Cancer Questions in English

(C) Cancer is characterized by the uncontrolled,abnormal division of cells,which leads to the formation of a mass of cells called a tumor. Unlike normal cells,cancer cells do not exhibit contact inhibition,allowing them to grow indefinitely and invade surrounding tissues. It is a non-infectious disease and can be fatal if it spreads to vital organs (metastasis).

(D) $X$-rays are a type of ionizing radiation. When $X$-rays interact with biological tissues,they cause damage to the $DNA$ structure by inducing mutations. These mutations can lead to the transformation of normal cells into cancerous cells. Agents that cause cancer are known as carcinogens. Therefore,$X$-rays act as physical carcinogens by damaging $DNA$ and inducing oncogenic transformation.

(C) Cancer is classified based on the tissue of origin.
$1$. $Carcinoma$: This is the most common type of cancer, arising from epithelial tissues (e.g., skin, lining of organs).
$2$. $Sarcoma$: Cancer arising from connective tissues (e.g., bone, cartilage, fat).
$3$. $Leukemia$: Cancer of blood-forming tissues (e.g., bone marrow) leading to an overproduction of abnormal white blood cells.
$4$. $Melanoma$: $A$ specific type of cancer arising from melanocytes (pigment-producing cells).
Therefore, cancer of epithelial cells is known as $Carcinoma$.

(A AND C) Cancer treatment involves several approaches to eliminate or control the growth of malignant cells.
$1$. Surgery: Surgical removal of the tumor is often the first line of treatment to physically excise the cancerous tissue.
$2$. Chemotherapy: Anticancer drugs are used to kill rapidly dividing cancer cells throughout the body.
$3$. Radiotherapy and Immunotherapy are also common methods.
Antibacterial drugs are ineffective against cancer as they target bacteria,not malignant human cells. Therefore,options $A$ and $C$ are correct methods,making 'All of the above' an incorrect choice as a whole. Given the standard context of such questions,the most appropriate answer is that both surgery and anticancer drugs are used.

(C) Cancer is classified based on the tissue of origin.
$1$. Carcinoma: Cancer of epithelial tissues (ectoderm or endoderm).
$2$. Sarcoma: Cancer of connective tissues,bones,cartilage,and muscles,which are derived from the mesoderm.
$3$. Leukemia: Cancer of blood-forming tissues leading to an abnormal increase in white blood cells.
Therefore,sarcoma involves malignant growth in tissues derived from the mesoderm.

(D) Cancer is characterized by the uncontrolled and abnormal division of cells in specific body tissues,which leads to the formation of a mass of cells called a tumor.
It is a non-infectious disease,meaning it does not spread from one person to another through contact or pathogens.
Therefore,the correct statement is that cancer is a non-infectious disease caused by the uncontrolled growth of specific body tissues.

(A) In histopathological studies,a piece of the suspected tissue is cut into thin sections,stained,and examined under a microscope by a pathologist. This procedure is known as a $Biopsy$. It is the most definitive method for diagnosing cancer,as it allows for the direct observation of cellular abnormalities.

(A) Cancer is classified based on the tissue of origin.
$1$. $Sarcoma$ is a type of cancer that arises from connective tissues, including muscles, bones, cartilage, fat, and blood vessels.
$2$. $Carcinoma$ arises from epithelial tissues (skin, lining of organs).
$3$. $Leukemia$ is a cancer of blood-forming tissues (bone marrow).
$4$. $Melanoma$ is a cancer of the pigment-producing cells (melanocytes) in the skin.
Therefore, cancer of the muscles is classified as $Sarcoma$.

(B) Normal cells possess genes called $Proto-oncogenes$ (or $c-onc$).
Under certain conditions,these $Proto-oncogenes$ get activated and transform into $Oncogenes$,which lead to the oncogenic transformation of the cells,causing them to become cancerous.
$Viral$ $oncogenes$ $(v-onc)$ are genes carried by oncogenic viruses that can also cause cancer,but the question specifically refers to the transformation of normal cellular genes.

