the overall health condition of the individual, which could range from being fully active (low risk) to being completely disabled (very high risk)
- Individual, who have already suffered from lymphoma, or other types of blood cancers, may have a relapse or a recurrence
- Presence of an immunodeficiency syndrome, like AIDS, is a high risk factor
- Those infected with Epstein-Barr virus are also prone to this lymphoma type
It is important to note that having a risk factor does not mean that one will get the condition. A risk factor increases ones chances of getting a condition compared to an individual without the risk factors. Some risk factors are more important than others.
Also, not having a risk factor does not mean that an individual will not get the condition. It is always important to discuss the effect of risk factors with your healthcare provider.
What are the Causes of Lymphoma of Stomach? (Etiology)
Lymphocytes are a type of white blood cells that are responsible for providing immunity in the human body. B-cells and T-cells are the two different types of lymphocytes. When under certain circumstances, the lymphocytes grow and multiply abnormally, it leads to a condition called as lymphoma, which is a most common type of cancer. There are 2 types of lymphoma:
- Hodgkin lymphoma
- Non-Hodgkin lymphoma
The cause of Lymphoma of Stomach is unknown. There may be certain genetic defects, such as translocation, which is a juxtaposition of regions of the chromosomes. This may result in:
- Change of regulatory elements of certain cancer-causing genes called as oncogenes, which can lead to increased production of their mRNA (overexpression), thus increasing their protein levels
- Exchange of protein coding regions of gene, giving rise to new proteins that can stimulate the inappropriate growth of cells
It is believed that the abnormal development of lymphocytes gives rise to cancerous cells leading to the formation of this condition. Nevertheless, how this occurs and the factors that cause it remain under investigation.
What are the Signs and Symptoms of Lymphoma of Stomach?
The signs and symptoms depend on whether it is a primary condition or a secondary condition. In a majority of primary lymphomas, if the tumor is small, it may be usually asymptomatic and the individuals will not have any significant symptoms. The symptoms also depend upon the extent of lymphoma involvement in other parts of the body.
The signs and symptoms of Lymphoma of Stomach may include:
- Abdominal pain and swelling
- Bloating and feeling of fullness
- Burning sensation in the stomach
- Constipation, diarrhea
- Stomach ulcer
- Gastrointestinal tract bleeding
- Vomiting (with blood sometimes), nausea
- Unintentional weight loss; changes in appetite
- High temperatures and excessive night sweats (may be recurrent)
- Fatigue and weakness, headache
- Anemia (low red blood cell count)
- Frequent infections
- Low blood pressure
In case the condition spreads from the stomach with the involvement of other organs, then the signs and symptoms may be based on specific organs that are affected.
How is Lymphoma of Stomach Diagnosed?
Lymphoma of Stomach diagnosis is generally performed by obtaining biopsy samples from the stomach/affected region and examining them under a microscope to detect the cancerous cells. There are other tests and procedures that could help in the diagnosis and these include:
- A thorough physical examination and a complete medical history, which is very important
- Blood tests that may include:
- Complete blood cell count (CBC) blood test
- Absolute lymphocyte count on peripheral blood
- Liver function blood test (LFT)
- Lactate dehydrogenase (LDH) blood test
- Tissue biopsy from the stomach:
- A biopsy of the tumor is performed and sent to a laboratory for a pathological examination. A pathologist examines the biopsy under a microscope. After putting together clinical findings, special studies on tissues (if needed) and with microscope findings, the pathologist arrives at a definitive diagnosis. Examination of the biopsy under a microscope by a pathologist is considered to be gold standard in arriving at a conclusive diagnosis
- Biopsy specimens are studied initially using Hematoxylin and Eosin staining. The pathologist then decides on additional studies depending on the clinical situation
- Sometimes, the pathologist may perform special studies, which may include immunohistochemical stains, molecular testing, flow cytometric analysis and very rarely, electron microscopic studies, to assist in the diagnosis
- Radiological imaging may be performed specific to location of the involved organ, and to determine the extent of lymphoma in the body including:
- X-ray of the stomach
- Ultrasound scan of the stomach/abdomen
- Computerized tomography (CT) scan of the stomach/abdomen
- Vascular radiological studies
- Whole body bone scan
- Whole body CT-PET scans to determine how far the lymphoma has spread, by checking the size and metabolic rate (a reflection of uncontrolled growth) of lymph nodes, throughout the body. This can also help determine, if the cancer has spread to other organ systems
- Brain MRIs are used if neurological symptoms are present, which can help determine if the cancer has spread to the brain, or to tissues that cover the brain
