Cucurbitacins as Anticancer Agents: A Patent Review.

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Cucurbitacins are tetracyclic triterpenoids with diverse biological activities.
• Natural sources have yielded numerous cucurbitacins, with synthetic efforts focused on enhancing cytotoxic effects.

Purpose of the Study:

• This review analyzes patents from the past decade concerning the therapeutic applications of natural cucurbitacins and their synthetic analogs.
• Focus is placed on cancer-related patents and Structure-Activity Relationships (SAR) to underscore the significance of these compounds.

Main Methods:

• Patent data was systematically collected from publicly accessible online patent databases.

Main Results:

• Cucurbitacins, particularly types B and D, exhibit significant cytotoxic properties against various cancer cell lines.
• Chemical modifications, especially at C(2)-OH and C(25)-OH groups, led to enhanced cytotoxic activity, with acyl esters and ether derivatives showing notable potency.

Conclusions:

• Natural and semi-synthetic cucurbitacins are promising candidates for novel anticancer drugs.
• Conjugation with other anticancer agents can yield synergistic effects, and future research should explore homodimers, heterodimers, and halo derivatives.
• Patent analysis indicates cucurbitacins hold potential for developing broad-spectrum cancer treatment regimens.