(C) Tobacco smoke contains various harmful substances,including polycyclic aromatic hydrocarbons,nitrosamines,and other toxic compounds. These substances are classified as $Chemical$ carcinogens because they induce mutations in the $DNA$ of cells,leading to uncontrolled cell division and cancer. Therefore,tobacco smoke is a well-known source of $Chemical$ carcinogens.

(B) Cancer is classified based on the tissue of origin.
$1$. Carcinoma: Cancer arising from epithelial tissues (e.g.,skin,lining of organs).
$2$. Sarcoma: Cancer arising from connective tissues,which include bone,cartilage,fat,muscle,and blood vessels. Therefore,cancer of the cartilage is a type of sarcoma.
$3$. Melanoma: Cancer of the melanocytes (pigment-producing cells).
$4$. Leukemia: Cancer of the blood-forming tissues (bone marrow),leading to an overproduction of abnormal white blood cells.
Thus,the correct option is $B$.

(C) Melanoma is a type of cancer that develops from the pigment-producing cells known as melanocytes. It is the most serious type of skin cancer and occurs when these cells grow uncontrollably,often due to damage from ultraviolet $(UV)$ radiation.

(C) Agents that cause cancer are known as carcinogens.
These agents can be physical,chemical,or biological in nature.
Examples include ionizing radiations (like $X-$rays and gamma rays),non-ionizing radiations (like $UV$ rays),and various chemical substances like those found in tobacco smoke.
Oncogenes are genes that have the potential to cause cancer when mutated or expressed at high levels,but they are not the agents themselves.

(A) Cancer is classified based on the tissue of origin.
$1$. Carcinoma refers to cancer of epithelial tissues.
$2$. Sarcoma refers to cancer of connective tissues,such as bone (osteosarcoma) and cartilage (chondrosarcoma).
$3$. Lymphoma refers to cancer of the lymphatic system.
$4$. Therefore,calling cancer of bone or cartilage 'carcinoma' is incorrect,as these are classified as 'sarcoma'.
$5$. Among the given options,'Carcinoma of bone' is scientifically incorrect because bone cancer is a type of sarcoma.

(B) Cancer diagnosis involves techniques like histopathological studies (biopsy),radiographic methods ($X$-ray,$CT$ scan,$MRI$),and various laboratory tests (blood and bone marrow tests). The $Widal$ test is a serological test used specifically for the diagnosis of $Typhoid$ fever,caused by $Salmonella$ $typhi$. Therefore,it is not used for cancer diagnosis.

(D) Ionizing radiations like $X$-rays and $\gamma$-rays,and non-ionizing radiations like $UV$-rays,are known as physical carcinogens.
These radiations cause damage to the $DNA$ of cells.
If the repair mechanisms of the cell fail to fix this damage,it leads to mutations.
These mutations can cause the uncontrolled division of cells,resulting in neoplastic transformation (cancer).

(C) Ionizing radiations are high-energy radiations that have enough energy to remove tightly bound electrons from the orbit of an atom,causing ionization.
$X$-rays and $\gamma$-rays are well-known examples of ionizing radiations that can cause $DNA$ damage and lead to neoplastic transformation (cancer).
$UV$-rays and $IR$-rays are classified as non-ionizing radiations,although $UV$-rays can still cause biological damage.
Therefore,$(i)$ $X$-rays and $(iii)$ $\gamma$-rays are ionizing radiations.

(C) In cancer,tumors are broadly classified into $2$ types based on their growth and spread characteristics:
$1$. Benign tumors: These remain confined to their original location and do not spread to other parts of the body.
$2$. Malignant tumors: These are a mass of proliferating cells called neoplastic or tumor cells. These cells grow very rapidly,invading and damaging the surrounding normal tissues. As these cells actively divide and grow,they also starve the normal cells by competing for vital nutrients. Cells sloughed from such tumors reach distant sites through the blood,and wherever they get lodged in the body,they start a new tumor there. This property called metastasis is the most fearful property of malignant tumors.

(A) Melanoma is a type of cancer that develops from the pigment-containing cells known as melanocytes.
Since melanocytes are derived from the ectoderm and are epithelial in origin,cancers arising from epithelial tissues are classified as carcinomas.
Therefore,melanoma is considered a type of carcinoma.

