The phrase "a portion of cases" is correct and usable in written English.
It can be used when referring to a subset or a specific number of cases within a larger group or category.
Example: "In the study, a portion of cases were found to have similar symptoms, indicating a possible common cause."
Alternatives: "a segment of cases" or "a subset of cases".
But a lead author of the Nature study, John Collinge, said in an interview with Nature that a portion of cases are inherited from one's parents, and an even smaller percentage are acquired from consuming infected tissue.
Furthermore, since the clause you have is of questionable legality for authors in many countries, it would only be a successful strategy for a portion of cases in which you sought to use it.
In several human cancers, such as MM, the Hh signaling pathway may be active in only a portion of cases [6], [23].
If an intervention is focused only on a portion of cases or if disease-induced deaths occur in non-negligible order, not only the variance but also the formulae for the final size relation (our equation (1)) have to be reassessed [58] [60].
Nevertheless, these strategies, even used optimally, are likely to prevent only a portion of cases of LD.
44 In about half of patients, however, psychiatric disorders presented earlier than AA, and in a portion of cases, stressful events were recalled preceding hair loss.
Examination of the unlinked ANZPIC data revealed 66 cases which had been admitted to PICU with the code 'spinal cord lesion' and it is postulated that a portion of these cases could be transverse myelitis or ADEM cases.
A portion of MND cases has genetic causes; however, the majority of MND cases are sporadic and of unknown aetiology.
It is A.D.H.D. — not hyperactivity, which is present in only a portion of A.D.H.D. cases.
In addition, Mr. de Blasio plans to introduce legislation to the City Council to require the agency to develop a panel of outside experts to review a portion of the cases.
This entity likely represents a portion of the cases of right upper quadrant abdominal pain in the setting of CHF previously attributed to hepatic capsular distention.
