Kangri cancer is a type of

squamous-cell carcinoma Squamous-cell carcinoma (SCC), also known as epidermoid carcinoma, comprises a number of different types of cancer that begin in squamous cells. These cells form on the surface of the skin, on the lining of hollow organs in the body, and on the ...

of the

skin Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation. Other animal coverings, such as the arthropod exoskeleton, have different ...

. It is found only in

Kashmir Kashmir ( or ) is the Northwestern Indian subcontinent, northernmost geographical region of the Indian subcontinent. Until the mid-19th century, the term ''Kashmir'' denoted only the Kashmir Valley between the Great Himalayas and the Pir P ...

in the northwest of the

Indian subcontinent The Indian subcontinent is a physiographic region of Asia below the Himalayas which projects into the Indian Ocean between the Bay of Bengal to the east and the Arabian Sea to the west. It is now divided between Bangladesh, India, and Pakista ...

. It occurs on the lower

abdomen The abdomen (colloquially called the gut, belly, tummy, midriff, tucky, or stomach) is the front part of the torso between the thorax (chest) and pelvis in humans and in other vertebrates. The area occupied by the abdomen is called the abdominal ...

and inner

thigh In anatomy, the thigh is the area between the hip (pelvis) and the knee. Anatomically, it is part of the lower limb. The single bone in the thigh is called the femur. This bone is very thick and strong (due to the high proportion of bone tissu ...

s and is due to the use of a Kanger, a ceramic pot covered with wicker-work, carried as a source of warmth during cold weather. One of the earliest records of the condition was made in 1881 by surgeons at the Kashmir Mission Hospital and its cause was recognized in the early 20th century by Arthur Neve.Neve A (1900) Indian med. Gaz. 35, 81 Despite current knowledge of the cause of this condition, cases are still being reported. Other conditions associated with prolonged use of kangri in this fashion include

erythema ab igne EAI, also known as hot water bottle rash or toasted skin syndrome, is a Cutaneous condition, skin condition caused by long-term exposure to heat (infrared radiation). Prolonged thermal radiation exposure to the skin can lead to the development o ...

, a reticulate hypermelanosis with

erythema Erythema (, ) is redness of the skin or mucous membranes, caused by hyperemia (increased blood flow) in superficial capillaries. It occurs with any skin injury, infection, or inflammation. Examples of erythema not associated with pathology inc ...

Signs and symptoms

Most cases (80%) of

squamous cell carcinoma Squamous-cell carcinoma (SCC), also known as epidermoid carcinoma, comprises a number of different types of cancer that begin in squamous cells. These cells form on the surface of the skin, on the lining of hollow organs in the body, and on the ...

attributed to ultraviolet radiation present in areas of the skin that are usually more exposed to sunlight (e.g., head, face, neck). Although a particular form of squamous cell carcinoma, Kangri cancer is more often associated with the abdomen, thigh, and leg regions due to the usage and positioning of kangri pots, which come in close contact with these anatomical features. Over time, the use of kangri pots to keep warm results in

, a precancerous keratotic growth that "take the shape of superficial, serpiginous, reticular blackish brown colored lesions." Eventually, the cells at the lesion site become more irregular in shape and form; the lesions ulcerate and may become itchy and bloody. The resulting irregular growth is the presentation of kangri cancer.

Risk factors

Use of the kangri pot is the principal cause of kangri cancer. The pot holds hot wood and charcoal and is put in direct contact with the skin of the abdomen and the thigh areas as a way to keep warm during winter in northern India. Elements that are believed to contribute to the development of kangri cancer are heat, burning wood particles, smoke, soot, and tar of burnt chinar leaves. In one study, researchers found that kangri cancer patients had a history of using a kangri for 5–6 hours a day, 3–4 months a year.