(D) Ionizing radiations like $X$-rays and Gamma rays,and non-ionizing radiations like Ultraviolet $(UV)$ rays,cause $DNA$ damage.
These radiations can lead to neoplastic transformation of cells,which is a primary cause of cancer.
Therefore,the genetic material $DNA$ is sensitive to all these types of radiations.

(A) The treatment of cancer involves various methods such as surgery,radiation therapy,chemotherapy (using anti-cancer drugs),and immunotherapy.
$A$. Cancer-specific antigens are molecules used for the detection or diagnosis of cancer,not a method of treatment.
$B$. Radiation therapy uses high-energy radiation to kill cancer cells.
$C$. Immunotherapy involves using substances to stimulate or suppress the immune system to help the body fight cancer.
$D$. Anti-cancer drugs (chemotherapy) are used to kill rapidly dividing cancer cells.
Therefore,cancer-specific antigens are diagnostic tools,not a treatment modality.

(A) Pap smear (Papanicolaou test) is a screening procedure used to detect potentially precancerous or cancerous processes in the cervix (the opening of the uterus).
During the procedure,cells are gently scraped from the cervix and examined under a microscope to identify any abnormal changes.
This test is crucial for the early detection of cervical cancer.

(C) Cancer is classified based on the tissue of origin.
$1$. $Carcinoma$ arises from epithelial tissues, which line the internal and external surfaces of the body, including the stomach lining.
$2$. $Sarcoma$ arises from connective tissues like bone, cartilage, or muscle.
$3$. $Leukemia$ is a cancer of blood-forming tissues like bone marrow.
$4$. $Lymphoma$ is a cancer of the lymphatic system.
Since the stomach is lined by epithelial cells, cancer of the stomach is typically a $Carcinoma$ (specifically, adenocarcinoma).

(B) Anticancer drugs are designed to kill rapidly dividing cancer cells. However,they are not selective and also affect healthy cells that divide rapidly,such as hair follicle cells and bone marrow cells.
$(ii)$ Hair loss (alopecia) occurs because hair follicle cells are damaged.
$(iii)$ Decrease in white blood cell count (leukopenia) occurs because bone marrow,which produces blood cells,is affected.
$(iv)$ Anemia is also a common side effect due to the suppression of red blood cell production in the bone marrow.
While $(ii)$,$(iii)$,and $(iv)$ are all side effects,the most common clinical grouping provided in standard textbooks for chemotherapy side effects includes hair loss and bone marrow suppression (leading to low $WBC$ and anemia). Given the options,$(ii)$ and $(iii)$ represent the classic side effects of chemotherapy.

(B) Carcinoma is a type of cancer that starts in cells that make up the skin or the tissue lining organs,such as the liver or kidneys.
These are epithelial cells.
Sarcoma is the term used for malignant tumors of connective tissue.
Therefore,carcinoma is an abnormal growth of skin or mucous membrane.

(A) In normal cells,there are genes known as $c-onc$ or proto-oncogenes. These genes are present in an inactive state. Under certain conditions,such as physical,chemical,or biological agents,these proto-oncogenes get activated and are transformed into oncogenes,which lead to the oncogenic transformation of the cell,causing cancer.

(D) $Interferons$ are a group of signaling proteins made and released by host cells in response to the presence of several viruses. They are a type of cytokine. $Interferons$ help in the immune response by activating natural killer cells and macrophages,which can destroy cancer cells. They are often used in biological response modifier therapy to treat certain types of cancer.

(A) Leukemia is a type of cancer that affects the blood and bone marrow.
It is characterized by the uncontrolled proliferation of abnormal white blood cells (leukocytes) in the body.
Because these abnormal cells crowd out healthy blood cells,it is commonly referred to as blood cancer.

(C) Tobacco smoke contains various chemical carcinogens,such as polycyclic aromatic hydrocarbons and nitrosamines.
These substances are well-documented to cause damage to the $DNA$ of cells in the respiratory tract.
Chronic exposure to these carcinogens leads to the uncontrolled division of cells,which results in lung cancer.
Therefore,tobacco smoke is the primary cause of lung cancer.

