Cancerina

Cancerina (Semialarium mexicanum / Hippocratea excelsa): A Comprehensive Reference

1. Identity: Botanical Names, Taxonomy, and Natural Source

Cancerina is the widely used common name for a woody climbing vine or shrub belonging to the family Celastraceae. Its currently accepted botanical name is Semialarium mexicanum (Miers) Mennega, a combination that was formally established by Mennega in 1988. The plant is also known by several synonyms, including Hemiangium excelsum (Kunth) A.C.Sm., Hippocratea excelsa Kunth, and Hippocratea mexicana Miers. Much of the published scientific literature — particularly older studies — refers to it under the name Hippocratea excelsa or the related species Hippocratea celastroides, both of which share the common name cancerina and are used interchangeably in Mexican traditional medicine and commerce.

Hippocratea celastroides Kunth is a shrub-like vine that is widely distributed throughout Mexico and grows in tropical deciduous forests. Its popular names in Mexico include "cancerina," "barajilla," "barajita," "bejuco de piojo," "cucaracho," "hierba del piojo," and "ixcate." In rural Mexico this plant is also known as "mata piojo" (louse killer), reflecting the traditional recognition of its pesticidal properties by farmers and ranchers.

A related species, Hippocratea celastroides Kunth, is also sold under the name cancerina in Mexican herbal markets and has been the subject of separate pharmacological investigations (see sections below). Both species belong to the Celastraceae family and share similar phytochemical profiles, including the quinonemethide triterpene chemotaxonomic markers characteristic of that family. An HPLC-based study confirmed the presence of Semialarium mexicanum (Miers) Mennega — known as cancerina — alongside other Celastraceae species, and the chromatographic profile analysis of all four analyzed species showed three similar signals corresponding to the main chemotaxonomic markers of the Celastraceae family: quinonemethide triterpenes.

Across Mesoamerica, the plant is known by numerous vernacular names, including "cancerina," "chilonché," "matapiojo," "oreja de mico" in Guatemala; "guaracaco" and "matapiojo" in Honduras; "cancerina" and "matapiojo cucaracho" in El Salvador; and "guacharo" in Costa Rica, among others.

Mexico is considered one of the world's most important reservoirs of medicinal plant diversity, with more than 4,000 plant species with documented medicinal use reported, of which at least 300 are traditionally employed to treat conditions associated with inflammation, tumors, "lumps," cancer-like disorders, and hematological or reproductive diseases. Semialarium mexicanum (syn. Hippocratea excelsa) is among the genera widely used in Mexican traditional medicine for the treatment of inflammatory disorders, infections, gastrointestinal ailments, and conditions associated with abnormal cell growth.

2. Natural Source, Plant Description, and Parts Used

Cancerina is a woody climbing vine native to Mexico and parts of Central America. The plant (Hippocratea excelsa HBK, syn. Hemiangium excelsum HBK) is a liana native to México and Central America. It inhabits tropical deciduous forests, typically in lowland scrubland and dry tropical woodland habitats across its range in Mexico, Guatemala, Honduras, El Salvador, Nicaragua, and Costa Rica.

The medicinally active plant material is concentrated in specific organs. The root bark of this plant, known as "Cancerina," is used in Mexican traditional medicine for treating peptic ulcers, skin ailments, kidney disease, and menstruation disorders. Cancerina (Hippocratea excelsa) is a medicinal plant native to Mexico and Central America. Its name derives from its popular use as a support for problems related to tumors and injuries. Its bark and leaves concentrate bioactive compounds, such as tannins and flavonoids, which give it anti-inflammatory, healing, antioxidant, and digestive properties.