- Exploratory laparoscopy (diagnostic laparoscopy) may be required, if gastrointestinal symptoms are present. In this procedure, the abdomen is examined using a minimally-invasive technique, and a tissue biopsy and tissue for culture obtained. Minimally-invasive approaches help decrease complications and the length of stay at the hospital. A diagnostic laparoscopy is also helpful in staging of the tumor. Nevertheless, this procedure is not very much used
- Bone marrow aspiration and biopsy is performed and sent to a laboratory for a pathological examination, to determine if the bone marrow is involved. Sometimes, the pathologist may perform special studies, which may include immunohistochemical stains, histochemical stains, molecular testing, and very rarely electron microscopic studies. However, a bone marrow biopsy is not needed in the early stages of the condition
- Flow cytometry to identify cells as they flow through an instrument, called a flow cytometer. Flow cytometry measures the number and percentage of cells in a blood sample, and cell characteristics such as size, shape, and the presence of biomarkers on the cell surface. This method helps to sub-classify the condition and also to detect residual levels of disease after treatment. This tool can help in diagnosing relapse and restart treatment as needed
- Fluorescence in situ hybridization (FISH): It is a test performed on the blood or bone marrow cells to detect chromosome changes (cytogenetic analysis) in blood cancer cells. The test helps in identifying genetic abnormalities that may not be evident with an examination of cells under a microscope
- Immunophenotyping to identify a specific type of cell in a sample, which can help determine the best treatment course to be followed
- Polymerase chain reaction (PCR): It is used to measure the presence of certain biomarkers in blood or bone marrow cells. The test is ultrasensitive and detects extremely low amounts of biomarkers remaining in blood, which can be missed by cytogenetic methods, such as FISH, karyotype, or flow cytometry. PCR allows a more sensitive follow-up of patients in remission and can help determine whether additional treatment is necessary
Note: Differential diagnoses, to eliminate other tumor types are often considered, before arriving at a definitive diagnosis.
Many clinical conditions may have similar signs and symptoms. Your healthcare provider may perform additional tests to rule out other clinical conditions to arrive at a definitive diagnosis.
What are the possible Complications of Lymphoma of Stomach?
The complications due to Lymphoma of Stomach or Gastric Lymphoma may include:
- Involvement of local and distant organs: It can lead to systemic or disseminated disease in some cases
- Loss of function of the organ/area to which cancer has spread due to systemic involvement
- If the abdomen is affected, it can cause intestinal obstruction that results in urine outflow obstruction and kidney damage
- Weakened immune system (or immunosuppression) can be a complication, which can become more severe during treatment. Due to this, individuals are more vulnerable to infections; there is an increased risk of developing serious complications from such infections
- Occasionally, the tumor can transform into a more aggressive form or subtype of lymphoma
There may be complications related to chemotherapy used in treating the condition, which may include:
- Side effects such as dizziness, vomiting, appetite loss, mouth ulcers, and hair loss
- By damaging healthy cells, the individual is more open or vulnerable to secondary infections
- The treatment can also cause infertility in men and women. Hence, measures to protect the individual’s fertility must be considered, before starting chemotherapy
The treatment measures can also give rise to secondary cancers, such as skin cancer.
How is Lymphoma of Stomach Treated?
A combination of measures may be used to treat Lymphoma of Stomach. The treatment also depends upon the stage, overall health, age, and subtype of lymphoma.
- Chemotherapy: This approach uses a combination of drugs to kill the cancerous cells and can be used in patients, for all stages of the tumor
- There can be severe side effects including fatigue, nausea, hair loss, anemia, high risk of infection, and drug-specific reactions
- Many lymphomas can be resistant to chemotherapy. It can also damage healthy cells
- Chemotherapy can be administered as a pill, liquid, shot, or intravenously
Note: Men and women in child-bearing age would greatly benefit from counseling regarding fertility issues. Some chemotherapy agents can cause infertility in both men and women. There can be permanent damage to the testicles and ovaries, harming their ability to produce sperms or ova. In men, sperm banking can be considered before initiating therapy. In women, in many cases, due to urgency of starting chemotherapy, it is often difficult to perform ovum banking. However, if there is sufficient time prior to chemotherapy, ovum banking may be performed. The healthcare provider may help assess the risk-benefit analysis, depending upon each individual’s specific circumstances.