(A) Assertion $A$ is true because interferons are biological response modifiers that can activate the immune system to fight cancer cells.
Reason $R$ is true because interferons are proteins secreted by virus-infected cells that protect non-infected cells from further viral infection.
However,the mechanism by which interferons treat cancer (immunotherapy) is distinct from their mechanism of protecting cells from viral infection.
Therefore,$R$ is not the correct explanation for $A$.

(A) Viruses that have genes called viral oncogenes,which can cause the transformation of normal cells into cancerous cells,are known as oncogenic viruses. These viruses carry genetic material that disrupts the normal cell cycle and promotes uncontrolled cell division.

(D) Cancer diagnosis involves various techniques.
$1$. Biopsy and histopathological studies are the most definitive tests.
$2$. Radiography ($X$-ray),$CT$ scan,and $MRI$ are imaging techniques.
$3$. Laboratory tests include the detection of cancer-specific antigens or markers in the blood.
$4$. Among the given options,'Cancer specific antigen' refers to a laboratory blood test used to detect tumor markers,whereas Pap smear,Mammography,and Barium test are screening or imaging procedures.

(D) Leukemia is a type of cancer that affects the blood and bone marrow. It is characterized by the uncontrolled proliferation of white blood cells (leukocytes). Since the bone marrow is the primary site for the production of blood cells,including white blood cells,leukemia originates in the bone marrow.

(B) Cellular oncogenes (c-onc) or proto-oncogenes are normal genes present in all normal cells.
When these genes are activated under certain conditions (such as mutations or viral infections),they can lead to oncogenic transformation of the cells,resulting in cancer.
Therefore,they are considered responsible for cancer when activated.

(A) Leukemia is a type of cancer of the blood or bone marrow characterized by an abnormal increase in the number of white blood cells $(WBCs)$.
Carcinoma refers to cancer arising from epithelial tissues.
Sarcoma refers to cancer arising from connective tissues.
Anemia is a condition characterized by a deficiency of red blood cells or hemoglobin,not a type of cancer.

(B) Leukemia is a type of cancer of the blood or bone marrow characterized by an abnormal increase in the number of immature white blood cells $(WBCs)$ in the body.
Sarcoma is a cancer that arises from transformed cells of mesenchymal origin (e.g.,bone,cartilage,fat,muscle).
Carcinoma is a cancer that begins in the skin or in tissues that line or cover internal organs.
Pneumonia is an infection that inflames the air sacs in one or both lungs,not a type of cancer.

(C) Cancer is broadly classified into three main types based on the tissue of origin:
$1$. Carcinomas: These arise from epithelial tissues (e.g.,skin,lining of organs).
$2$. Sarcomas: These arise from connective tissues (e.g.,bone,cartilage,fat,muscle).
$3$. Leukemias and Lymphomas: These arise from blood-forming tissues and the immune system.
Therefore,there are $3$ main types of cancer.

(C) Leukemia is a type of cancer that affects the blood and bone marrow. It is characterized by the uncontrolled production of abnormal white blood cells. Hemolysis refers to the destruction of red blood cells,Hemophilia is a genetic bleeding disorder,and Thalassemia is an inherited blood disorder characterized by less hemoglobin and fewer red blood cells in the body.

(D) Carcinoma is a type of cancer that develops from epithelial cells.
$A$,$B$,and $C$ (Pancreatic,Lung,and Breast cancer) are all examples of carcinomas because they originate in epithelial tissues.
$D$ (Lymphoma) is a cancer of the lymphatic system,which arises from lymphocytes (a type of white blood cell) and is classified as a sarcoma or specifically as a lymphoma,not a carcinoma.

(D) Cancer of the spleen is typically classified as a lymphoma because the spleen is a lymphoid organ. Lymphomas are cancers that originate in the lymphatic system,specifically in the lymphocytes. Since the spleen is a secondary lymphoid organ,malignancies arising here are generally lymphomas. Among the given options,none specifically list 'Lymphoma',therefore the correct choice is $D$.