3. Common Preparations and Dosage Forms

Cancerina is available and used in multiple forms, both in traditional and commercial contexts:

• Herbal tea (infusion/decoction): In folk practices, it is often prepared as a tea, tincture, or topical wash to cleanse the body from within and accelerate healing of external wounds or rashes. A traditional decoction preparation involves simmering 1 teaspoon of dried bark in 2 cups of water for 10–15 minutes, straining, and consuming the resulting liquid.
• Tincture (liquid extract): Commercial liquid extracts of cancerina bark are available, reflecting the Mexican herbal tradition. Products in this category celebrate Mexican herbalism and the power of Mexico's native botanicals.
• Whole dried bark: Preparations include infusion of boiled bark or dried leaves to prepare a medicinal tea; topical use as washes or poultices for wounds and injuries; and natural extract available in capsules or tinctures for more convenient consumption.
• Topical wash/compress: The bark decoction is used externally on the skin as an antimicrobial and astringent wash for wounds, ulcers, and skin rashes.

In some regions, cancerina is used by midwives and traditional healers for menstrual irregularities or uterine inflammation, typically taken in small, measured doses as part of herbal combinations with ruda or manzanilla, under guidance from experienced practitioners.

4. Traditional and Historical Use

4.1 Geographic and Cultural Context

For centuries, cancerina (Hippocratea excelsa) has been one of Mexico's most respected healing plants, valued for its powerful ability to support skin health, stomach wellness, and internal cleansing. Deeply rooted in Indigenous and rural Mexican traditions, cancerina continues to bridge ancient wisdom and modern herbal therapy.

In Indigenous Mexican communities, cancerina is known as a "plant of purification." It symbolizes inner cleansing and resilience — both physical and spiritual. Used in temazcales (sweat lodges) or ritual baths, it is believed to draw out negativity and renew vitality.

4.2 Traditional Therapeutic Applications

The bark of the stems and roots of the Hippocratea excelsa plant, commonly known in the central part of Mexico as "cancerina," has been used to treat various diseases including gastric ulcers, kidney diseases, skin conditions, uterine infections, as an anti-inflammatory, as a healing agent, and for the treatment of dysentery.

In Mexican Traditional Medicine, cancerina (Hippocratea celastroides) is used for the treatment of gastric and intestinal infections, systemic and skin inflammation, injuries, and gastritis.

The bark of Semialarium mexicanum, commonly known as "Cancerina," is used as an infusion in Central America and Mexico to treat various wound infections, as well as skin and vaginal ulcers.

In Mexican herbal medicine, cancerina has been used as a support in cases of cancer due to its purifying and regenerative properties. This popular use — which is the source of the plant's common name — has not been validated by controlled clinical trials (see Section 6).

"Cancerina" is applied to the root bark of this plant and is usually used for inflammatory conditions, peptic ulcers, kidney disease, skin ailments, cancer, and menstruation disorders.

5. Key Constituents and Active Compounds

5.1 Triterpenes

Triterpenes — particularly quinonemethide triterpenes and pentacyclic triterpenes of the oleanane and ursane skeletal types — are the principal and most pharmacologically studied constituents of cancerina. Two new triterpenoids, 21β-hydroxyolean-12-en-3-one and a seco-dinor derivative of pristimerine named dzununcanone, were isolated from the root bark of Hippocratea excelsa.

Three compounds isolated from Semialarium mexicanum were characterised by nuclear magnetic resonance and mass spectrometry and identified as (3β)-3-Hydroxy-urs-12-en-28-oic acid, (3β)-Urs-12-ene-3,28-diol, and (2α, 19α)-2,19-Dihydroxy-3-oxo-urs-12-en-28-oic acid. These are all ursane-type pentacyclic triterpenes.

Pristimerin is a quinonemethide triterpenoid of particular pharmacological interest isolated from cancerina. Pristimerin was identified in cytotoxic fractions of S. mexicanum root bark and may be partially responsible for the cytotoxic effect observed in breast cancer cell assays. Pristimerin has been shown to inhibit DNA synthesis and trigger apoptosis in human HL-60 cells (promyelocytic leukemia cell line), and to inhibit topoisomerase II without influencing topoisomerase I.

The triterpenoid pristimerin and a mixture of sesquiterpene evoninoate alkaloids — isolated from the hexane and methanol extracts of H. excelsa, respectively — strongly reduced insect feeding capacity. Other triterpenoids (friedelin, β-sitosterol, canophyllol) were also isolated from the hexane extract.

