chemistry

Melphalan

Melphalan is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Melphalan rather than just read about it. In short: Melphalan, sold under the brand name Alkeran among others, is a chemotherapy medication used to treat multiple myeloma; malignant lymphoma; lymphoblastic and myeloblastic leukemia; childhood neuroblastoma; ovarian cancer; mammary adenocarcinoma; and uveal melanoma. It is taken by mouth or by injection into a vein.

Key takeaways

Melphalan belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Melphalan to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Melphalan from memory before moving on to harder problems.

Reference excerpt

Melphalan, sold under the brand name Alkeran among others, is a chemotherapy medication used to treat multiple myeloma; malignant lymphoma; lymphoblastic and myeloblastic leukemia; childhood neuroblastoma; ovarian cancer; mammary adenocarcinoma; and uveal melanoma. It is taken by mouth or by injection into a vein. Common side effects include nausea and bone marrow suppression. Other severe side effects may include anaphylaxis and the development of other cancers. Use during pregnancy may result in harm to the fetus. Melphalan belongs to the class of nitrogen mustard alkylating agents. It works by interfering with the creation of DNA and RNA. Melphalan was approved for medical use in the United States in 1964. It is on the World Health Organization's List of Essential Medicines. It is available as a generic medication.

Medical uses In the European Union, melphalan is indicated for the treatment of multiple myeloma; malignant lymphoma (Hodgkin, non-Hodgkin lymphoma); acute lymphoblastic and myeloblastic leukemia; childhood neuroblastoma; ovarian cancer; and mammary adenocarcinoma. In the United States, melphalan is used as a high-dose conditioning treatment prior to hematopoietic progenitor (stem) cell transplantation in people with multiple myeloma. In the European Union, it is indicated, in combination with other cytotoxic medicinal products, as reduced intensity conditioning treatment prior to allogeneic haematopoietic stem cell transplantation in malignant haematological diseases in adults. In August 2023, the US Food and Drug Administration approved melphalan (Hepzato) as a liver-directed treatment for adults with uveal melanoma with unresectable hepatic metastases affecting less than 50% of the liver and no extrahepatic disease, or extrahepatic disease limited to the bone, lymph nodes, subcutaneous tissues, or lung that is amenable to resection or radiation.

Side effects Common side effects include:

Nausea Bone marrow suppression, including Decreased white blood cell count causing increased risk of infection Decreased platelet count causing increased risk of bleeding Less common side effects include:

Severe allergic reactions Pulmonary fibrosis (scarring of lung tissue) including fatal outcomes (usually only with prolonged use) Hair loss Interstitial pneumonitis Rash Itching Irreversible bone marrow failure due to melphalan not being withdrawn early enough Cardiac arrest

Pharmacology

Pharmacokinetics Melphalan is transported into cancer cells by L-leucine-type transporters (LAT1 and LAT2). Metabolites of melphalan – mono- and dihydroxymelphalan – are pharmacologically inactive. They are created by a substitution of the chlorine atom with a hydroxyl group.

Mechanism of action The alkylation mechanism of melphalan is shared by all nitrogen mustards, proceeding through the formation of an aziridinium cation. This highly reactive intermediate interacts with nitrogen atoms in nucleotide bases, generating positively charged adducts. Melphalan chemically modifies DNA nucleotides through alkylation, primarily targeting guanine at the N7 position within the major groove, and to a lesser extent adenine at the N3 position within the minor groove.

Alkylation of guanine is the principal pharmacologically relevant event underlying melphalan’s therapeutic activity. This reaction produces crosslinks either between complementary DNA strands or within a single strand, typically involving guanine–guanine or adenine–adenine pairs. Such crosslinking disrupts DNA synthesis and RNA synthesis, processes essential for cell survival, leading to cytotoxicity in both dividing and non-dividing tumor cells.

Synthesis

4-Nitro-L-phenylalanine (1) was converted to its phthalimide by heating with phthalic anhydride, and this was converted to its ethyl ester (2). Catalytic hydrogenation produced the corresponding aniline. Heating in acid with oxirane, followed by treatment with phosphorus oxychloride provided the bischloride, and removal of the protecting groups by heating in hydrochloric acid gave melphalan (3).

Society and culture

Legal status On 17 September 2020, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) adopted a positive opinion, recommending the granting of a marketing authorization for melphalan. The applicant for this medicinal product is Adienne S.r.l. S.U. Melphalan was approved for medical use in the European Union in November 2020.

References

Illustrations

Worked examples

Example 1 — a first encounter with Melphalan

Start with the simplest possible case. Write down what Melphalan claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Melphalan before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Melphalan ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Melphalan

In research: Melphalan appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Melphalan in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Melphalan is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chloroethyl compounds, IARC Group 1 carcinogens, Nitrogen mustards, so understanding it makes those chapters shorter.
In everyday life: Look for Melphalan outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Melphalan in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Melphalan means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Melphalan out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Melphalan in simple terms?

Why does Melphalan matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Melphalan?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Melphalan.