(D) The transformation of normal cells into cancerous cells is known as carcinogenesis. This process is induced by various agents:
$1$. Physical agents: Ionizing radiations like $X$-rays and gamma rays,and non-ionizing radiations like $UV$ rays cause $DNA$ damage,leading to neoplastic transformation.
$2$. Chemical agents: Carcinogens present in tobacco smoke are major causes of lung cancer.
$3$. Biological agents: Oncogenic viruses contain viral oncogenes that can transform normal cells into cancerous cells.
Since physical,chemical,and biological agents can all induce cancer,the correct option is $D$.

(D) Pap smear (Papanicolaou test) is a screening procedure used to detect potentially precancerous and cancerous processes in the cervix. It falls under the category of laboratory diagnostic methods,as it involves the microscopic examination of cells collected from the cervix to identify abnormalities. Therefore,it is a type of laboratory diagnostic technique.

(A) Techniques like $Radiography$ $(X-ray)$,$CT$ $(Computed Tomography)$,and $MRI$ $(Magnetic Resonance Imaging)$ are very useful to detect cancers of the internal organs.
$CT$ uses $X-rays$ to generate a three-dimensional image of the internals of an object.
$MRI$ uses strong magnetic fields and non-ionizing radiations to accurately detect pathological and physiological changes in the living tissue.
Therefore,$MRI$ is a standard technique used for the detection of cancers of internal organs.

(B) Cancer is a non-infectious disease caused by the uncontrolled division of cells.
Option $A$ is correct because metastasis involves the spread of cancer cells to other parts of the body via blood or lymph.
Option $B$ is incorrect because cancer is a non-infectious disease; it does not spread from one person to another through contact or pathogens.
Option $C$ is correct as tumors (neoplasms) are masses of cells often surrounded by connective tissue.
Option $D$ is correct as the hallmark of cancer is the loss of contact inhibition,leading to uncontrolled cell division.

(B) Non-ionizing radiations like $UV$-rays cause damage to $DNA$ by forming pyrimidine dimers,which leads to mutations. These mutations can disrupt the normal cell cycle control,potentially transforming normal cells into neoplastic (cancerous) cells. In contrast,$X$-rays,$\gamma$-rays,and $\alpha$-rays are ionizing radiations.

(C) Cancer is characterized by uncontrolled cell division,which can lead to the formation of tumors.
Oncogenic viruses are known to cause cancer in humans and animals.
Agents that cause cancer are indeed called carcinogens (e.g.,chemicals,radiation,viruses).
However,stating that cancer is an 'incurable disease' is incorrect.
With modern medical advancements such as surgery,chemotherapy,radiation therapy,and immunotherapy,many types of cancer can be treated and cured,especially if detected at an early stage.

(C) Leukemia is a type of cancer that originates in the bone marrow,which is the site of blood cell production. It is characterized by an abnormal increase in the number of white blood cells $(WBCs)$ in the blood.
$1$. Carcinoma refers to cancer of epithelial tissues.
$2$. Sarcoma refers to cancer of connective tissues.
$3$. Leukemia is cancer of blood-forming tissues.
$4$. Melanoma is cancer of melanocytes in the skin.

$A$ tumor that is surrounded by connective tissue and remains confined to a single location is known as a $Benign$ $tumor$.
$Benign$ tumors do not spread to other parts of the body (they do not metastasize).
In contrast, $Malignant$ tumors are characterized by their ability to invade surrounding tissues and spread to distant sites through the blood or lymphatic system, a process known as $metastasis$.

(A) The correct answer is $A$ (Anemia).
$Sarcoma$, $Leukemia$, and $Carcinoma$ are all types of $Cancer$ (malignant tumors).
$Sarcoma$ is cancer of connective tissue.
$Leukemia$ is cancer of blood-forming tissues.
$Carcinoma$ is cancer of epithelial tissue.
$Anemia$ is a condition characterized by a deficiency of red blood cells or hemoglobin in the blood, which is not a type of cancer.

(B) Metastasis is a hallmark of malignant tumors. It is the process by which cancer cells break away from the original (primary) tumor,travel through the blood or lymphatic system,and form new tumors (metastatic tumors) in other parts of the body. This property distinguishes malignant tumors from benign tumors.