5.2 Phytosterols and Flavonoids

Fractionation of the methanol extract of H. excelsa root bark led to active fractions from which sitosterol-3-O-β-glucoside, β-sitosterol, and (−)-epicatechin were isolated. These compounds showed important gastroprotective activity (93.4%, 85.7%, and 72.1% of gastroprotection, respectively), which exceeded bismuth subsalicylate, the positive control, at 46.2%.

A mixture of α-amyrin and β-amyrin showed 50% gastroprotection, while friedelin, canophyllal, and canophyllol were isolated from the active fractions but were inactive as gastroprotective compounds.

5.3 Alkaloids

Sesquiterpene evoninoate alkaloids have been isolated from the methanol extract of H. excelsa roots, demonstrating antifeedant activity against grain pests. The Celastraceae family more broadly is associated with pyridine-derived alkaloids, and related species such as Maytenus laevis have been documented to contain alkaloids alongside their triterpene constituents.

5.4 GC–MS Profiling

GC–MS analysis of the hexane extract of Semialarium mexicanum suggested the presence of triterpenoid-related and other lipophilic compounds potentially associated with cytotoxic activity.

5.5 HPLC Fingerprinting

A simple HPLC method was developed for the identification and comparison of quinonemethide triterpenes in wild Hippocratea excelsa and commercial "cancerina" to establish the chromatographic profile of these compounds in root bark. The method used a gradient system with a reversed-phase C18 column using proportions of water, methanol, and tetrahydrofuran as mobile phases to separate signals at 254 and 420 nm. The chromatograms exhibited good resolution and precision. This fingerprinting work was important for establishing authentication methods, since commercial cancerina products may contain material from related but distinct species.

6. Scientific Evidence by Area of Use

6.1 Gastroprotection and Antiulcer Activity

Preclinical (animal) evidence — moderate for this category.

The aqueous and ethanol extracts of the root bark of Hippocratea excelsa, locally known as "Cancerina," showed an important gastroprotective effect in several experimental ulcer models in rats. Fractionation of the methanol extract led to four pools of active fractions.

Sitosterol-3-O-β-glucoside, β-sitosterol, and (−)-epicatechin were isolated from the active fractions and showed important gastroprotective activity (93.4%, 85.7%, and 72.1% of gastroprotection, respectively), whereas bismuth subsalicylate (used as positive control) showed 46.2% of gastroprotection. A mixture of α-amyrin and β-amyrin showed 50% gastroprotection.

Friedelin, canophyllal, and canophyllol were isolated from the active fractions, but they were inactive as gastroprotective compounds. These results provide additional support for the popular use of this plant as an antiulcer remedy in Mexican traditional medicine.

A proposed mechanism of gastroprotection involves the stimulation of prostaglandin synthesis: Reduction of the ulcer index of lesions induced by several ulcerogenic substances has been attributed to activation of cyclooxygenase enzyme, subsequent stimulation of prostaglandin synthesis, and increasing bicarbonate levels.

Evidence strength: Preliminary preclinical (animal model) only. No human clinical trials on gastroprotective endpoints have been published for cancerina.

6.2 Anti-Helicobacter pylori Activity

Preclinical and veterinary evidence — very preliminary.

The aim of a published research study was to assess the anti-Helicobacter pylori activities of hydro-ethanolic root-bark extracts from Hippocratea celastroides Kunth in naturally infected dogs, after testing their acute and subacute toxicities in mice.

The methanol extract exhibited in vitro anti-H. pylori activity and registered a minimum inhibitory concentration (MIC) value of 7.8 μg/mL.

The root-bark of H. celastroides produced no signs of toxicity, and manifested pharmacological activity that indicated the possibility of an alternative treatment for H. pylori infection. Effectiveness is still low and it is necessary to continue research.

Evidence strength: Preclinical in vitro and animal/veterinary studies only. The observed effectiveness was considered low by the investigators themselves. No human clinical data exist.