- Surgical removal of the lymphoma from the stomach
- Radiation: Radiation therapy is the use of high-energy radiation waves to kill cancer cells, by destroying their DNA
- This treatment modality is generally used for early stage lymphomas. It is most commonly used in combination with chemotherapy
- The radiation may be administered by a machine placed outside the body, or by placing a radioactive material inside the body
- The side effects of radiation therapy include nausea, vomiting, fatigue, pain, risk of cancer later in life, and risk of heart disease
- Radiation can damage healthy cells in addition to cancer cells, causing further complications
- Supportive treatment: Steroids, blood transfusions, anti-nausea medications, and antibiotics, may be used as supportive therapy. In combination with other treatment measures, these can help combat the symptoms of immunodeficiency
- Undertaking treatment of underlying conditions/disorders, as warranted
- If Gastric Lymphoma is not fully responsive to treatment, or if the chance of recurrence is high, then bone marrow transplantation or stem cell transplantation can be considered
- In order to prevent infections because the immune system is weakened by the lymphoma or by its treatment, the patient is kept in an isolated ward and treated with appropriate antibiotics
- Nowadays targeted therapies are being developed that can selectively kill the cancer cells. Many of them are in the stage of clinical trials
- Clinical trials: There may be some newer treatment options, currently on clinical trials, which can be considered for some patients depending on their respective risk factors
Your healthcare provider will determine the best course of treatment depending on your individual circumstances. Also, follow-up care with regular screening and check-ups are important post-treatment.
How can Lymphoma of Stomach be Prevented?
Currently, it is not possible to prevent Lymphoma of Stomach. However, controlling certain factors may help lower one’s risk for the condition.
- Healthy diet and exercise, as well as avoidance of unnecessary exposure to chemicals, may help decrease its risk
- Avoiding smoking
- Undertaking appropriate and early treatment of autoimmune disorders, if any
- Using appropriate protective gear while working with x-rays and other radioactive source
- In order to avoid a relapse, or be prepared for a recurrence, the entire diagnosis, treatment process, drugs administered, etc. should be well-documented and follow-up measures initiated
Regular medical screening at periodic intervals with blood tests, scans, and physical examinations, are mandatory. Often several years of active vigilance are crucial and necessary.
What is the Prognosis of Lymphoma of Stomach? (Outcomes/Resolutions)
- Lymphoma of Stomach is a slow-growing malignancy with a generally good prognosis with early diagnosis and treatment
- The prognosis is mainly dependent upon the tumor stage and lymphoma subtype. Also, primary lymphomas have better prognoses than secondary or recurrent lymphomas
- In general, the prognosis depends upon a set of several factors, which include:
- Stage of tumor: With lower-stage tumors, when the tumor is confined to site of origin, the prognosis is usually excellent with appropriate therapy. In higher-stage tumors, such as tumors with metastasis, the prognosis is poor
- Overall health of the individual: Individuals with overall excellent health have better prognosis compared with those with poor health
- Age of the individual: Older individuals generally have poorer prognosis than younger individuals
- The size of the tumor: Individuals with small-sized tumors fare better than those with large-sized tumors
- Individuals with bulky disease have a poorer prognosis
- Involvement of vital organs may complicate the condition
- The surgical respectability of the tumor (meaning, if the tumor can be removed completely) - it is a rare option
- Whether the tumor is occurring for the first time, or is a recurrent tumor. Recurring tumors have worse prognosis compared to tumors that do not recur
- Response to treatment: Tumors that respond to treatment have better prognosis compared to tumors that do not respond to treatment
- Progression of the condition makes the outcome worse (progressive Gastric Lymphoma)
- The combination chemotherapy drugs used, may have some severe side effects (such as cardio-toxicity). This chiefly impacts the elderly adults, or those who are already affected by other medical conditions. Tolerance to the chemotherapy sessions is a positive influencing factor
- Progression to bone marrow failure is usually associated with short survival
Additional and Relevant Useful Information for Lymphoma of Stomach:
- Treatment for Lymphoma of Stomach can cause physical and emotional distress; supportive care and encouragement, help positively and can bring a measure of relief to the patients
The following article link will help you understand leukemia and lymphoma (blood cancer):