clinicaltrials_download: Downloads detailed information about clinical trials satisfying a query

Description

Given a query, or a dataframe containing trial identifiers, downloads detailed study information from clinicaltrials.gov. Optionally includes results of completed trials. The URL search is limited to 2000 characters, and count restricted searches are done by NCT ID, which are 11 characters long. Therefore, the effective maximum count allowed is roughly 100. If count is greater than 100, then the first 100 trials will be returned, with a warning. To return all results, use a query string and set count to NULL.

Usage

clinicaltrials_download(query = NULL, tframe = NULL, count = 20, include_results = FALSE, include_textblocks = FALSE)

Arguments

query

Search pattern as a string; a vector of key-value pairs is interpreted as an advanced search and is therefore combined with '&'

tframe

Data frame containing trial identifiers, as returned by clinicaltrials_search

count

Limit the results to a specified integer. Set to NULL to include all results.

include_results

Logical. Include results of completed trials

include_textblocks

Logical. Include lengthy text descriptions and eligibility criteria.

Value

A list of data.frames.

Examples

Run this code

# trials satisfying 'heart disease AND stroke AND California'
## Not run: clinicaltrials_download(query = 'heart disease AND stroke AND California', count = 5)

# advanced search for open, interventional trials involving melanoma
## Not run: clinicaltrials_download(query = c('recr=Open', 'type=Intr', 'cond=melanoma'))

# can also use a named list
## Not run: clinicaltrials_download(query = list(recr='Open', type='Intr', cond='melanoma'))

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