6.3 Cytotoxic and Anticancer Activity

Preclinical (cell line) evidence — preliminary but reproducible across multiple studies.

The root bark of Semialarium mexicanum (cancerina) is traditionally used in Mexico to treat cancer. However, there are no studies supporting its use clinically. Researchers evaluated whether S. mexicanum root bark induces cytotoxicity in breast cancer cells to determine if it has potential applications in the treatment of this disease.

Extracts of S. mexicanum root bark in petroleum ether, ethanol, and water were obtained by ultrasound-assisted extraction. MTT and WST-1 assays were used to evaluate cytotoxicity toward breast cancer cells (MDA-MB-231 and MCF7), non-tumorigenic breast-derived cells (MCF 10A), and peripheral blood mononuclear cells (PBMCs). For the extract with greatest cytotoxicity, induction of apoptosis and oxidative stress were determined using flow cytometry. The extract was fractionated, and the cytotoxicity of its fractions was evaluated.

Only the petroleum ether extract was cytotoxic for all cell types (MDA-MB-231 > MCF 10A/MCF7 > PBMCs). Cell death occurred by apoptosis, which could be associated with the induction of oxidative stress. Two fractions that were highly cytotoxic for breast cancer cells were obtained (IC₅₀ ≤ 4.15 µg/mL for the most active fraction at 72 hours). MCF 10A cells were less affected, while PBMCs were not affected after 72 hours of treatment. Pristimerin was identified in both fractions and may be partially responsible for the cytotoxic effect. These results suggest that S. mexicanum root bark has a potential application in breast cancer treatment.

A 2026 study evaluated the selectivity of cancerina extracts across a broader panel of human cancer cell lines. Hexane, acetone, and methanolic extracts from Semialarium mexicanum, Eryngium heterophyllum, Piper auritum, and Cochlospermum vitifolium were evaluated in a panel of human cancer cell lines and non-tumoral models, including primary human uterine fibroblasts (HUFs). Cytotoxicity was assessed after 48 hours of treatment using increasing extract concentrations, and selectivity indices were calculated.

The hexane extract of Semialarium mexicanum showed the highest cytotoxic potency and selectivity toward cervical cancer cells, with IC₅₀ values of 15.9 ± 1.8 µg/mL and 17.2 ± 2.8 µg/mL in HeLa and SiHa cells, respectively, and selectivity index (SI) values greater than 5 when compared with primary human uterine fibroblasts.

Cell cycle analysis revealed an increased sub-G1 population, and nuclear morphology assays demonstrated chromatin condensation and fragmentation in cancer cells, supporting an antiproliferative mechanism.

The root extract of a closely related cancerina species showed cytotoxic activity against nasopharyngeal (KB) and breast (MCF-7) cancer cell lines, but non-toxic selectivity toward a normal fibroblast cell line (HFS-30).

Evidence strength: All anticancer data are from in vitro cell-line assays. There are no animal tumor models and no human clinical trials. The body of evidence, while consistent across multiple independent laboratories, remains preliminary and cannot be used to infer any clinical benefit.

6.4 Wound Healing, Anti-Inflammatory, and Anti-Melanogenic Activity

Preclinical (cell-based) evidence — well-characterized mechanistically for the isolated triterpenes.

A 2022 study published in the Journal of Ethnopharmacology (Apaza Ticona et al.) specifically investigated the wound healing, anti-inflammatory, and anti-melanogenic activities of the aqueous extract of S. mexicanum. Three ursane-type triterpenes were isolated from Semialarium mexicanum. All compounds showed proliferative capacity in the RAW 264.7, NIH/3T3, and B16-F10 cell lines. The extract of Semialarium mexicanum had wound healing, anti-inflammatory, and anti-melanogenic activities.