Genetics

Beyond the behavioral risk factor of prolonged usage of kangri pots, researchers have begun to look at genetic mutations that may make some people more predisposed to develop kangri cancer. * In one study, people with kangri cancer were found to be approximately twice as likely as a control group to have a mutation in the

TP53 p53, also known as tumor protein p53, cellular tumor antigen p53 (UniProt name), or transformation-related protein 53 (TRP53) is a regulatory transcription factor protein that is often mutated in human cancers. The p53 proteins (originally thou ...

gene (codon 72 polymorphism). Patients with higher grade tumors exhibited more

proline Proline (symbol Pro or P) is an organic acid classed as a proteinogenic amino acid (used in the biosynthesis of proteins), although it does not contain the amino group but is rather a secondary amine. The secondary amine nitrogen is in the p ...

amino acid Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins. Only these 22 a ...

mutations at this site. * Another study confirmed the association of kangri Cancer and TP53, finding substitutions and insertions in 40% of the kangri cancer patients studied. The researchers observed a significant correlation with mutation status and age as well as with the presence of affected lymph nodes in patients. TP53 may, in the future, serve as "potential molecular marker and prognostic tool" for kangri cancer. Furthermore, PTEN mutations were found in two of thirty patients studied; though due to the small sample size, no useful conclusions could be postulated. * Two polymorphisms of the

HSP70 The 70 kilodalton heat shock proteins (Hsp70s or DnaK) are a family of conserved ubiquitously expressed heat shock proteins. Proteins with similar structure exist in virtually all living organisms and play crucial roles in the development of can ...

gene were discovered to be correlated with poor

prognosis Prognosis ( Greek: πρόγνωσις "fore-knowing, foreseeing"; : prognoses) is a medical term for predicting the likelihood or expected development of a disease, including whether the signs and symptoms will improve or worsen (and how quickly) ...

in cases of kangri cancer; the “Hsp70-2 A/G or G/G and Hsp70homC/C genotypes” could potentially be utilized to measure risk of kangri cancer development as well as to predict prognosis.

Treatment

Surgery

In the treatment of kangri cancer, surgery is, most often, the first-line course of action to remove the primary tumor.

Radiotherapy

External beam radiotherapy External beam radiation therapy (EBRT) is a form of radiotherapy that utilizes a high-energy collimated beam of ionizing radiation, from a source outside the body, to target and kill cancer cells. The radiotherapy beam is composed of particl ...

has been used in one person to prevent the relapse and growth of tumor metastases to the head and neck regions. The prophylactic applications of radiation have been noted as "encouraging" in this one case, reducing some tumors and eliminating others. Another study with a couple of the same authors found that radiotherapy after surgery helped with the reduction and cure of head and neck tumors in additional cases. The researchers suggest that external beam radiotherapy should be part of the treatment course for patients who have or at risk of developing tumors in the head and neck areas.

Prognosis

A research article from 1923 noted that the average

life expectancy Human life expectancy is a statistical measure of the estimate of the average remaining years of life at a given age. The most commonly used measure is ''life expectancy at birth'' (LEB, or in demographic notation ''e''0, where '' ...

of those with kangri cancer was about fifteen months, though there have been records of people dying within one year and living for more than twenty years with kangri cancer. Updated

is not found in more recent scientific publications. However, in 2013, it was noted that the progression from

was between one and two decades. It has been reported that about one-third to one-half of patients with kangri cancer show

metastasis Metastasis is a pathogenic agent's spreading from an initial or primary site to a different or secondary site within the host's body; the term is typically used when referring to metastasis by a cancerous tumor. The newly pathological sites, ...

to local

lymph nodes A lymph node, or lymph gland, is a kidney-shaped Organ (anatomy), organ of the lymphatic system and the adaptive immune system. A large number of lymph nodes are linked throughout the body by the lymphatic vessels. They are major sites of lymphoc ...

Epidemiology

The first case of kangri cancer was reportedly recognized in 1819. The incidence of kangri cancer is higher for those over age 50. There is no definitive predominance of kangri cancer in either males or females. Some studies may point to higher prevalence in males while others observed higher prevalence in females. In scientific literature, kangri cancer has only been attributed to the

Kashmir region Kashmir ( or ) is the northernmost geographical region of the Indian subcontinent. Until the mid-19th century, the term ''Kashmir'' denoted only the Kashmir Valley between the Great Himalayas and the Pir Panjal Range. The term has sinc ...

due to the traditional use of kangri pots. Kangri cancer is limited to this population, and thus, relatively little is known still, and there is much to be studied about the condition. In 2017, a local Kashmir media outlet, ''The Kashmir Reader,'' reported that researchers and health care providers are optimistic about the reduced incidence of kangri cancer, citing the rise of thermal clothing and electric heating sources that are now used in place of kangri pots to keep warm.

References

External links

'Kangri cancer' cases declining in Kashmir Valley (The Indian Express)
{{Radiation-related disorders Skin conditions resulting from physical factors Diseases and disorders in India