The anti-melanogenic activity of the isolated compounds was evaluated by the inhibition of tyrosinase and melanin in the B16-F10 cell line. The three compounds showed anti-melanogenic activity; however, compound 3 — (2α, 19α)-2,19-Dihydroxy-3-oxo-urs-12-en-28-oic acid — was the most active with an IC₅₀ of 8.03 μM for inhibition of tyrosinase production and an IC₅₀ of 8.53 μM for inhibition of melanin production. Regarding wound healing activity, the three compounds presented proliferative activity in all tested cell lines, with compound 3 showing higher cell proliferation percentages (88.89–89.60%) compared to compounds 1 and 2 (64.92–65.71% and 71.53–71.99%, respectively).

The anti-inflammatory activity of these pentacyclic triterpenoids is produced by reversible Michael addition reactions with exposed nucleophilic groups (such as accessible cysteine sulphides) of various signaling proteins. The presence of an oxo group in C-3 and a hydroxy group in C-1 in compound 3 gives it higher pharmacological potential than compounds 1 and 2.

Evidence strength: In vitro cell-line studies only. The mechanistic characterization is detailed, but efficacy in animal wound models and in human skin has not been established in peer-reviewed publications.

6.5 Anti-Inflammatory Activity (General)

The ethanol extract of H. excelsa has been shown to exert anti-inflammatory activity in prior experimental studies. The mechanisms underlying anti-inflammatory effects appear to be related to the triterpenoid content, particularly the ability of quinonemethide and ursane-type triterpenes to modulate inflammatory signaling pathways.

6.6 Insecticidal / Antiparasitic Activity

Both Hippocratea excelsa and Hippocratea celastroides have therapeutic and insecticidal applications in Mexican traditional medicine. The toxicity of H. excelsa root cortex has been previously demonstrated against the stored grain pest Sitophilus zeamais. All H. excelsa extracts showed high antifeedant activity and elicited moderate mortality. The triterpenoid pristimerin and a mixture of sesquiterpene evoninoate alkaloids strongly reduced insect feeding capacity. Other triterpenoids including friedelin, β-sitosterol, and canophyllol isolated from the hexane extract were innocuous or showed no statistically significant activity.

7. Body Systems and Health Areas Associated with Cancerina

• Gastrointestinal system: Gastroprotection, antiulcer effect (peptic ulcers, gastritis), anti-Helicobacter pylori activity, digestive complaints, dysentery.
• Integumentary system (skin): Wound healing, wound infection treatment, skin ulcers, vaginal ulcers, antimicrobial/astringent skin washes, and potential anti-melanogenic (skin-lightening) effects via tyrosinase inhibition.
• Immune and inflammatory systems: General anti-inflammatory activity, systemic inflammation.
• Oncology-adjacent (traditional use only; no clinical evidence): The plant is traditionally associated with "cancer," giving rise to its common name; cytotoxic activity has been confirmed in cancer cell lines in vitro but has not translated to clinical evidence.
• Renal/urinary system: Used traditionally for kidney disease and to promote urine production.
• Female reproductive system: Used traditionally for menstrual irregularities and uterine inflammation.
• Respiratory system: Traditionally associated with respiratory support in some regional traditions.

8. Dosage Forms and Dosages Reported in Sources

No standardized or clinically validated dosage has been established for cancerina. The dosages below are drawn directly from sources as cited.

8.1 Traditional/Folk Dosages

• Bark decoction (tea): 1 teaspoon of dried cancerina bark in 2 cups of water, brought to a gentle boil and simmered for 10–15 minutes, strained, and consumed as ½ cup twice daily for up to 7 days, then paused.
• Topical wash: 2 tablespoons of cancerina bark boiled in 2 cups of water for 15 minutes, cooled, and used as a wash or compress for skin irritations, rashes, or blemishes.

8.2 Toxicological Dosages Used in Preclinical Studies (Not for Human Use)

• In preclinical toxicity evaluation of Hippocratea celastroides hydro-ethanolic root-bark extract in Balb-C mice: acute toxicity was assessed with oral doses ranging from 2,000 to 5,000 mg/kg; for the subacute study, doses from 200 to 2,000 mg/kg body weight were administered for 42 days.
• In acute toxicity studies using the Lorke procedure in mice, Hippocratea excelsa was among the most toxic plants tested, with LD₅₀ values between 1,085 and 2 mg/kg.

9. Notable Safety Considerations

9.1 Acute Toxicity

Significant preclinical toxicity data exist for cancerina species. In acute toxicity studies performed according to the Lorke procedure in mice — evaluating a range of Mexican medicinal herbs including Hippocratea excelsa — H. excelsa was among the most toxic of the plants tested, with LD₅₀ values between 1,085 and 2 mg/kg. This range represents the most important preclinical safety signal for cancerina root bark extracts and indicates that the raw extract possesses meaningful acute toxicity at high doses in rodent models.

By contrast, the closely related species Hippocratea celastroides was found to have a considerably different acute toxicity profile in a separate study: the root bark of H. celastroides produced no signs of toxicity at tested doses, but effectiveness against H. pylori was still considered low and further research was noted as necessary.

9.2 Pesticidal and Insecticidal Properties

The plant has well-recognized insecticidal and pesticidal properties, which have been traditionally leveraged against stored grain pests. The toxicity of H. excelsa root cortex has been previously demonstrated against Sitophilus zeamais. These properties, shared across multiple biologically active fractions, underscore the pharmacological potency of the plant's constituents.

9.3 Pregnancy and Lactation

Traditional sources consistently caution against the use of cancerina during pregnancy and lactation. Commercial product labeling for cancerina specifies a contraindication during pregnancy and lactation. Given the traditional use of the plant to affect menstruation and uterine function, and the absence of safety data for pregnancy, this caution appears pharmacologically well-grounded.

9.4 Species Identification and Adulteration

The common name "cancerina" is applied to at least two botanically distinct Celastraceae species (Semialarium mexicanum / Hippocratea excelsa and Hippocratea celastroides) and, according to some retail product labeling, to Calluna vulgaris (common heather, a European plant from a completely different botanical family). An HPLC fingerprinting method was specifically developed to compare quinonemethide triterpene profiles between wild Hippocratea excelsa and commercial "cancerina" products to establish authentic chromatographic profiles. This points to a recognized adulteration or mislabeling problem in the commercial cancerina trade, which has direct safety implications.

9.5 Absence of Human Clinical Safety Data

It is important to note that more scientific research is needed to confirm the potential benefits and safety of cancerina. No pharmacokinetic studies, drug interaction studies, or controlled clinical safety trials have been conducted in humans for any cancerina species. All safety data are from rodent models and no formal toxicology package applicable to humans has been published. The insecticidal and cytotoxic properties of the plant's principal active compounds — particularly pristimerin — highlight the need for careful evaluation before therapeutic use.

10. Regulatory and Monograph Status

As of the time of writing, cancerina (Semialarium mexicanum, Hippocratea excelsa, or Hippocratea celastroides) does not have an official monograph from the European Medicines Agency (EMA), European Scientific Cooperative on Phytotherapy (ESCOP), World Health Organization (WHO), German Commission E, or the United States Pharmacopeia (USP). It is not listed in the NIH Office of Dietary Supplements (ODS) fact sheets. It is sold in the United States as a dietary supplement (herbal tea, tincture, or dried herb), which does not require premarket approval by the Food and Drug Administration, though such products carry the disclaimer that their claims have not been evaluated by the FDA.

References

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• Apaza Ticona L, Slowing K, Serban AM, Humanes Bastante M, Hernáiz MJ. Wound healing, anti-inflammatory and anti-melanogenic activities of ursane-type triterpenes from Semialarium mexicanum (Miers) Mennega. J Ethnopharmacol. 2022;289:115009. PMID: 35077827.
• Hinojosa-Escobedo WI, Quiroz-Martínez MA, et al. Preclinical evaluation of anti-Helicobacter spp. activity of Hippocratea celastroides Kunth and its acute and sub-acute toxicity. BMC Complement Med Ther. 2016;16(1):421. PMC5101718.
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